基于地震传播过程的滑坡动力稳定性分析

发布时间：2018-02-28 00:41

本文关键词： 地震滑坡动力稳定性稳定性系数时程地震传播过程玉树地震　出处：《岩土力学》2017年09期 　论文类型：期刊论文

【摘要】：当进行滑坡地震稳定性分析时,一般对滑体取某一固定的加速度,这忽略了地震波的传播过程。滑坡在地震中破坏的根本原因是地震波在岩土体中传播时,在滑体和滑床间形成了加速度差。推导了加速度差的计算公式,以青海省玉树机场路3号滑坡为原型,以玉树机场强震观测台的实测加速度时程为动力输入,采用传递系数法计算滑坡动力稳定系数时程曲线。结果表明,天然状态滑坡的稳定系数为1.269,最小动力稳定性系数为0.962,最小平均稳定系数为1.069。滑坡的整体稳定性较好,不会形成整体失稳,但会有局部变形,与震后实测现象一致。
[Abstract]:When seismic stability analysis of landslide is carried out, a fixed acceleration is usually taken to the sliding body, which ignores the propagation process of seismic wave. The fundamental cause of landslide failure in earthquake is when seismic wave propagates in rock and soil. The acceleration difference is formed between the sliding body and the sliding bed. The calculation formula of the acceleration difference is derived. Taking the No. 3 landslide of Yushu Airport Road in Qinghai Province as the prototype, and taking the measured acceleration time history of the Yushu Airport strong earthquake Observatory as the dynamic input, The time history curve of landslide dynamic stability coefficient is calculated by transfer coefficient method. The results show that the stability coefficient of natural landslide is 1.269, the minimum dynamic stability coefficient is 0.962, and the minimum average stability coefficient is 1.069. The whole instability will not be formed, but there will be local deformation, which is consistent with the observed phenomenon after the earthquake.
【作者单位】：西南交通大学土木工程学院;中铁西北科学研究院有限公司;
【基金】：国家自然科学基金(No.51178402) 国家重点研发计划(No.2016YFC0802200) 中央高校基本科研业务费专项资金资助~~
【分类号】：P642.22;TU435

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