Article
Computer Science, Interdisciplinary Applications
Xiaoqiang Li, Dechun Lu, Qingtao Lin, Xiaoqiang Dong, Xiuli Du
Summary: A hydro-mechanical constitutive model is proposed to describe the hydraulic and mechanical behavior of unsaturated soils. The model uses Bishop's effective stress and the effective degree of saturation as constitutive variables, and includes a loading-collapse yield curve and a non-orthogonal plastic flow rule. A simple water retention model is also developed. The model is validated through numerical examples and can capture the behavior of unsaturated soils.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Hassan Sabetamal, Daichao Sheng, John P. Carter
Summary: This paper presents a coupled hydro-mechanical modelling approach for unsaturated soil problems using advanced numerical and constitutive models in Abaqus. Two different strategies for interpreting unsaturated soil behaviour are considered, with relevant constitutive models implemented through user-defined subroutines. The algorithms are validated through benchmark problems and applied to simulate challenging unsaturated geomechanics problems, demonstrating the utility of the implemented procedures. Mesh optimization is also incorporated to handle finite deformations.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Engineering, Mechanical
Dat G. Phan, Giang D. Nguyen, Ha H. Bui, Terry Bennett
Summary: The proposed thermodynamics-based approach presents a coupling method for modeling the hydro-mechanical response of partially saturated soils, reducing model complexity by decreasing the number of parameters and identifying/calibrating all model parameters from standard tests.
INTERNATIONAL JOURNAL OF PLASTICITY
(2021)
Article
Engineering, Geological
G. M. Rotisciani, A. Desideri, A. Amorosi
Summary: The paper introduces a new single-surface elasto-plastic model for unsaturated cemented soils, focusing on the mechanical instabilities induced by plastic strain accumulation and changes in pore saturation. The constitutive equations are used to simulate geotechnical testing conditions and analyze results, proposing a stability criterion for failure conditions. The crucial role of state variables and model parameters on potential failure conditions is highlighted and validated against numerical results.
Article
Computer Science, Interdisciplinary Applications
Yi Liu, Guoqing Cai, Annan Zhou, Bowen Han, Jian Li, Chengang Zhao
Summary: This work introduces a fully coupled constitutive model for the thermo-hydro-mechanical behavior of unsaturated soils, which considers key features of unsaturated soils and is validated against experimental data. The model is shown to exhibit basic properties and performance through a numerical example.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Computer Science, Interdisciplinary Applications
Tuan A. Pham, Gabriela M. Medero, Melis Sutman
Summary: This paper presents a thermohydro-mechanical coupled model of the elastic modulus characteristic curve (EMCC) based on the effective stress theories of unsaturated soils. The proposed model uses the soil-water characteristic curve (SWCC) and the modulus of elasticity under saturated conditions to predict the variation of modulus of elasticity with matric suction for unsaturated soils. The successful prediction performance of the proposed model is demonstrated by comparing measured and predicted outcomes for various published data sets related to different soil types.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Mahnoosh Biglari, Iman Ashayeri, Domenico Gallipoli, Sara Moradpour
Summary: This model proposed in the paper calculates the small-strain shear stiffness of saturated and unsaturated fine-grained soils through the introduction of a reference saturated state and functions of key parameters. It simplifies the calibration process and shows good predictive capabilities in laboratory experiments.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Engineering, Geological
Shun Wang, Wei Wu, Deshan Cui
Summary: The mechanical behavior of clastic soil was described by numerical simulations considering both the soil matrix and breccia. The simulations indicated that breccia content, gradation, and overconsolidation ratio significantly influenced the strength, deformation, and failure pattern of clastic soil.
Article
Computer Science, Interdisciplinary Applications
Ke Chen, Xuzhen He, Fayun Liang, Daichao Sheng
Summary: Estimating capillary pressure's contribution to effective stress is essential for studying mechanical and hydraulic behavior of unsaturated soils. Based on experiments, we find that degree of saturation (Sr) is a better variable than matric suction (s) for modeling Bishop's effective stress parameter (chi). We introduce wet area fraction as an alternative to chi, considering the influence of hydraulic hysteresis and pore size distribution on shear strength through the soil water retention curve (SWRC). This model requires soil material parameters in the reference state and can predict strength characteristics in different mechanical or hydraulic states.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Computer Science, Interdisciplinary Applications
T. Ligursky, Z. Michalec
Summary: This paper investigates the thermodynamic consistency of the Barcelona Basic Model and its coupling with a hydraulic model. A framework for poroelastoplasticity using net stress and suction as stress variables is developed and applied to derive a consistent hydro-mechanical coupling for the Barcelona Basic Model. The resulting restrictions on hydraulic behavior are found to be too strict and not completely physically acceptable. It is concluded that caution should be exercised in developing and utilizing poromechanical models using net stress and suction as stress variables with respect to their thermodynamic consistency, and different types of models should be employed for coupled hydro-mechanical modeling.
