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Upper bound solutions of stability factor of shallow tunnels in saturated soil based on strength reduction technique

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Journal of Central South University 2012年第7期19卷 2008-2015页

作者：黄阜张道兵孙志彬金启云 School of Civil Engineering and Architecture Changsha University of Science and Technology School of Civil Engineering Central South University

Based on the upper bound theorem of limit analysis,the factor of safety for shallow tunnel in saturated soil is calculated in conjunction with the strength reduction *** analyze the influence of the pore pressure on the factor of safety for shallow tunnel,the power of pore pressure is regarded as a power of external force in the energy *** the rigid multiple-block failure mechanism,the objective function for the factor of safety is constructed and the optimal solutions are derived by employing the sequential quadratic *** to the results of optimization calculation,the factor of safety of shallow tunnel for different pore pressure coefficients and variational groundwater tables are *** parameter analysis shows that the pore pressure coefficient and the location of the groundwater table have significant influence on the factor of safety for shallow tunnel.

关键词： strength reduction technique upper bound theorem pore pressure shallow tunnel factor of safety

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Finite element analyses of slope stability problems using non-associated plasticity

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Journal of Rock Mechanics and Geotechnical Engineering 2018年第6期10卷 1091-1101页

作者： Simon Oberhollenzer Franz Tschuchnigg Helmut F.Schweiger Institute of Soil Mechanics Foundation Engineering and Computational Geotechnics Graz University of Technology

In recent years, finite element analyses have increasingly been utilized for slope stability problems. In comparison to limit equilibrium methods, numerical analyses do not require any definition of the failure mechanism a priori and enable the determination of the safety level more accurately. The paper compares the performances of strength reduction finite element analysis(SRFEA) with finite element limit analysis(FELA), whereby the focus is related to non-associated plasticity. Displacement-based finite element analyses using a strength reduction technique suffer from numerical instabilities when using non-associated plasticity, especially when dealing with high friction angles but moderate dilatancy angles. The FELA on the other hand provides rigorous upper and lower bounds of the factor of safety(FoS) but is restricted to associated flow rules. Suggestions to overcome this problem, proposed by Davis(1968), lead to conservative FoSs; therefore, an enhanced procedure has been investigated. When using the modified approach, both the SRFEA and the FELA provide very similar results. Further studies highlight the advantages of using an adaptive mesh refinement to determine FoSs. Additionally, it is shown that the initial stress field does not affect the FoS when using a Mohr-Coulomb failure criterion.

关键词： Finite element limit analysis(FELA) Finite element method Slope stability strength reduction technique Non-associated plasticity Adaptive mesh refinement Initial stresses

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Research on stability of a slope due to underground mining

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Journal of Coal Science & Engineering(China) 2013年第4期19卷 474-482页

作者： Hong-Jie LI Hui-Ya ZHONG Wei-Chao LI Mine Safety Technology Branch China Coal Research Institute Beijing 100013 China State Key Laboratory of Coal Mining and Clean Utilization (China Coal Research Institute) Beijing 100013 China Mid-South Design and Research Institute CHEC Changsha 410014 China China Institute of Water Resources and Hydropower Research Beijing 100048 China

This paper will present a detailed analysis of the deformation mechanism and stability assessment of the slope through field investigations, numerical modeling and measurements. Field investigation indicated that three thin coal seams encountered large mined-out area at one side and free surface of hill slope at the other side, which lead to the caving of roof strata movement, ground movement and crown crack along the preferred orientations of joints. The three-dimensional numeri- cal modeling study on the case demonstrated that the plasticity failure occurred gradually along with the extension of mined-out area in depth. When the depth of mining reached the verge defined by the seismic prospecting method, a large mount of tension failure occurred on the crown of the slope. The factor of safety was 1.36 calculated by the shear strength reduction technique, which indicated the slope was in stable state. The measurement showed that the residual deformation occurred before 1998 and became stable subsequently, which indicated that the residual deformation almost finished and the slope is in stable state.

关键词： underground mining stability of slope numerical modeling strength reduction technique monitoring

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