The Experts below are selected from a list of 108513 Experts worldwide ranked by ideXlab platform
M A Xianfeng - One of the best experts on this subject based on the ideXlab platform.
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numerical study on the seismic response of the underground subway station surrounding Soil Mass ground adjacent building system
Frontiers of Structural and Civil Engineering, 2017Co-Authors: Guobo Wang, Mingzhi Yuan, M A XianfengAbstract:Ground buildings constructed above metro station have increased very quickly due to the limited land resources in urban areas. In this paper, the seismic response of the Underground subway station-Surrounding Soil Mass-Ground adjacent buildings (USG) system subjected to various seismic loading is studied through numerical analysis. The numerical model is established in terms of the calculation domain, boundary condition, and contact property between Soil and structure based on the real project. The reciprocal influence between subway station and ground adjacent building, and their effects on the dynamic characteristics of surrounding Soil Mass are also investigated. Through the numerical study, it is found that the impact of underground structure on the dynamic characteristics of the surrounding Soil Mass depends on its own dimension, and the presence of underground structure has certain impact on the seismic response of ground adjacent building. Due to the presence of underground structure and ground adjacent building, the vertical acceleration generated by the USG system cannot be ignored. The outcomes of this study can provide references for seismic design of structures in the USG system.
Jin-feng Zou - One of the best experts on this subject based on the ideXlab platform.
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Elasto-plastic solution for cavity expansion problem in anisotropic and drained Soil Mass
Geomechanics and Engineering, 2019Co-Authors: Jin-feng ZouAbstract:This study presents an elasto-plastic (EP) solution for drained cavity expansion on the basis of unified strength failure criterion and considers the influence of initial stress state. Because of the influence of initial consolidation of Soil Mass, the initial stress may be anisotropic in the natural Soil Mass. In addition, the undrained hypothesis is usually used in the calculation of cavity expansion problem, but most of the cases are in the drained situation in practical engineering. Eventually, the published solution and the presented solution are compared to verify the suitability of the study.
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Anisotropic elasto-plastic solutions for cavity expansion problem in saturated Soil Mass
Soils and Foundations, 2019Co-Authors: Jin-feng ZouAbstract:Abstract On the basis of the yield criterion of Matsuoka and Nakai (1974), novel elasto-plastic solutions are obtained for the cavity expansion problem in an anisotropic medium. The solutions are formulated by employing a small-strain analysis in an elastic zone and a large-strain analysis in a plastic zone around the cavity in a Soil Mass. In light of the initial condition, the plastic radius and the stress in the plastic zone are derived by incorporating the large-strain analysis, the influence of stress anisotropy (K0) and the non-associated flow rule, and two fundamental solutions for the cavity expansion problem under undrained and drained conditions are presented in an anisotropic Soil Mass. Finally, a comparison with the previous results is performed for verification.
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A numerical stepwise approach for cavity expansion problem in strain-softening rock or Soil Mass
Geomechanics and Engineering, 2019Co-Authors: Jin-feng Zou, Tao Yang, Wang Ling, Wujun Guo, Faling HuangAbstract:A numerical stepwise approach for cavity expansion problem in strain-softening rock or Soil Mass is investigated, which is compatible with Mohr–Coulomb and generalized Hoek-Brown failure criteria. Based on finite difference method, plastic region is divided into a finite number of concentric rings whose thicknesses are determined internally to satisfy the equilibrium and compatibility equations, the material parameters of the rock or Soil Mass are assumed to be the same in each ring. For the strain-softening behavior, the strength parameters are assumed to be a linear function of deviatoric plastic strain (yp*) for each ring. Increments of stress and strain for each ring are calculated with the finite difference method. Assumptions of large-strain for Soil Mass and small-strain for rock Mass are adopted, respectively. A new numerical stepwise approach for limited pressure and plastic radius are obtained. Comparisons are conducted to validate the correctness of the proposed approach with Vesic\'s solution (1972). The results show that the perfectly elasto-plastic model may underestimate the displacement and stresses in cavity expansion than strain-softening coefficient considered. The results of limit expansion pressure based on the generalised H-B failure criterion are less than those obtained based on the M-C failure criterion.
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Closed-Form Solution for Undrained Cavity Expansion in Anisotropic Soil Mass Based on Spatially Mobilized Plane Failure Criterion
International Journal of Geomechanics, 2019Co-Authors: Jin-feng Zou, Si-ga AAbstract:AbstractA closed-form solution for the undrained cavity expansion problem in an anisotropic Soil Mass is investigated based on the spatially mobilized plane (SMP) model in this study. Stress and st...
