库区水位下降作用下非饱和土坡稳定性分析
|
摘要
针对库区及河道沿岸岸堤和边坡由于水力作用侵蚀和水位变动形成折线形土坡,影响边坡稳定性的问题,基于卢宁提出的非饱和有效应力理论,运用极限平衡方法,采用对数螺旋滑动面建立的平衡方程求解安全系数,开展了土坡不同几何参数和土性参数下水位变动对边坡稳定性影响的变化规律研究.通过对比非饱和与饱和土边坡安全系数计算结果,进一步揭示参数反演中不应忽略非饱和吸力作用对边坡稳定的贡献,分析水位缓降与骤降不同工况下可以得到危险水位高度,对指导工程有一定参考价值.
Due to the influence of hydraulic erosion and water level fluctuation,the folded-line slopes are produced by the embankments and slopes along the reservoirs and rivers. Based on the strength theory of unsaturated soil proposed by Lu Ning and the limit equilibrium method,the log-spiral failure surface derived from variational analysis is employed to calculate the factor of safety. We investigate the influences of water level fluctuation during the different geometrical parameters of slope and soil properties. We find the contribution of unsaturated suction to slope stability is considered in parameter inversion,comparing the safety factor analysis of unsaturated soil slope with that of saturated soil slope. Hazardous water level height is obtained by analyzing the different working conditions of water slow drop and sudden drop,which has a certain reference value for guilding the engineering.
Due to the influence of hydraulic erosion and water level fluctuation,the folded-line slopes are produced by the embankments and slopes along the reservoirs and rivers. Based on the strength theory of unsaturated soil proposed by Lu Ning and the limit equilibrium method,the log-spiral failure surface derived from variational analysis is employed to calculate the factor of safety. We investigate the influences of water level fluctuation during the different geometrical parameters of slope and soil properties. We find the contribution of unsaturated suction to slope stability is considered in parameter inversion,comparing the safety factor analysis of unsaturated soil slope with that of saturated soil slope. Hazardous water level height is obtained by analyzing the different working conditions of water slow drop and sudden drop,which has a certain reference value for guilding the engineering.
引文
[1] CLAGUE J J,STEAD D. Landslides:types,mehanisms and modeling[M]. Cambridge:Cambridge University Press,2012.
[2] DAI F,LEE C F,WANG S. Analysis of rainstorm-induced slide-debris flows on natural terrain of Lantau Island,Hong Kong[J].Engineering Geology,1999,51(4):279-290.
[3]陈敬虞,FREDLUND D G.非饱和土抗剪强度理论的研究进展[J].岩土力学,2003(s2):655-660.
[4]陈正汉,郭楠.非饱和土与特殊土力学及工程应用研究的新进展[J].岩土力学,2019,40(1):1-54.
[5]包承纲.非饱和土的性状及膨胀土边坡稳定问题[J].岩土工程学报,2004,26(1):1-15.
[6]张文杰,詹良通,凌道盛,等.水位升降对库区非饱和土质岸坡稳定性的影响[J].浙江大学学报(工学版),2006,40(8):1365-1370.
[7]刘东燕,辜文杰,侯龙.降雨及地下水位对三峡库区非饱和土边坡稳定性的影响[J].水利水电技术,2013,44(7):111-115.
[8]李健,巫锡勇,侯龙.水位变动对库区非饱和路堑边坡稳定性的影响分析[J].路基工程,2014(3):90-94.
[9] MUKHLISIN M,TAHA M R,KEN’ICHIROU K. Numerical analysis of effective soil porosity and soil thickness effects on slope stability at a hillslope of weathered granitic soil formation[J]. Geosciences Journal,2008,12(4):401-410.
[10] RAHIMI A,RAHARDJO H,LEONG E C. Effect of hydraulic properties of soil on rainfall-induced slope failure[J]. Engineering Geology,2010,114(3-4):135-143.
[11] TSAPARAS I,RAHARDJO H,TOLL D G,et al. Controlling parameters for rainfall-induced landslides[J]. Computers and Geotechnics,2002,29(1):1-27.
[12] LU N,LIKOS W J. Unsaturated soil mechanics[M]. New York:John Wiley&Sons,2004.
[13] BAKER R. Tensile strength,tension cracks,and stability of slopes[J]. Soils Found,1981,21(2):1-17.
[14] LESHCHINSKY D. Slope stability analysis:generalized approach[J]. Geotechnical Engineering,1990,116(5):851-867.
[15] LU N,GODT J W,WU D T. A closed-form equation for effective stress in unsaturated soil[J]. Water Resources Research,2010,46(5):567-573.