COMPUTERS & STRUCTURES
(2023)
Article
Computer Science, Interdisciplinary Applications
Zhiqiang Lin, Jiangu Qian, Zhenhao Shi
Summary: This study introduces a novel model to estimate the shear strength of expansive soils. Experimental results show a linear relationship between capillary suction stress and shear strength, but the friction angle contributed to shear strength is different from the internal friction angle of saturated soils.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Engineering, Mechanical
Dat G. Phan, Giang D. Nguyen, Ha H. Bui, Terry Bennett
Summary: Constant suction triaxial tests reveal the effect of hydro-mechanical coupling on the onset and orientation of localisation bands in partially saturated soils. A model with a single yield surface dependent on stress and suction is used to investigate this effect. The model parameters are determined using experimental bifurcation characteristics, highlighting the sensitivity of conditions that promote bifurcation under the influence of hydro-mechanical coupling and dilation.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Engineering, Geological
Zhiqiang Lin, Jiangu Qian, Zhenhao Shi, Qian Zhai
Summary: This study examines the uniqueness of strength parameters for coarse- and fine-grained unsaturated soils with bimodal soil-water retention curves (SWRCs) using the suction stress concept. The results show that both types of soils exhibit a bilinear strength envelope in the suction stress-shear strength plane, which differs from unsaturated soils with unimodal SWRC.
ENGINEERING GEOLOGY
(2022)
Review
Engineering, Geological
Xiuhan Yang, Sai K. Vanapalli
Summary: This paper summarizes studies on the strain-softening behavior of unsaturated soils published in the literature over the past three decades. The studies are categorized into mechanical characteristics and micromechanisms, prediction models for shear strength, and numerical methods for modeling strain-softening behavior. The influence of soil-water characteristic curve and time effects on strain-softening behavior are also discussed. The comprehensive details provided in this paper are valuable for the analysis and design of geostructures in unsaturated soils undergoing large shear deformation.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2023)
Article
Engineering, Geological
Qingyi Mu, Longlong Meng, Zhao Lu, Limin Zhang
Summary: Understanding the hydromechanical behavior of unsaturated intact paleosol and intact loess is crucial for addressing geohazards in regions with loess-paleosol sequences. While loess has been extensively studied, paleosol has been relatively neglected. This study investigates the water retention, compression, and collapse behaviors of intact paleosol and loess, with loess serving as a benchmark. The results show similar air entry value and degree of hysteresis in water retention curves for both soils, despite the differences in void ratio, clay fraction, and particle arrangement. Furthermore, the intact paleosol exhibits a smaller structure permitted space and lower maximum collapse potential than the intact loess due to the differences in particle contacts and skeleton stability.
ENGINEERING GEOLOGY
(2023)
Article
Engineering, Environmental
Jidong Teng, Yu Zhong, Sheng Zhang, Daichao Sheng
Summary: The soil freezing characteristic curve (SFCC) is crucial for understanding the hydrothermal migration, frost heaving, and constitutive relations of frozen soil. A new SFCC model was proposed based on the adsorption and capillary action between soil particles and the ice interface, which showed a good agreement with experimental results. The model provides a clear physical interpretation and theoretical basis for understanding the phase change process in frozen soils.
COLD REGIONS SCIENCE AND TECHNOLOGY
(2021)
Review
Engineering, Geological
Sheng Zhang, Feng Gao, Xuzhen He, Qilei Chen, Daichao Sheng
Summary: The study investigates the migration of particles in porous media under cyclic loading, highlighting the impact of loading frequency and load magnitude on particle migration rates, as well as the influence of train speed and axle loads on mud pumping hazard.
Article
Construction & Building Technology
Zhiyu Luo, Wengui Li, Yixiang Gan, Xuzhen He, Arnaud Castel, Daichao Sheng
Summary: The addition of nano-SiO2 and nano-TiO2 particles in fly ash-based geopolymers improved compressive strength and micro mechanical properties of N-A-S-H gels. Nano-SiO2 had a greater impact on macro-strength, while nano-TiO2 significantly enhanced gel micro-mechanical properties. Both nanoparticles showed a positive effect on the early reaction rate of geopolymers.
