考虑降雨滑坡多级滑动的改进传递系数法研究  

Improved transfer coefficient method considering multistage sliding of rainfall landslides

作　　者：文豪 陈国庆[1] 李红 马金根 吴章雷 Wen Hao;Chen Guoqing;Li Hong;Ma Jin'gen;Wu Zhanglei(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China;Chengdu Engineering Corporation Limited,Power Construction Corporation,Chengdu 610072,China)

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都610059 [2]中国电建集团成都勘测设计研究院有限公司,成都610072

出　　处：《地质科技通报》2022年第6期162-168,共7页Bulletin of Geological Science and Technology

基　　金：国家自然科学基金项目(42090054;41972284)。

摘　　要：在多级滑坡的渐进破坏过程中,滑带不同部位的屈服程度和破坏模式不同,强度参数也不同。在强降雨条件下,坡表产生的张拉裂缝充水,会产生静水压力。当前广泛应用的传递系数法对滑带不同位置取同一强度参数,也尚未考虑到静水压力作用。为此提出了一种考虑静水压力作用和滑带不同部位强度参数差异的改进传递系数法,对降雨引起的西安市柳西村南部的牛角沟滑坡进行了计算。结果表明:与不考虑静水压力和滑带不同部位强度参数差异的计算方法比,改进传递系数法计算的抗滑力相对较小,剩余下滑力计算结果相对较大,各级滑坡稳定性系数分别减小了约33.26%、17.92%、24.95和16.94%;而改进前的稳定性系数偏高,可能会导致支挡工程的安全储备不足。本研究提出的改进传递系数法可为多级滑坡处置提供更安全的参考。In the progressive failure process of multiple landslides,different parts of the slip zone have different yielding degrees and failure modes with different strength parameters.Under strong rainfall conditions,water-filled tension cracks generated on the slope surface give rise to hydrostatic pressure.The current widespread transfer coefficient method,which takes the same strength parameter for different locations of the slip zone,also has not yet taken into account the hydrostatic pressure effect.In this paper,we propose an improved transfer coefficient method which takes into account the hydrostatic pressure effect and the difference in strength parameters of different parts of the slip zone.The results show that,compared with the calculation method without considering the hydrostatic pressure and the difference in strength parameters in different parts of the slip zone,the anti-sliding force calculated by the improved transfer coefficient method is relatively small,the residual sliding force is relatively large,and the stability coefficients of landslides at all levels are reduced by approximately 33.26%,17.92%,24.95%and 16.94%,respectively.Based on the high stability coefficient before the improvement,it may lead to insufficient safety reserve of the retaining engineering.The improved transfer coefficient method proposed in this paper can provide a safer reference for multiple landslide disposal.

关 键 词：改进传递系数法 多级滑坡 稳定性评价 滑坡渐进破坏特征 静水压力作用 降雨 

分 类 号：P642.22[天文地球—工程地质学]