Analysis of landslide stability under seismic action and subsequent rainfall: a case study on the Ganjiazhai giant landslide along the Zhaotong-Qiaojia road during the 2014 Ludian earthquake, Yunnan, China
Analysis of landslide stability under seismic action and subsequent rainfall: a case study on the Ganjiazhai giant landslide along the Zhaotong-Qiaojia road during the 2014 Ludian earthquake, Yunnan, China
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地震作用及后续降雨作用下滑坡稳定性分析——以2014年云南鲁甸地震昭通至乔家公路甘家寨特大滑坡为例
DOI：
10.1007/s10064-020-01890-z
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发表时间：
2020-07
影响因子：
4.2
通讯作者：
Du Yuxiang
中科院分区：
文献类型：
--
作者：
Fu Xiaodong;Sheng Qian;Li Guo;Zhang Zhenping;Zhou Yongqiang;Du Yuxiang
强震不仅会引发大量同震滑坡，还会诱发岩石和土壤的松弛和裂缝，使这些岩石和土壤在随后的降雨过程中容易失稳，因此，强震对滑坡的影响总是长期的。以2014年云南鲁甸6. 5级地震中发生的甘家寨特大滑坡为例，对昭通至巧家公路沿线的地质灾害进行了沿着调查。首先，采用极限平衡分析和Newmark法，对滑坡体地震前的临界地震烈度进行了估算。其次，采用非连续变形分析方法模拟了滑坡在实测地震动作用下的动态破坏过程。最后，基于应力-渗流耦合分析和鲁甸气象站降水资料，对滑坡在震后降雨过程中的稳定性进行了预测。结果表明，该地震灾害的临界烈度在Ⅷ度~ IX度之间，与震害调查结果基本一致。动态破坏过程可分为4个阶段，形成4个陡坎，第1陡坎和第4陡坎为后续降雨的潜在滑动区，其临界降雨量分别为35-40 mm和55-60 mm。本文对该滑坡在强震前、中、震后的破坏过程进行了模拟和稳定性预测，为极震区滑坡的动力稳定性分析提供了方法。
In a strong earthquake, not only a large number of coseismic landslides are triggered, but relaxation and cracks in the rocks and soils are induced, which make these rocks and soils vulnerable to instability during subsequent rainfall; thus, strong earthquakes always have long-term effects on landslides. The geo-hazards along the Zhaotong-Qiaojia road in the 2014 Ludian earthquake (Ms 6.5) of Yunnan Province, China, were investigated, and the Ganjiazhai giant landslide was chosen as a case study. First, using the limit equilibrium analysis and Newmark method, the critical seismic intensity of the landslide before the earthquake was evaluated. Secondly, the dynamic failure process of the landslide under the measured ground motion was simulated with the discontinuous deformation analysis method. Lastly, based on stress–seepage coupling analysis and precipitation data from Ludian meteorological station, the stability of the landslide during subsequent rainfall after the earthquake was predicted. The results show that the critical seismic intensity was within degrees VIII–IX, which is consistent with the results of the earthquake damage investigation. The dynamic failure process can be divided into four stages, and four scarps formed; the potential sliding zones during the subsequent rainfall were at the first scarp and the fourth scarp, and their critical rainfall amounts were 35–40 mm and 55–60 mm, respectively. In this paper, failure process simulation and stability prediction of the landslide before, during, and after the strong earthquake are presented, which provide analysis methods for the dynamic stability of landslides in the meizoseismal area.
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影响因子：
1.3
作者：
Spence J;Casale A;Assmann T;Liebherr JK;Penev L
通讯作者：
Penev L
影响因子：
7.4
作者：
Domenech, Guillem;Fan, Xuanmei;Hales, Tristram C.
通讯作者：
Hales, Tristram C.
DOI：
10.1017/9781108892858.001
发表时间：
2020-09
期刊：
The European Monetary Union
影响因子：
--
作者：
通讯作者：
--
影响因子：
2.6
作者：
Neri C
通讯作者：
Neri C
影响因子：
1.5
作者：
Georges Zaccour
通讯作者：
Georges Zaccour