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- 저자 : An-Jui Li (검색결과 2 건)
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Seismic Slope Stability Evaluation Considering Rock Mass Disturbance Varying in the Slope
An-Jui Li,Zhiguang Qian,Jing-Cai Jiang,Andrei Lyamin 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.3
Seismic effect is one of the most commonly considered factors in rock slope safety design. This study adopts the finite element lower bound limit analysis method to study the seismic stability of disturbed rock slopes considering inhomogeneity caused by rock mass disturbance. Moreover, this research investigates different earthquake magnitudes by considering various seismic coefficients. Results are presented as seismic rock slope stability charts. In addition, the recommended blasting damage zones are also investigated in this study. Results show the chart solutions can provide a reasonable tool for the preliminary evaluations of the seismic safety factors for rock slope stability. The case studies demonstrate that a safe design can be done if the earthquake effects are considered reasonably. Moreover, consideration of varying rock mass disturbance in the slope is helpful to capture the failure mechanism more realistically when compared to the slope case without varying rock mass disturbance. For comparison purposes, the conventional limit equilibrium analysis and the equivalent Mohr-Coulomb parameters are used to perform analyses of the rock slope stability.
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An-Jui Li,Joram Wachira Mburu,Chao Wei Chen,Kuo-Hsin Yang 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.3
Matric suction plays a key role in slope stability by conferring an apparent cohesion component to the unsaturated portion of the soil. This paper adopts the total cohesion method to investigate the contribution of apparent cohesion on the stability of silty slopes under hydrostatic conditions. Phase2 and Optum G2 numerical programs, based on strength reduction finite element analysis and finite element limit analysis methods, respectively, are used for numerical analysis. Generally, Phase2 and Optum G2 results are in good agreement with each other. Optum G2 yields slightly higher factor of safety results than Phase2, particularly for steep slopes β ≥ 30°. The results are presented in form of stability charts which are validated with a case from a previous study. Notably, the contribution of apparent cohesion to unsaturated shear strength is most pronounced when varying the water table. An examination of the slope failure mechanism reveals that the toe failure mechanism is the dominant failure mechanism. The depth of the failure surface is most sensitive to changes in the slope angle, cohesion and water table position. The influence of the air-entry value on the depth of the failure surface is contingent upon the location of the water table.
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