[16] VAHEDIFARD F,LESHCHINSKY D,MORTEZAEI K,et al. Effective stress-based limit-equilibrium analysis for homogeneous unsaturated slopes[J/OL]. International Journal of Geomechanics,2016,16(6):D4016003,https://ascelibrary.org/doi/10.1061/%28ASCE%29GM.1943-5622.0000554.
[17] GARDNER W R. Some steady state solutions of the unsaturated moisture flow equation with application to evaporation from a water table[J]. Soil Science,1958,85(4):228-232.
[18] ZIENKIEWICZ O C,HUMPHESON C,LEWIS R W. Associated and non-associated visco-plasticity and plasticity in soil mechanics[J]. Geotechnique,1975,25(25):671-689.
[19] GRIFFITHS D V,LU N. Unsaturated slope stability analysis with steady infiltration or evaporation using elasto-plastic finite elements[J]. International Journal for Numerical&Analytical Methods in Geomechanics,2005,29(3):249-267.
[20] VIRATJANDR C,MICHALOWSKI R L. Limit analysis of submerged slopes subjected to water drawdown[J]. Canadian Geotechnical Journal,2006,43(8):802-814.
[2] DAI F,LEE C F,WANG S. Analysis of rainstorm-induced slide-debris flows on natural terrain of Lantau Island,Hong Kong[J].Engineering Geology,1999,51(4):279-290.
[3]陈敬虞,FREDLUND D G.非饱和土抗剪强度理论的研究进展[J].岩土力学,2003(s2):655-660.
[4]陈正汉,郭楠.非饱和土与特殊土力学及工程应用研究的新进展[J].岩土力学,2019,40(1):1-54.
[5]包承纲.非饱和土的性状及膨胀土边坡稳定问题[J].岩土工程学报,2004,26(1):1-15.
[6]张文杰,詹良通,凌道盛,等.水位升降对库区非饱和土质岸坡稳定性的影响[J].浙江大学学报(工学版),2006,40(8):1365-1370.
[7]刘东燕,辜文杰,侯龙.降雨及地下水位对三峡库区非饱和土边坡稳定性的影响[J].水利水电技术,2013,44(7):111-115.
[8]李健,巫锡勇,侯龙.水位变动对库区非饱和路堑边坡稳定性的影响分析[J].路基工程,2014(3):90-94.
[9] MUKHLISIN M,TAHA M R,KEN’ICHIROU K. Numerical analysis of effective soil porosity and soil thickness effects on slope stability at a hillslope of weathered granitic soil formation[J]. Geosciences Journal,2008,12(4):401-410.
[10] RAHIMI A,RAHARDJO H,LEONG E C. Effect of hydraulic properties of soil on rainfall-induced slope failure[J]. Engineering Geology,2010,114(3-4):135-143.
[11] TSAPARAS I,RAHARDJO H,TOLL D G,et al. Controlling parameters for rainfall-induced landslides[J]. Computers and Geotechnics,2002,29(1):1-27.
[12] LU N,LIKOS W J. Unsaturated soil mechanics[M]. New York:John Wiley&Sons,2004.
[13] BAKER R. Tensile strength,tension cracks,and stability of slopes[J]. Soils Found,1981,21(2):1-17.
[14] LESHCHINSKY D. Slope stability analysis:generalized approach[J]. Geotechnical Engineering,1990,116(5):851-867.
[15] LU N,GODT J W,WU D T. A closed-form equation for effective stress in unsaturated soil[J]. Water Resources Research,2010,46(5):567-573.
[16] VAHEDIFARD F,LESHCHINSKY D,MORTEZAEI K,et al. Effective stress-based limit-equilibrium analysis for homogeneous unsaturated slopes[J/OL]. International Journal of Geomechanics,2016,16(6):D4016003,https://ascelibrary.org/doi/10.1061/%28ASCE%29GM.1943-5622.0000554.
[17] GARDNER W R. Some steady state solutions of the unsaturated moisture flow equation with application to evaporation from a water table[J]. Soil Science,1958,85(4):228-232.
[18] ZIENKIEWICZ O C,HUMPHESON C,LEWIS R W. Associated and non-associated visco-plasticity and plasticity in soil mechanics[J]. Geotechnique,1975,25(25):671-689.
[19] GRIFFITHS D V,LU N. Unsaturated slope stability analysis with steady infiltration or evaporation using elasto-plastic finite elements[J]. International Journal for Numerical&Analytical Methods in Geomechanics,2005,29(3):249-267.
[20] VIRATJANDR C,MICHALOWSKI R L. Limit analysis of submerged slopes subjected to water drawdown[J]. Canadian Geotechnical Journal,2006,43(8):802-814.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |