Article
Computer Science, Interdisciplinary Applications
Qiang Zhang, Wei He, Hai-Yang Zhang, Hong-Ying Wang, Bin-Song Jiang
Summary: This paper presents a numerical finite strain solution for a circular tunnel in different rock masses, and parametric analysis shows the impact of different factors on displacement and softening regions. The finite strain solution is essential for displacement prediction and supporting design.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Construction & Building Technology
Qiang Zhang, Xiao-Fei Wang, Bin-Song Jiang, Ri-Cheng Liu, Gui-Min Li
Summary: This paper presents a semi-analytical finite strain solution for circular roadways excavated in a strain-softening rock mass with a non-associated flow rule. The solution is validated by similarity solutions and numerical simulation, showing consistency with field test results.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2021)
Article
Construction & Building Technology
Yaocai Ma, Aizhong Lu, Hui Cai, Xiangtai Zeng
Summary: An analytical solution is proposed for studying the plastic zones developed around two circular tunnels with unequal size excavated in intact rock governed by the Mohr-Coulomb yield criterion. The solution involves the use of conformal transformation to map the elastic-plastic interfaces on the physical plane onto an annulus on the image plane. A set of nonlinear equations involving mapping function coefficients is constructed, and the differential-evolution algorithm is used to solve these equations.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2022)
Article
Engineering, Multidisciplinary
Yaocai Ma, Hehua Zhu, Wuqiang Cai, Chenlong Su, Xiangyang Wei
Summary: Based on the unified strength criterion, this study proposes an analytical solution to investigate the impact of tunnel axial stress on the development of failure zone around a circular tunnel. The proposed method handles the non-axisymmetric problem under a high and complex three-dimensional stress condition. The mechanical behavior of the rock mass follows an elastic-brittle-plastic model. The presented solution is compared with published analytical solutions, demonstrating its reliability and generality.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Construction & Building Technology
Chenlong Su, Hehua Zhu, Wuqiang Cai, Wei Wu, Qi Zhang
Summary: This paper proposes an EPP constitutive approximation model of rock mass considering three-dimensional strength and strain-softening characteristics, and provides a forward analysis method for the equivalent Geological Strength Index (GSIeq). Extensive case studies show that the proposed method agrees well with the ESS model, with small errors in the Ground Response Curve. The effect of E and p0 on GSIeq, as well as the gradual decrease of GSIeq to GSIr with increasing in-situ stress level, are also studied.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Geochemistry & Geophysics
Xiaoding Xu, Yuejin Zhou, Chun Zhu, Chunlin Zeng, Chong Guo
Summary: This paper presents a model to predict the formation and evolution of the excavation damage zone (EDZ) in surrounding rock of deep-buried tunnels. The model takes into account the stress characteristics of the tunnel surrounding rock and considers the effects of strain softening and dilatancy during rock deformation. Sensitivity analysis is also performed to examine the influence of different factors in the model. The results provide valuable references for future numerical and experimental studies.
Article
Engineering, Geological
Haohua Chen, Hehua Zhu, Lianyang Zhang
Summary: This paper introduces a new analytical solution for deep circular tunnels in rock, taking into account the disturbed zone, 3D strength, and large strain. Through MATLAB analysis, the proposed solution was validated and extensive parametric studies were conducted, revealing significant effects of the disturbed zone and flow rule on stress and displacement distributions around the tunnel.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Engineering, Geological
Chen Xu, Caichu Xia
Summary: A new large strain solution for tunnel excavated in strain-softening rocks under high geostress is proposed, which allows accurate prediction of rock stresses, strains, and deformations. Parametric studies show that the calculation error produced by small strain theory can reach 30% when the deformation of surrounding rock exceeds about 10%R0, indicating the necessity of using large strain theory for calculation.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
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
Chemistry, Multidisciplinary
Xuechao Dong, Mingwei Guo, Shuilin Wang
Summary: Strain-softening analyses were conducted on a circular bore in a Mohr-Coulomb rock mass under hydrostatic stress and out-of-plane stress. The results showed that stresses and displacements around the bore were influenced by axial stress and proper consideration of out-of-plane stress was necessary. The numerical solution was validated by the transition between elastic-brittle-plastic and elastic-perfectly plastic behavior.
