Article
Construction & Building Technology
Jagdish Prasad Sahoo, Bibhash Kumar
Summary: This study obtained solutions for evaluating the minimum support pressure for maintaining peripheral stability of circular tunnels in clay, considering anisotropic undrained shear strength parameters. The finite element method and second order cone programming technique were used, showing that the anisotropic shear strength of clay significantly influences the required support pressure.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2021)
Article
Computer Science, Interdisciplinary Applications
Gaoqiao Wu, Heng Zhao, Minghua Zhao
Summary: This study introduces random adaptive finite element limit analysis (RAFELA) to investigate the stability of the footing-void system with random soils, focusing on quantifying the influence of spatial variability on bearing capacity and failure probability. Results show that failure probability increases with greater distance between the void and footing, higher coefficient of variation (COV) and smaller vertical correlation length. Design tables are presented to assess potential failure probability under different conditions, indicating a positive correlation between failure probability and diffusion degree of failure curves.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Computer Science, Interdisciplinary Applications
Rui Sun, Junsheng Yang, Shouhua Liu, Feng Yang
Summary: The rigorous adaptive lower bound limit analysis method was used to study the stability and failure mechanism of dual unlined horseshoe-shaped tunnels in non-homogeneous clays. The results demonstrate significant influences of dimensionless parameters on tunnel stability and provide a direct evaluation tool for tunnel designers.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Engineering, Civil
Rui Zhang, Gaoqiao Wu, Minghua Zhao, Ming Lei
Summary: This study investigated the undrained seismic stability of dual unsupported circular tunnels using an adaptive finite element limit analysis. Parametric studies and visualized results showed the significant impact of seismic effects on tunnel stability and failure mechanisms.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2021)
Article
Engineering, Civil
A. N. Antao, M. Vicente da Silva, N. Monteiro, N. Deusdado
Summary: This paper discusses the determination of upper and lower bounds for three-dimensional undrained stability of shallow tunnels, with the soil shear strength modeled using the Tresca criterion. Results show a clear improvement in stability number bounds for various geometrical and resistance configurations compared to previous findings. Proposed equations provide an approach to estimating the stability number.
TRANSPORTATION GEOTECHNICS
(2021)
Article
Computer Science, Interdisciplinary Applications
Pooyan Jafari, Ahmad Fahimifar
Summary: This paper investigates the face stability of rectangular shield-driven tunnels in undrained clays, where the undrained shear strength increases linearly with depth. Two new failure mechanisms are proposed based on the translational movement of rigid blocks and continuous deformation of soil mass. The analytical solutions are compared with numerical simulations and existing approaches in the literature to evaluate their validity. The critical support pressures obtained from the analytical models are consistent with numerical simulations, and simple design formulas are provided for practical use. Parametric studies explore the impact of different geometrical and geotechnical parameters on tunnel face stability.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Chemistry, Multidisciplinary
Yongge Zeng, Gaoqiao Wu
Summary: This study used an adaptive finite element limit analysis code to investigate the stability of dual tunnels in cohesive-frictional soil under surcharge loading and seismic action. Parametric studies were conducted, and strict upper and lower bound results with small relative errors were obtained. Design tables and failure patterns were provided for engineering design. The results showed that soil unit weight and void depth have a nearly linear effect on seismic bearing capacity. The dual tunnel system is vulnerable to seismic actions, and the stability of tunnels is further undermined by the adverse effects of seismic-caused interactions between adjacent tunnels.
APPLIED SCIENCES-BASEL
(2022)
Article
Construction & Building Technology
Van Qui Lai, Jim Shiau, Suraparb Keawsawasvong, Sorawit Seehavong, Lowell Tan Cabangon
Summary: This study examines the stability of unsupported rectangular excavations in undrained clay, taking into account anisotropy and heterogeneity. It introduces a novel approach by using the three-dimensional finite element upper and lower bound limit analysis with the Anisotropic Undrained Shear (AUS) failure criterion. The study provides numerical solutions and develops a basis for predicting the stability of such excavations, which is of great interest to engineering practitioners.
Article
Computer Science, Interdisciplinary Applications
Hongzhen Chen, Zhichao Shen, Le Wang, Yinghui Tian, Xuanxuan Chu
Summary: Finite-element limit analysis was used to study the undrained capacities of skirted circular foundations under fully three-dimensional loading. The failure envelope in the normalised H-M loading plane was described to represent the ultimate limit state of the foundations. The effects of various factors on the failure envelopes were discussed. Equations were proposed to describe the uniaxial capacities and failure envelopes of skirted circular foundations under different loading combinations, which can be used for initial foundation design. An example was presented to illustrate the application procedure of the proposed equations.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Environmental
Bin Zhu, Tetsuya Hiraishi
Summary: The efficient discretization of high definition and large geometric size multidimensional random fields remains a challenge. This study proposes a decomposed K-L expansion method for the discretization of a 3-D random field. The method decomposes the 3-D random field into separate one-dimensional random fields and computes the eigenpairs in each dimension respectively. The proposed method significantly reduces the computational time and memory requirements compared to the traditional K-L expansion method, making it potentially useful for stochastic finite element analysis.