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A numerical stepwise approach for analysis of cavity expansion in strain-softening rock or Soil Mass
Transylvanian Review, 2017Co-Authors: Feng Wang, Ming-yao Xia, Jin-feng ZouAbstract:This paper presents a numerical stepwise approach for analysis of cavity expansion in strain-softening rock or Soil Mass compatible with a linear Mohr–Coulomb or a generalized Hoek–Brown failure criterion. The conditions of the axisymmetric, plane strain and un-drained conditions are assumed for the cavity expansion problem. The initial in situ stress is assumed to be hydrostatic. In the presented approach, the plastic region is divided into a finite number of concentric rings whose thicknesses are determined internally to satisfy the equilibrium and compatibility equations, and the material parameters of the rock or Soil Mass are assumed to be the same in everyone ring. For the strain-softening behavior, it is assumed that all the strength parameters are a linear function of deviatoric plastic strain () for each rings. The increments of stress and strain for each rings are calculated with the finite difference method. The assumptions of the large strain for Soil Mass and the small strain for rock Mass are adopted, respectively. Solutions of limited pressure and plastic radius are obtained by the numerical stepwise approach. Comparisons are conducted to validate the correctness of the proposed solution with Vesic’s solution (1975). Numerical examples are also carried out to highlight the influence of the strain-softening characteristic on the stress and displacement.
Guobo Wang - One of the best experts on this subject based on the ideXlab platform.
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numerical study on the seismic response of the underground subway station surrounding Soil Mass ground adjacent building system
Frontiers of Structural and Civil Engineering, 2017Co-Authors: Guobo Wang, Mingzhi Yuan, M A XianfengAbstract:Ground buildings constructed above metro station have increased very quickly due to the limited land resources in urban areas. In this paper, the seismic response of the Underground subway station-Surrounding Soil Mass-Ground adjacent buildings (USG) system subjected to various seismic loading is studied through numerical analysis. The numerical model is established in terms of the calculation domain, boundary condition, and contact property between Soil and structure based on the real project. The reciprocal influence between subway station and ground adjacent building, and their effects on the dynamic characteristics of surrounding Soil Mass are also investigated. Through the numerical study, it is found that the impact of underground structure on the dynamic characteristics of the surrounding Soil Mass depends on its own dimension, and the presence of underground structure has certain impact on the seismic response of ground adjacent building. Due to the presence of underground structure and ground adjacent building, the vertical acceleration generated by the USG system cannot be ignored. The outcomes of this study can provide references for seismic design of structures in the USG system.
Ndiaga Cisse - One of the best experts on this subject based on the ideXlab platform.
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Numerical Analysis of Shallow Foundations in a Soil Mass under Various Behavior Laws
American journal of mechanical engineering, 2019Co-Authors: Oustasse Abdoulaye Sall, Déthié Sarr, Ndiaga CisseAbstract:This paper proposes to study the Soil-structure interaction (SSI) applied to shallow foundations. To conduct the study, a characterization of the foundation Soils is carried out. The finite element study is conducted using the Optum G2 software that allows taking into account the various Soil Mass behavior. Two types of superficial foundations (individual footing and strip footing) embedded in a homogeneous and stratified Soil Mass are modeled. The method proceeds to a parametric study of the Soil Mass by varying the modulus of elasticity, the angle of internal friction, the cohesion, the Poisson’s ratio and the failure criteria to study their influences on the mechanical behavior of the foundation. The results obtained show that with the increasing variation of the modulus of elasticity (E), the clay becomes more and more stiff and ductile. For a given stress value, there is a decrease in deformations as the ductility of the clay increases. During the consolidation analysis, it is found that the lower the Young's modulus, more the material is compressible. This shows that the modulus of elasticity of the Soil Mass depends on its state of consolidation. The study reveals that the constitutive law, the intrinsic properties and the lithology of the Soil Mass condition the mode of ruin of the structure.
Xin Wei Yang - One of the best experts on this subject based on the ideXlab platform.
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Continuous Displacement Measurement of Soil Mass Using White Light Digital Image Analysis in Frequency Domain
Proceedings of the International Conference on Logistics Engineering Management and Computer Science, 2015Co-Authors: Xin Wei Yang, Qifang ZhanAbstract:The displacement and deformation of Soil Mass is the important index in civil engineering. In this paper, white light digital image analysis in frequency domain is introduced to measure the continuous displacement of Soil Mass. This method has the characteristics of whole -field, non-contact measurement and the measuring system is very simple. CCD camera is used to record the images of Soil Mass before and after deformation. The images are digitalized and th en analyzed to obtain the displacement of the specimen by using frequency domination correlation arithmetic. Comparing the experimental result with the theoretical value of displacements, the usability of this method for measuring the displacement and deformation is certified.
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Surface Displacement Measurement of Soil Mass by White Light Digital Image Analysis in Frequency Domain
Advanced Materials Research, 2014Co-Authors: Xin Wei Yang, Wen Guang ShiAbstract:The surface displacement of Soil Mass is an important standard for safety in civil engineering. In this paper, white light digital image analysis in frequency domain is introduced tomeasure surface displacement of Soil Mass. This method has the characteristics of whole-field, non-contact measurement and the simple measuring system and can obtain displacements by frequency domination correlation arithmetic. Surface displacements of Soil Mass are obtained by white light digital image analysis in frequency domain. Comparing the experimental results and the theoretical values, the little error exists and the usefulness of this method is certified.
