某高速铁路不良地质体稳定性研究

Numerical Simulation Study on the Stability of Unfavorable Geological Bodies of A High Speed Railway

为保证拟建高速铁路施工及运营安全,针对沿线分布的不良地质体,在进行详细工程地质调绘、坑探、挖探及钻探等综合勘查的基础上,采用物探高密度电法,解译出不良地质体的物质组成、结构及发育深度。研究表明,该不良地质体为斜坡体,基于刚体极限平衡法,利用Geo-Slope软件模拟分析该斜坡的稳定性。综合考虑浅表部第四系堆积物的整体稳定性和可能存在的剪出口部位,建立3个计算概化模型,并根据斜坡的特征,模拟了自重、"自重+暴雨"、"自重+地震"3种工况,分析各潜在剪出口在各工况下的稳定性,并给出斜坡稳定性和危险性评价。

In order to ensure the safety during the construction and operation period of a high speed railway,the high density electrical method of geophysical prospecting was applied on the basis of comprehensive surveys of detailed engineering geology surveying,pit exploration,excavation and drilling for the unfavorable geological bodies distributed along the line.The material composition,structure and development depth of the unfavorable geological bodies were interpreted.Research showed that the unfavorable geological bodies were slope bodies.Based on the rigid body limit equilibrium method,Geo-Slope software was used to simulate and analyze the stability of the slope.Considering the overall stability of the quaternary deposits on surface layer and the possible shear exit positions,three calculation generalization models were established.Based on the characteristics of the slope,the self-weight,“self-weight+heavy rain”,and“self-weight+earthquake”that three kinds of working conditions were simulated.Finally,the stability of each potential shear exit under each working condition were analyzed,and slope stability and risk evaluation were presented.