STOCHASTIC ENVIRONMENTAL RESEARCH AND RISK ASSESSMENT
(2023)
Article
Multidisciplinary Sciences
Yongge Zeng, Tianqin Zeng, Gaoqiao Wu
Summary: The stability of dual circle tunnels buried in layered soils with different shear strengths was investigated using finite element limit analysis (FELA). The study quantifies the influence of existing tunnels on newly-built ones and provides design suggestions, especially in terms of the optimum construction location. By using FELA modelling, the variation trends of undrained bearing capacity under different influential factors were further investigated. It was concluded that there is a specific inclination-fixed worst-band, where the worst undrained stability occurs once a bottom tunnel is constructed. Interestingly, the inclination remains constant while the horizontal distance changes with the soil properties. Additionally, three collapse patterns were summarized.
SCIENTIFIC REPORTS
(2022)
Article
Computer Science, Interdisciplinary Applications
Rui Zhang, Heng Zhao, Gaoqiao Wu
Summary: The ultimate bearing capacity of an eccentrically loaded strip footing above twin square tunnels buried in rock masses was examined using the generalized Hoek-Brown (GHB) yield criteria. The stability assessments were carried out using finite element limit analysis (FELA) code in combination with a sophisticated adaptive remeshing approach. The study demonstrated the effect of load eccentricity, rock mass strength parameters, and tunnel position on the stability of the strip footing through comprehensive parametric analyses and visualized results.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Marine
Deokhee Won, Jihye Seo, Seungjun Kim
Summary: This study proposed a type of submerged floating tunnel with a dual section and investigated its hydrodynamic behavior using an analytical method. The finite element analysis technique was verified by comparison with previous hydraulic test results. The resistance characteristics under waves and currents were found to be very different according to the two proposed mooring methods.
Article
Computer Science, Interdisciplinary Applications
N. Luo, Z. Luo
Summary: This study investigates the influence of rotated anisotropy of soil property on the bearing capacity of embedded strip footings using the random finite element method. The major scale of fluctuation was found to have a significant impact on the probability of bearing capacity failure, while the mean bearing capacity remained almost constant regardless of the rotation angle. Additionally, the probability of bearing capacity failure decreased with an increase in rotation angle, emphasizing the importance of considering soil layer orientation in geotechnical foundation design for safety and reliability.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Mathematics, Applied
Erik Jansson, Mihaly Kovacs, Annika Lang
Summary: This paper considers the solution of fractional elliptic stochastic partial differential equations on the sphere using Spherical Whittle--Mate'\rn Gaussian random fields. The approximation is done using surface finite elements and a quadrature of the Dunford-Taylor integral representation. Strong error analysis is performed and the computational complexity is bounded. Numerical experiments confirm the theoretical findings.
SIAM JOURNAL ON SCIENTIFIC COMPUTING
(2022)
Article
Construction & Building Technology
Yao Xiao, Minghua Zhao, Rui Zhang, Heng Zhao, Gaoqiao Wu
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2019)
Article
Computer Science, Interdisciplinary Applications
Gaoqiao Wu, Heng Zhao, Minghua Zhao, Yao Xiao
COMPUTERS AND GEOTECHNICS
(2020)
Article
Computer Science, Interdisciplinary Applications
Gaoqiao Wu, Rui Zhang, Minghua Zhao, Shuai Zhou
COMPUTERS AND GEOTECHNICS
(2020)
Article
Engineering, Geological
Gaoqiao Wu, Minghua Zhao, Heng Zhao, Yao Xiao
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2020)
Article
Engineering, Civil
Gaoqiao Wu, Minghua Zhao, Heng Zhao
Summary: This study investigated the undrained seismic bearing capacity of strip footings embedded in two-layered slopes using finite element limit analysis. Results indicated that seismic bearing capacity increases with the growth of horizontal embedment depth of footings.
EARTHQUAKE SPECTRA
(2021)
Article
Engineering, Civil
Rui Zhang, Gaoqiao Wu, Minghua Zhao, Ming Lei
Summary: This study investigated the undrained seismic stability of dual unsupported circular tunnels using an adaptive finite element limit analysis. Parametric studies and visualized results showed the significant impact of seismic effects on tunnel stability and failure mechanisms.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2021)
Article
Computer Science, Interdisciplinary Applications
Gaoqiao Wu, Minghua Zhao, Rui Zhang, Guanting Liang
COMPUTERS AND GEOTECHNICS
(2020)
Article
Chemistry, Multidisciplinary
Yongge Zeng, Gaoqiao Wu
Summary: This study used an adaptive finite element limit analysis code to investigate the stability of dual tunnels in cohesive-frictional soil under surcharge loading and seismic action. Parametric studies were conducted, and strict upper and lower bound results with small relative errors were obtained. Design tables and failure patterns were provided for engineering design. The results showed that soil unit weight and void depth have a nearly linear effect on seismic bearing capacity. The dual tunnel system is vulnerable to seismic actions, and the stability of tunnels is further undermined by the adverse effects of seismic-caused interactions between adjacent tunnels.
APPLIED SCIENCES-BASEL
(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)