›› 2017, Vol. 38 ›› Issue (9): 2708-2712.doi: 10.16285/j.rsm.2017.09.031

• 岩土工程研究 • 上一篇    下一篇

基于地震传播过程的滑坡动力稳定性分析

杨 涛1,黄 琳1,冯 君1,吴红刚2,戚宗柯2   

  1. 1. 西南交通大学 土木工程学院,四川 成都 610031;2. 中铁西北科学研究院有限公司,甘肃 兰州 730000
  • 收稿日期:2016-06-24 出版日期:2017-09-11 发布日期:2018-06-05
  • 通讯作者: 冯君,男,1977年生,博士,副教授,主要从事岩土体稳定性及控制技术研究。E-mail: fengjun4316@163.com E-mail: 03017003@163.com
  • 作者简介:杨涛,男,1973年生,博士,副教授,主要从事边坡稳定性方面的研究
  • 基金资助:

    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。

Dynamic stability analysis of landslide based on earthquake propagation process

YANG Tao1, HUANG Lin1, FENG Jun1, WU Hong-gang2, QI Zong-ke2   

  1. 1. School of Civil Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China; 2. Northwest Research Institute of Co., Ltd. of C. R. E. C., Lanzhou, Gansu 730000, China
  • Received:2016-06-24 Online:2017-09-11 Published:2018-06-05
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (51178402), the State’s Key Project of Research and Development Plan (2016YFC0802200) and the Special Fund for Basic Scientific Research Business Expense in the Central University.

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。

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

Abstract: In general, a certain value of acceleration is applied to the sliding mass when analyzing the seismic stability of landslides,which ignores the propagation of seismic wave during the process. However, the failure of a landslide in an earthquake is fundamentally caused by the occurrence of the acceleration difference between the sliding body and the sliding bed when seismic waves propagate in rock and soil. In this study, a formula was deduced to calculate the acceleration difference. Taken the Yushu airport road landslide III in Qinghai province as an example, the dynamic input was referred to the time history curve of acceleration recorded at the airport seismological observatory in Yushu earthquake. Meanwhile, the time history curve of the dynamic stability coefficient of the landslide was obtained by using the transfer coefficient method. The calculated results show that the stability coefficient of the landslide in natural state is 1.269, the minimum dynamic stability coefficient is 0.962, and the minimum average stability coefficient is 1.069. The above results indicate that the overall stability of landslide is good. Although the entire failure of landslide would not occur in an earthquake, some local deformation happens. It is also verified that the calculated results are consistent with the observed phenomenon after the earthquake.

Key words: seismic landslide, dynamic stability, stability coefficient time history, earthquake propagation process, Yushu earthquake

中图分类号: 

  • TU 452

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