CEMENT & CONCRETE COMPOSITES
(2021)
Article
Engineering, Civil
Jidong Teng, Han Yan, Sihao Liang, Sheng Zhang, Daichao Sheng
Summary: The study developed a new hydraulic conductivity model for frozen soils based on the Kozeny-Carman equation, which can be used to explain the migration of water and heat in frozen soils compared to unfrozen soils. Parametric analysis revealed that unfrozen water saturation and shape coefficient ratio are important parameters affecting hydraulic conductivity. The proposed model can also be simplified to a power function for easy use.
JOURNAL OF HYDROLOGY
(2021)
Article
Materials Science, Composites
Wenkui Dong, Wengui Li, Kirk Vessalas, Xuzhen He, Zhihui Sun, Daichao Sheng
Summary: Smart cement-based sensors with graphene nanoplate (GNP) have been studied for structural health monitoring under aggressive environments like sulphuric acid attacks. The results showed that after acid immersion, the surface deterioration and mass loss increased, compressive strength decreased significantly, but intact GNP/cementitious composites still exhibited linear and repeatable piezoresistivity, showing great potential for SHM. The changes in resistivity under different loads were explained by the development of conductive passages in the composites.
COMPOSITES COMMUNICATIONS
(2021)
Article
Construction & Building Technology
Wenkui Dong, Wengui Li, Xinqun Zhu, Daichao Sheng, Surendra P. Shah
Summary: Multifunctional cementitious composites with integrated self-sensing and hydrophobicity capacities were developed and investigated using conductive graphene nanoplate (GNP) and silicone hydrophobic powder (SHP). The highest compressive and flexural strengths were achieved with 1% SHP and 2% GNP, while water absorption decreased significantly with SHP content. The water contact angle initially increased and then decreased with the dosages of GNP and SHP.
CEMENT & CONCRETE COMPOSITES
(2021)
Article
Engineering, Geological
Chen-Xi Tong, Ming-Yue Zhai, Hai-Chao Li, Sheng Zhang, Daichao Sheng
Summary: This paper summarizes the latest advances in studying the effects of soil particle breakage on soil mechanics properties and relevant constitutive models. By quantifying particle size distribution and the evolution of particle breakage, a new critical state model treating PSD as a variable is proposed. The model is validated against experimental data and compared with other constitutive models, showing satisfactory performance.
Article
Engineering, Geological
Xuzhen He, Fang Wang, Wengui Li, Daichao Sheng
Summary: The study introduces the use of deep learning to train models for improving computational efficiency in stochastic analysis. Training models with a large dataset allows for accurate results for new data without the need for re-training. The research shows that deep learning models have a competitive edge in complex problems and can extend their capabilities by generating more data and re-training.
Article
Construction & Building Technology
Wenkui Dong, Wengui Li, Zhihui Sun, Idris Ibrahim, Daichao Sheng
Summary: This study applied different surface coatings to graphene/cement-based sensors to achieve superhydrophobicity and enhance piezoresistive stability. The results showed improved water resistance and sensitivity in the sensors, making them suitable for structural health monitoring of smart concrete infrastructure.
AUTOMATION IN CONSTRUCTION
(2022)
Article
Construction & Building Technology
Wenkui Dong, Wengui Li, Yipu Guo, Fulin Qu, Kejin Wang, Daichao Sheng
Summary: The study utilized SHP and CWA to enhance the impermeability of CB/cement-based sensors. Results showed that SHP improved water impermeability, while CWA enhanced chloride resistance. Performance testing in different environments demonstrated that SHP had a more stable impact on electrical resistivity and piezoresistivity.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Construction & Building Technology
Zhiyu Luo, Wengui Li, Kejin Wang, Surendra P. Shah, Daichao Sheng
Summary: The study analyzed the heterogeneity and properties of ITZs in geopolymer concrete, revealing that the gel-related phases at the top and bottom boundaries have higher mechanical properties. A strategy involving polished aggregates, rapid scratch, and statistical analysis was proposed for investigating complex ITZs within a reasonable testing duration.