APPLIED SCIENCES-BASEL
(2021)
Article
Computer Science, Interdisciplinary Applications
Yingming Xiao, Manchao He, Yafei Qiao, Menglong Peng, Hongru Li, Tai Cheng
Summary: The nonlinearity of rock becomes more significant as the buried depth increases, affecting stress redistribution and deformation patterns during tunneling. A newly proposed UHS model and the finite difference method are used to obtain a semi-analytic solution that accurately calculates the plastic internal variable and stress state in the plastic zone, without stress vibration in the strain-hardening zone. The model is validated and the effects of strain-hardening, strain-softening, and prestress on ground reactions are highlighted.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Multidisciplinary
Sheng Yu-ming, Li Chao, Xia Ming-yao, Zou Jin-feng
Summary: This study investigates an elastoplastic model for the surrounding rock of an axisymmetric circular tunnel under three-dimensional principal stress states, proposing novel numerical solutions for strain-softening surrounding rock based on the modified 3D Hoek-Brown criterion. The distributions for stresses and displacement can be effectively determined under a 3D axisymmetric coordinate system, with the modified 3D Hoek-Brown strength criterion embedded into finite element software for characterizing the yielding state of surrounding rock. The proposed approach provides reliable solutions for stability analysis of surrounding rock in deep buried tunnels under 3D principal stress conditions.
INTERNATIONAL JOURNAL OF NONLINEAR SCIENCES AND NUMERICAL SIMULATION
(2022)
Article
Chemistry, Multidisciplinary
Wenbo Chen, Dingli Zhang, Qian Fang, Xuanhao Chen, Tong Xu
Summary: In this study, a finite strain solution for a soft rock tunnel under high geostress was derived and a numerical procedure for solving the solution was proposed. The method showed high accuracy and efficiency in approximating boundary conditions and was validated through comparison with self-similar solutions, recursive solutions, and FLAC simulation results.
APPLIED SCIENCES-BASEL
(2022)
Article
Construction & Building Technology
Tianzheng Li, Wenping Gong, Xiaoli Yang
Summary: The study evaluates face stability using a non-circular tunnel and finds that soil strength in tensile regime is significantly reduced. By introducing a tensile strength cut-off to define a linearly varying soil dilatancy angle, the failure mechanism is studied where the failure surface in tensile regime eventually forms a rounded corner at the top.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2021)
Article
Engineering, Geological
Yingming Xiao, Yafei Qiao, Manchao He, Menglong Peng, Chun Zhu
Summary: In this study, a novel solution is proposed to analyze the effect of rock's nonlinear behavior on ground reaction. The solution effectively eliminates stress vibrations and improves computational efficiency by judging the elastic or plastic state of the calculation nodes. The results show that the initial yield strength, residual strength, peak strength, and supporting pressure all have significant effects on ground reaction.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2023)
Article
Engineering, Geological
Mengmeng Lu, Dongxu Li, Hongwen Jing, Yuebao Deng
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2019)
Article
Computer Science, Interdisciplinary Applications
Hefu Pu, Peng Yang, Mengmeng Lu, Yang Zhou, Jiannan (Nick) Chen
COMPUTERS AND GEOTECHNICS
(2020)
Article
Engineering, Civil
Mengmeng Lu, Qiang Zhang, Hongwen Jing, Yixian Wang, Chuanxun Li
Summary: This paper investigates the consolidation behavior of soft soil improved by a new type of composite column. An analytical model is developed and analytical solutions are derived for both circular and non-circular cross sectional composite columns. Parametric analysis and comparison to existing solutions are conducted to study the consolidation behavior.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2022)
Article
Engineering, Geological
J. Shan, M. Lu, K. Yang
Summary: A new analytical model for the consolidation of composite ground stabilized by composite piles is proposed in this paper, taking into account the time-dependent clogging effect and obtaining analytical solutions for instantaneous loading and multi-stage instantaneous loading. The feasibility of the solutions is verified and applied to laboratory tests.
