降雨和地震耦合作用对滑坡稳定性的影响——以甘肃西和Ⅲ号滑坡为例
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摘要
以甘肃省西和县西山Ⅲ号滑坡为例分析了地震与降雨耦合作用对滑坡稳定性的影响。采用GEOSTUDIO软件对其进行了天然及地震降雨耦合作用两种条件下的数值模拟。通过计算结果对比可知,西山Ⅲ号滑坡在天然状态下处于稳定状态;地震降雨耦合作用对西山Ⅲ号滑坡的稳定会起到很强的削弱作用,滑坡将处于失稳状态。在此处采用的计算条件下,相同降雨量下地震与不同降雨强度的耦合作用显示,降雨强度越小雨水入渗相对越多,地震作用下超孔隙水压力影响区域越大,滑坡越不稳定。
The stability of landslides under the coupling action of earthquake and rainfall is analyzed with an example of No.Ⅲ landslide of Xihe county,Gansu province.We adopte Geostudio software to simulate the landslide in two conditions,i.e.natural status and the coupling influence from earthquake and rainfall.The analysis result shows that the landslide is generally stable in nature state;on the contrary,the coupling action could have serious impact on the stability of NO.Ⅲ landslide of Xihe county.The result also shows that with same calculation condition and rainfall,a certain magnitude earthquake coupling with three kinds of rainfall intensities could cause different landslide possibilities;the less rainfall intensity may cause the more reduction of the landslide stability,due to a more volume of infiltration water and a wider distributional zone of exceeding pore pressure associated with earthquake.
The stability of landslides under the coupling action of earthquake and rainfall is analyzed with an example of No.Ⅲ landslide of Xihe county,Gansu province.We adopte Geostudio software to simulate the landslide in two conditions,i.e.natural status and the coupling influence from earthquake and rainfall.The analysis result shows that the landslide is generally stable in nature state;on the contrary,the coupling action could have serious impact on the stability of NO.Ⅲ landslide of Xihe county.The result also shows that with same calculation condition and rainfall,a certain magnitude earthquake coupling with three kinds of rainfall intensities could cause different landslide possibilities;the less rainfall intensity may cause the more reduction of the landslide stability,due to a more volume of infiltration water and a wider distributional zone of exceeding pore pressure associated with earthquake.
引文
[1]乔建平,杨宗佶,田宏岭.降雨滑坡预警的概率分析方法[J].工程地质学报,2009,17(3):343-348.
[2]Dongyeob KIM,Sangjun IM,Sang Ho LEE,et al.Predictingthe Rainfall-Triggered Landslides in a Forested Mountain Re-gion Using TRIGRS Model[J].Mt.Sci.,2010,7(1):83-91.
[3]李长江,麻土华,李炜,等.滑坡频度—降雨量的分形关系[J].中国地质灾害与防治学报,2010,21(1):87-93.
[4]黄润秋.20世纪以来中国的大型滑坡及其发生机制[J].岩石力学与工程学报,2007,26(3):434-455.
[5]李守定,李晓,张军,等.唐家山滑坡成因机制与堰塞坝整体稳定性研究[J].岩石力学与工程学报,2010,29(1):2908-2915.
[6]Premchitt J.Salient aspects of landslides in Hong Kong[A]∥proceedings of the 9th Asian Regional Conference on Soil Me-chanics and Foundation Engineering[C].Bangkok,Thailand:1991:497-502.
[7]Johnson K A,Sitar N.Hydrologic conditions leading to debris-flow Initiation[J].Can.Geotech.J.,1990,27(6):789-801.
[8]穆鹏,董兰凤,吴玮江.兰州市九州石峡口滑坡形成机制与稳定性分析[J].西北地震学报,2008,30(4):332-336.
[9]David K Keefer.Landslides caused by earthquakes[J].Geolog-ical Society of America Bulletin,1984,95(4):406-421.
[10]史宏彦,谢定义.土坡抗震稳定性分析的有限元———滑动面法[J].西北地震学报,2001,23(1):46-52.
[11]石玉成,李兰,刘红玫.黄土的震陷性与其微结构特征的关系研究[J].西北地震学报,2002,24(2):129-134.
[12]徐文杰,陈祖煜,何秉顺,等.肖家桥滑坡堵江机制及灾害链效应研究[J].岩石力学与工程学报,2010,29(5):933-942.
[13]孙军杰,王兰民,龙鹏伟,等.地震与降雨耦合作用下区域滑坡灾害评价方法[J].岩石力学与工程学报,2011,3(4):752-760.
[14]吴宏伟,陈守义,庞宇威.雨水入渗对非饱和土坡稳定性影响的参数研究[J].岩土力学,1999,20(1):1-14.
[15]范昭,张丽华.地震作用下边坡稳定性分析[J].西北地震学报,2010,32(4):339-342.
[2]Dongyeob KIM,Sangjun IM,Sang Ho LEE,et al.Predictingthe Rainfall-Triggered Landslides in a Forested Mountain Re-gion Using TRIGRS Model[J].Mt.Sci.,2010,7(1):83-91.
[3]李长江,麻土华,李炜,等.滑坡频度—降雨量的分形关系[J].中国地质灾害与防治学报,2010,21(1):87-93.
[4]黄润秋.20世纪以来中国的大型滑坡及其发生机制[J].岩石力学与工程学报,2007,26(3):434-455.
[5]李守定,李晓,张军,等.唐家山滑坡成因机制与堰塞坝整体稳定性研究[J].岩石力学与工程学报,2010,29(1):2908-2915.
[6]Premchitt J.Salient aspects of landslides in Hong Kong[A]∥proceedings of the 9th Asian Regional Conference on Soil Me-chanics and Foundation Engineering[C].Bangkok,Thailand:1991:497-502.
[7]Johnson K A,Sitar N.Hydrologic conditions leading to debris-flow Initiation[J].Can.Geotech.J.,1990,27(6):789-801.
[8]穆鹏,董兰凤,吴玮江.兰州市九州石峡口滑坡形成机制与稳定性分析[J].西北地震学报,2008,30(4):332-336.
[9]David K Keefer.Landslides caused by earthquakes[J].Geolog-ical Society of America Bulletin,1984,95(4):406-421.
[10]史宏彦,谢定义.土坡抗震稳定性分析的有限元———滑动面法[J].西北地震学报,2001,23(1):46-52.
[11]石玉成,李兰,刘红玫.黄土的震陷性与其微结构特征的关系研究[J].西北地震学报,2002,24(2):129-134.
[12]徐文杰,陈祖煜,何秉顺,等.肖家桥滑坡堵江机制及灾害链效应研究[J].岩石力学与工程学报,2010,29(5):933-942.
[13]孙军杰,王兰民,龙鹏伟,等.地震与降雨耦合作用下区域滑坡灾害评价方法[J].岩石力学与工程学报,2011,3(4):752-760.
[14]吴宏伟,陈守义,庞宇威.雨水入渗对非饱和土坡稳定性影响的参数研究[J].岩土力学,1999,20(1):1-14.
[15]范昭,张丽华.地震作用下边坡稳定性分析[J].西北地震学报,2010,32(4):339-342.
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