CEMENT AND CONCRETE RESEARCH
(2022)
Article
Computer Science, Interdisciplinary Applications
Marti Lloret-Cabot, Daichao Sheng
Summary: This paper evaluates the computational performance of a first order accurate fully implicit integration scheme and four different order explicit substepping integration schemes, in order to provide practical guidance for solving numerical problems in geotechnical engineering involving critical state models.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Engineering, Geological
Chen-Xi Tong, Zong-Lei Dong, Quan Sun, Sheng Zhang, Jun-Xing Zheng, Daichao Sheng
Summary: Carbonate soils, with high compressibility and low particle strength, require special treatment in geotechnical applications. This study conducted one-dimensional compression tests on carbonate soils with different initial particle size distributions and void ratios at a high vertical stress. The results show different deformation mechanisms and behavior modes based on silt fraction and void ratio.
ENGINEERING GEOLOGY
(2022)
Biographical-Item
Computer Science, Interdisciplinary Applications
George Kouretzis, Daichao Sheng, Hywel Rhys Thomas
COMPUTERS AND GEOTECHNICS
(2022)
Article
Construction & Building Technology
Wenkui Dong, Wengui Li, Yipu Guo, Kejin Wang, Daichao Sheng
Summary: This study investigates the electrical, mechanical, and piezoresistive properties of graphene nanoplate (GNP)/cementitious composites after exposure to impact load. The results show that the composites filled with 2% GNP exhibit better stability and less variation in properties after impact compared to the composites filled with 1% GNP. This suggests that 2% GNP filled composites have great potential as cement-based sensors, providing stable piezoresistivity even after exposure to impact load.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Computer Science, Interdisciplinary Applications
Yinghao Deng, Yang Xia, Di Wang, Yan Jin
Summary: This study investigates the mechanism of hydraulic fracture propagation in laminated shale, develops a numerical solver, and validates the effectiveness of the method through simulation experiments. The study also examines the influence of the interaction between hydraulic fractures and weak interfaces on the mechanical properties of shale.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Zhichao Zhang, Mingfei Feng, Guangshuo Zhou, Zhenglong Xu
Summary: A thermodynamic constitutive model for structured and destructured clays is proposed in this paper. The model includes state-dependent relations of hyperelasticity and plasticity without the concept of yielding surface. The proposed model captures the couplings between elasticity and plasticity and the effects of bonding structure.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Deze Yang, Xihua Chu
Summary: Creep and stress relaxation behaviors in granular materials are influenced by the time-dependent changes in their microstructure, with particle shape playing a significant role. However, the effects of particle shape on these behaviors are still not well understood. In this study, 3D DEM models incorporating the rate process theory and superellipsoids are used to simulate creep and stress relaxation in granular samples with different aspect ratios and blockiness. The results show that both aspect ratio and blockiness have a significant influence on creep and stress relaxation, with aspect ratio affecting creep through contact force ratio and blockiness affecting stress relaxation through variation in normal contact force anisotropy. These findings provide insights into the effects of particle shape on creep and stress relaxation in granular assemblies.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Shahab Amanat, Kourosh Gholami, Reza Rafiee-Dehkharghani, Dipanshu Bansal
Summary: This paper investigates the optimal design of wave barriers using the modified non-dominated sorting genetic algorithm-II (NSGA-II) and the Bloch-Floquet theory. The aim is to find the optimal design of plane wave barriers with a wide bandgap at a low-frequency range and low construction cost. The study develops a modified NSGA-II algorithm to determine the optimal arrangement of concrete in wave barrier unit cells. The performance of the optimal barriers is examined through finite element simulation and their efficacy in attenuating plane S-waves is verified.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Yanlin Su, Guoqing Cai, Fengjie Yin, Yepeng Shan, Annan Zhou
Summary: This paper presents a novel elastic-viscoplastic constitutive model that takes into account particle breakage to reproduce the time-dependent behavior of coarse-grained soil. The model integrates the Unified Hardening (UH) model, the elastic-viscoplastic (EVP) model, and the overstress theory. The relationship between particle breakage and loading rate is established, and state variables associated with the critical state of coarse-grained soil are derived to consider both time and particle breakage. A three-dimensional elastic-viscoplastic constitutive model is constructed by combining a one-dimensional viscoplastic hardening parameter with a secondary consolidation coefficient considering particle breakage. The proposed model requires 19 parameters and effectively describes the influence of time-dependency and particle breakage on the shear, dilatancy, and compression behaviors of coarse-grained soil with different confining pressures or initial void ratios. Experimental data comparisons validate the model's ability to replicate the time-dependent behavior of coarse-grained soil.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Shichao Zhang, Yaqiong Wang, Qidong Gao, Xiaobo Ma, Haixiao Zhou, Zhifeng Wang
