关键词: 地震, 均质土坡, 动力响应, 平台, 剪应变, 塑性区, 稳定性评价指标

Abstract: A numerical model was established by using finite element software to simulate the dynamic response and stability of slope. In the simulation, a baseline-corrected 10s horizontal acceleration was set as earthquake input, and the platform amount, platform width and platform distribution were set different. Furthermore, according to the particle PGD amplification coefficients, peak dynamic shear stresses, maximum shear strains after earthquake, plastic zones and stability indexes of slope in different conditions during the earthquake, the dynamic response and stability of slope were quantitatively assessed. Results suggest that: for slopes of 40m high in the present paper, single platform set at 15m and 20m is beneficial to the slope’s dynamic stability; while in the case of setting double platforms, platform position at 10m-20m of the slope could better restrain the instability than other positions; for slopes of multiple levels, with the increase of platform width, the global failure trend gradually degenerates into local failure, which could greatly reduce the stress concentration at the slope toe; in addition, shear stress is prone to concentrate at the inner side of platform, so the slope toes should be strengthened at all levels.

Key words: earthquake, homogeneous soil slope, dynamic response, platform, shear strain, plastic zone, stability evaluation index