GEOSYNTHETICS INTERNATIONAL
(2022)
Article
Computer Science, Interdisciplinary Applications
Mengmeng Lu, Jinxin Sun
Summary: Vacuum preloading is commonly used for soft soil improvement projects, but traditional methods may lead to reduced drainage capacity. To address this, a new technique called air-boosted vacuum preloading (AVP) has been introduced, where pre-buried air-boosted pipes are used to enhance water head differences and accelerate consolidation of soft soils. Analytical models and field tests show that AVP can be more effective in accelerating consolidation compared to conventional methods.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Engineering, Geological
Jinxin Sun, Mengmeng Lu
Summary: Air-boosted vacuum preloading is a newly emerging soft soil-improving technology with limited analytical theories available. To address this, an analytical model is proposed based on equal volumetric strain and Darcy's law, considering time-dependent clogging and smear effects. Solutions under different loading conditions are developed and compared with conventional vacuum consolidation, revealing the enhanced consolidation effect of air-boosted vacuum preloading. The model is further used to investigate the influence of various parameters on consolidation behavior and validated with a field test.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2023)
Article
Engineering, Geological
Jie Shan, M. M. Lu
Summary: Composite pile is a new pile technology composed of a stiffer core with gravel shell, which improves soft soils with various shapes and sizes. Compared to piles with single materials, composite piles avoid drawbacks such as slow consolidation and limited load bearing capacity. An analytical model is proposed to investigate the consolidation characteristics of soft ground improved by composite piles, and its feasibility and applicability are verified through comparisons with previous studies and a case.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2023)
Article
Engineering, Marine
Bin Zhu, Qing Yang, Tetsuya Hiraishi, Hajime Mase, Huafu Pei, Tao Wang, Mengmeng Lu
Summary: This study develops a stochastic numerical model to investigate the response of a spatially heterogeneous seabed with a submerged breakwater. The model is implemented using the COMSOL platform and validated with analytical solutions and experimental data. Probabilistic analysis is performed to explore the effects of coefficient of variation and correlation lengths in random fields. This study provides a valuable tool and insights for the probabilistic assessment of soil response in a spatially heterogeneous seabed around structures.
Article
Engineering, Geological
Liu Gao, Kuihua Wang, Tao Wang, MengMeng Lu, Pinqiang Mo
Summary: This paper establishes a theoretical model of a defective pile-beam system, considering the soil as a continuous three-dimensional model and the pile as a Rayleigh-Love rod model with transversal inertia effect. The impedance function recursion method, RSPT, and AIFTM are used to derive the impedance of the pile top. The dynamic response of the system is obtained in both frequency and time domains. The velocity measurements at the pile-beam connection and the pile body can be used to assess defects.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2023)
Article
Engineering, Geological
Jinxin Sun, Mengmeng Lu, Bolin Han
Summary: The technology of composite ground is widely used in engineering projects, with a trend towards using multiple types instead of a single column. The combined use of long prefabricated vertical drains (PVDs) and short soil-cement columns has been proposed and utilized in ground improvement projects. However, there are few analytical theories available for consolidating this technique. In this study, an analytical model is proposed to predict the consolidation behavior of combined composite ground, and the results are compared with existing analytical models and measurement data.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2023)
Article
Engineering, Geological
Ding-Bao Song, He-Fu Pu, Meng-Meng Lu, Chun-Xue Zhang, Zhan-Yi Li, Jian-Nan Nick Chen
Summary: This study presented a method called PHDVPS that effectively and rapidly treats mud slurry with high water content. The PHDVPS method outperforms traditional vacuum preloading or solidification methods in terms of volume reduction and strength improvement. Experimental tests showed that PHDVPS-treated soils had higher dewatering efficiency and better mechanical properties. Furthermore, the performance of the PHDVPS method is influenced by factors such as initial water content, cement content, duration of vacuum preloading, and vacuum pressure magnitude.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2023)
Article
Engineering, Civil
Yuan Guo, Chen Wang, Mengmeng Lu, Xiong (Bill) Yu
Summary: This study investigates the contact erosion process at the interface between soil layers consisting of coarse-grained and fine-grained particles through physical tests and representative volume CFD-DEM simulations. The results show that particle size ratio is a significant factor that determines the occurrence and development of contact erosion. Particle shape has a major influence on the contact erosion process. Meanwhile, the critical inflow velocity and particle size ratio for contact erosion occurrence can be determined via the coupled model presented in this study.
TRANSPORTATION GEOTECHNICS
(2023)
Article
Engineering, Geological
Chuanxun Li, Mengmeng Lu, Haotian Ma
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2020)
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)
