降雨条件下膨胀土裂隙边坡深层浅层滑坡渗透稳定性分析
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摘要
为研究裂隙膨胀土在平均型降雨条件下的渗流特性以及稳定性的变化规律,利用Geo-slope软件建立了裂隙膨胀土有限元模型,对不同位置及不同深度的裂隙进行了模拟,得到了孔压以及安全系数的变化规律。结果表明:上部和中部裂隙土边坡孔压呈现明显的"分层"效应,下部裂隙土边坡孔压呈现线性增大的规律;下部浅层滑动面安全系数变幅大于上部浅层,深层滑动面安全系数变化不大;安全系数总体上呈现降雨时逐渐减小,停雨后逐渐增大的趋势,裂隙深度为2m时的边坡安全系数要大于裂隙深度为4m的工况。研究成果为裂隙膨胀土边坡的失稳机理的认识及安全防护提供了相应的参考。
In order to study the seepage characteristics and the change law of stability of fissured expansive soil under average rainfall condition,a finite element model of fissured expansive soil is established with Geo-slope to simulate the fractures in different positions and depths,the variation law of pore pressure and safety factor is obtained.Results show that the pore pressure of the upper and middle fractured soil slopes shows an obvious"layering effect",the pore pressure of the lower fractured soil slope increases linearly;the safety factor amplitude of the lower shallow slip surface is larger than that of the upper shallow layer,the safety factor of the deep sliding surface varies little;generally,the safety coefficient decreases gradually when rainfall occurs,and increases gradually after rain,when the fracture depth is 2 m,the safety factor of the slope is larger than that of the fracture depth of 4 m.The research results provide a reference for the instability mechanism and safety protection of the fractured expansive soil slope.
In order to study the seepage characteristics and the change law of stability of fissured expansive soil under average rainfall condition,a finite element model of fissured expansive soil is established with Geo-slope to simulate the fractures in different positions and depths,the variation law of pore pressure and safety factor is obtained.Results show that the pore pressure of the upper and middle fractured soil slopes shows an obvious"layering effect",the pore pressure of the lower fractured soil slope increases linearly;the safety factor amplitude of the lower shallow slip surface is larger than that of the upper shallow layer,the safety factor of the deep sliding surface varies little;generally,the safety coefficient decreases gradually when rainfall occurs,and increases gradually after rain,when the fracture depth is 2 m,the safety factor of the slope is larger than that of the fracture depth of 4 m.The research results provide a reference for the instability mechanism and safety protection of the fractured expansive soil slope.
引文
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[17]GEO-SLOPE International Ltd.Seepage modeling with SEEP/W 2007[M].Calgary:Geo-Slope International Ltd.,2010.
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[2]陈善雄,戴张俊,陆定杰,等.考虑裂隙分布及强度的膨胀土边坡稳定性分析[J].水利学报,2014,45(12):1442-1449.
[3]Snow D T.Anisotropie permeability of fractured media[J].Water Resources Research,2010,5(6):1273-1289.
[4]Vol N A.Coupled discrete-continuum approach for modelling of water flow in jointed rocks[J].Géotechnique,1993,43(1):21-36.
[5]袁俊平,殷宗泽.考虑裂隙非饱和膨胀土边坡入渗模型与数值模拟[J].岩土力学,2004,25(10):1581-1586.
[6]袁俊平,蔺彦玲,丁鹏,等.裂隙诱导各向异性对边坡降雨入渗的影响[J].岩土工程学报,2016,38(1):76-82.
[7]程国明,马凤山,王思敬,等.基于几何测量法的裂隙岩体渗透性研究[J].岩石力学与工程学报,2004,23(21):3595-3599.
[8]姚海林,郑少河,李文斌,等.降雨入渗对非饱和膨胀土边坡稳定性影响的参数研究[J].岩石力学与工程学报,2002,21(7):1034-1039.
[9]付宏渊,曾铃,王桂尧,等.降雨入渗条件下软岩边坡稳定性分析[J].岩土力学,2012,33(8):2359-2365.
[10]王一兆,隋耀华.降雨入渗对边坡浅层稳定性的影响[J].长江科学院院报,2017,34(4):122-125.
[11]Pradel D,Raad G.Effect of permeability on surficial stability of homogeneous slopes[J].Journal of Geotechnical Engineering,1993,119(2):315-332.
[12]平扬,刘明智,郑少河.降雨入渗条件下的膨胀土边坡稳定性分析[J].岩土力学与工程学报,2004,23(Z1):4478-4484.
[13]刘平.降雨条件下考虑裂隙的膨胀土边坡非稳定渗流数值模拟[D].长沙:长沙理工大学,2007.
[14]胡云进.裂隙非饱和渗流试验研究及有地表入渗的裂隙岩体渗流数值分析[D].南京:河海大学,2001.
[15]Fredlund D G,Rahardjo H.Soil mechanics for unsaturated soils[M].New York:Wiley,1993.
[16]蒋泽锋,朱大勇.强降雨条件下具有张裂缝边坡临界滑动场[J].岩土力学,2016,37(S2):25-34.
[17]GEO-SLOPE International Ltd.Seepage modeling with SEEP/W 2007[M].Calgary:Geo-Slope International Ltd.,2010.
[18]吴珺华,袁俊平,杨松.基于滤纸法的裂隙膨胀土土水特征曲线试验[J].水利水电科技进展,2013,33(5):61-64.