地震动作用下黄土边坡稳定性分析

Analysis on Stability of Loess Slope during Different Ground Motion

摘要:

以甘肃省内两种典型的高速公路沿线边坡作为研究对象,利用有限元数值模拟计算分析了不同地震动对支护边坡和无支护边坡稳定性的影响。计算结果表明,随着地震动峰值加速度的增大边坡安全系数逐渐降低;支护不但有助于提高边坡自身的稳定性,而且有利于增强边坡坡体的抗震性能。边坡支护设计强度主要依照当地可能遭受的最大地震动计算,以便最大限度地发挥支护提高边坡稳定性的效率。

Abstract:

Two typical loess slopes along with highway in Gansu province are selected as research object. Using the finite element method, the stability of slopes with and without supports influenced by different ground motion are studied, and the efficiency Of supports to protect the slope body is analyzed as well. Results of calculation indicate that the safety coefficient reduces with increase of seismic peak acceleration, and the stability of slope depresses obviously. The supports for slope not only improve the stability of loess slope, but also enhance the aseismic behavior of slope for the design of support strength on the loess slop, it should be based on the maximum intensity of local ground motion, in order to advance the efficiency of the supports.