Summary: Accurately evaluating and predicting ground settlement during tunnel excavation is essential for ensuring tunnel stability. This study conducted a probabilistic analysis of ground settlement under uncertain soil properties. The results demonstrate that spatially variable soils significantly influence the ground settlement in the vertical direction.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Xu Zhang, Bin Luo, Youjun Xu, Zhiwen Yang
Summary: This paper presents an analytical solution for horizontal displacements induced by small radius curve shield tunneling. The formula is derived based on the image method and Mindlin solution, considering additional thrust, frictional resistance, ground loss, and grouting pressure. The solution is validated with on-site data, demonstrating its reliability and providing a new approach for predicting and controlling stratum horizontal displacements in curve shield tunneling. The study finds that ground loss has the most significant influence on displacements, and soil closer to the tunnel exhibits larger horizontal displacements.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Jian-Hong Wan, Ali Zaoui
Summary: Ground vibrations during earthquakes can cause soil strength loss and structural damage. Rubber-soil mixtures (RSM) have shown promise in reducing residual ground deformation. This study used molecular dynamics simulations to investigate the friction behavior of the rubber-clay interface in RSM systems. The results revealed a direct correlation between normal stress and friction force, with denser soil systems exhibiting higher friction forces.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Hongying Wang, Qiang Zhang, Peinan Wu, Yanjing Li, Lijun Han, Guilei Han
Summary: In addition to the Mohr-Coulomb and Hoek-Brown criteria, other nonlinear functions are used to describe the plastic response of rock mass. This paper derived the equivalent cohesive strength, frictional angle, and dilatancy angle for nonlinear yield and plastic flow rock masses. The solution for a circular tunnel in any nonlinear yield and plastic flow rock masses was derived and verified using a numerical procedure. The analysis of strain-softening rock masses under two assumed nonlinear yield criteria was also studied.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Zhijun Wu, You Wu, Lei Weng, Mengyi Li, Zhiyang Wang, Zhaofei Chu
Summary: This study proposed a machine learning approach to predict the uniaxial compression strength (UCS) and elastic modulus (E) of rocks. By measuring meso-mechanical parameters and developing grain-based models, a database with 225 groups of data was established for prediction models. The optimized kernel ridge regression (KRR) and gaussian process regression (GPR) models achieved excellent performance in predicting UCS and E.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Mingjun Zhou, Zhenming Shi, Chong Peng, Ming Peng, Kahlil Fredrick E. Cui, Bo Li, Limin Zhang, Gordon G. D. Zhou
Summary: In this paper, the erosion and deposition processes during overtopping dam breaching are simulated using a novel method (ED-SPH). The proposed model is able to capture the complex behaviors of dam soil erosion, entrainment, and depositions. Soil deposition hinders particle movement and reduces water velocity at the water-soil interface.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
C. Chavez-Negrete, F. J. Dominguez-Mota, R. Roman-Gutierrez
Summary: To accurately simulate groundwater flow in porous layered media, it is important to consider all environmental factors and use a generalized finite differences scheme as a meshless method for spatial discretization. This approach ensures robustness and accuracy of the numerical solution.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Shuairun Zhu, Lulu Zhang, Lizhou Wu, Lin Tan, Haolong Chen
Summary: This paper investigates the effectiveness of the cascadic multigrid method applied to the improved Picard iteration method for solving nonlinear problems in deforming variably saturated porous media. Two improved Picard iteration methods are proposed, and their effectiveness is verified through numerical examples. The results show that the improved methods have faster convergence and higher computational efficiency compared to the classical method.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Yuan Cao, Yan-Guo Zhou, Kyohei Ueda, Yun-Min Chen
Summary: Investigated shear stress responses of enclosed soil in deep soil mixing (DSM) grid-improved ground, and revealed the characteristics of the waist effect and mathematical model for shear stress reduction ratio.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Jinfan Chen, Zhihong Zhao, Jintong Zhang
Summary: This study develops data-driven criteria to estimate the peak shear strength (PSS) of rock fractures, considering the effects of surface roughness features. A high-quality dataset is created using particle-based discrete element method and diamond-square algorithm. Tree-based models and convolutional neural network are trained to predict the PSS of rock fractures, and their reliability is verified using experimental data.
COMPUTERS AND GEOTECHNICS
(2024)
