多工况下汉源二蛮山滑坡机理数值模拟
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摘要
利用FLAC3D软件对四川省雅安市汉源县二蛮山滑坡坡体进行建模,模拟降雨滑坡过程,并进行应力应变特征及稳定性计算分析,从而为深入研究地震及降雨诱发再次滑坡及防灾减灾提供可靠依据。研究中假设地震工况,对边坡进行详细的动力分析,得到了各监测点动力特征曲线;通过降雨工况下坡体稳定性系数分析得到了不同强度折减安全系数。研究结果表明,滑源区相对特殊的地形条件和地质构造以及不利的结构面组合是滑坡的基础;前期强降雨期间饱水加载以及大量雨水沿斜沟张裂结构面的下渗软化作用,是诱发滑坡发生的关键因素。
In this paper,the FLAC3D software was used to establish the model of Ermanshan Mountain in Hanyuan County,Ya'an City,Sichuan Province and to simulate the rainfall landslide process.The stress-strain features and slope stability were calculated and analysed in order to offer a reliable basis for the prediction of second landslide induced by earthquake and disaster prevention and reduction.Under the assumption of earthquake condition,the experiment detail analysed the dynamic characteristics of the side slope and obtained the dynamic characteristic curve of the monitoring points.Under the assumption of rainfall condition,the safety coefficient table with different strength reductions was acquired based on the stability analysis of the slope.Researches showed that the relatively special terrain conditions,geological structure and unfavourable structural surface combination were the basis of the landslide.Saturated water loading and the infiltration softening effect of a large amount of water along the oblique groove tension crack structural plane during the earlier heavy rainfall were the key factors causing landslide.
In this paper,the FLAC3D software was used to establish the model of Ermanshan Mountain in Hanyuan County,Ya'an City,Sichuan Province and to simulate the rainfall landslide process.The stress-strain features and slope stability were calculated and analysed in order to offer a reliable basis for the prediction of second landslide induced by earthquake and disaster prevention and reduction.Under the assumption of earthquake condition,the experiment detail analysed the dynamic characteristics of the side slope and obtained the dynamic characteristic curve of the monitoring points.Under the assumption of rainfall condition,the safety coefficient table with different strength reductions was acquired based on the stability analysis of the slope.Researches showed that the relatively special terrain conditions,geological structure and unfavourable structural surface combination were the basis of the landslide.Saturated water loading and the infiltration softening effect of a large amount of water along the oblique groove tension crack structural plane during the earlier heavy rainfall were the key factors causing landslide.
引文
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[10]常士骠,张苏民.工程地质手册(第四版)[M].北京:中国建筑工业出版社,2006:167～169.CHANG Shi-biao,ZHANG Su-min.Engineering geological manual(fourth edition)[M].Beijing:China Architecture&Building Press,2006:167～169.
[2]苏生瑞,张永双,郝莉莉,等.汶川地震断裂带附近建筑物的灾害效应模拟研究[J].地质力学学报,2011,17(4):381～387,409.SU Sheng-Rui,ZHANG Yong-sheng,HAO Li-li,et al.Numerical study on the hazard effect of a building near the faultproduced by the Wenchuan earthquake[J].Journal of Geomechanics,2011,17(4):381～387,409.
[3]甘建军,黄润秋,李前银,等.都江堰—汶川公路汶川地震次生地质灾害主要特征和形成机理[J].地质力学学报,2010,16(2):146～158.GAN Jian-jun,HUANG Run-qiu,LI Qian-yin,et al.Formation mechanism of geo-hazards triggered by Wenchuan Ms 8.0earthquake along Dujiangyan-Wenchuan highway[J].Journal of Geomechanics,2010,16(2):146～158.
[4]许强,董秀军,邓茂林,等.2010年7.27四川汉源二蛮山滑坡-碎屑流特征与成因机理研究[J].工程地质学报,2010,18(5):609～622.XU Qing,DONG Xiu-jun,DENG Mao-lin,et al.The Ermanshan rock slide-debris flow of July 27,2010 in Hanyuan,Sichuan:Characteristics and failure mechanism[J].Journal of Engineering Geology,2010,18(5):609～622.
[5]刘春玲,祁生文,童立强,等.利用FLAC3D分析某边坡地震稳定性[J].岩石力学与工程学报,2004,23(16):2730～2733.LIU Chun-ling,QI Sheng-wen,TONG Li-qiang,et al.Stability analysis slope under earthquake with FLAC3D[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(16):2730～2733.
[6]何专,姚令侃.地震和暴雨工况下边(滑)坡稳定性分析方法评价[J].水土保持通报,2009,29(3):178～181.HE Zhuan,YAO Ling-kan.Assessment on methods of analyzing slope(landslide)stability under earthquake and rainstorm[J].Bulletin of Soil and Water Conservation,2009,29(3):178～181.
[7]陈星,李建林,王家成.基于FLAC3D的边坡地震反应分析[J].中国农村水利水电,2010,(1):58～61.CHEN Xing,LI Jian-lin,WANG Jia-cheng.Seismic response analysis of slope based on FLAC3D[J].China Rural Waterand Hydropower,2010,(1):58～61.
[8]陈昌凯,阮永芬,熊恩来.地震作用下边坡稳定的动力分析方法[J].地下空间与工程学报,2005,1(6):1054～1057.CHEN Chang-kai,RUAN Yong-fen,XIONG En-lai.Dynamic analysis method of slope stability in earthquake function[J].Chinese Journal of Underground Space and Engineering,2005,1(6):1054～1057.
[9]史丹,陈蕴生,韩信,等.岩质边坡地震动力稳定性研究进展[J].西北农林科技大学学报:自然科学版,2006,34(2):147～150.SHI Dan,CHEN Yun-sheng,HAN Xin,et al.Seismic dynamic stability of rock slope research advance[J].Journal ofNorthwest Sci-Tech University of Agriculture and Forest:Natural Science Edition,2006,34(2):147～150.
[10]常士骠,张苏民.工程地质手册(第四版)[M].北京:中国建筑工业出版社,2006:167～169.CHANG Shi-biao,ZHANG Su-min.Engineering geological manual(fourth edition)[M].Beijing:China Architecture&Building Press,2006:167～169.
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