基于滑带软化的滑坡渐进破坏机制分析
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摘要
渐进式滑坡是一个由量变到质变的动态发展过程,其破坏过程和稳定性变化规律分析是滑坡分析与处理的重点和难点。对于渐进式滑坡的破坏过程,其实质是滑带的应变软化过程,利用FLAC 3D软件的应变软化本构实现渐进破坏过程模拟;对于渐进式滑坡的稳定性变化规律,结合应变软化过程并考虑强度参数粘聚力和内摩擦角的软化程度的差异,提出一种双强度折减的动态稳定性评价方法。以奉节某渐进式滑坡为例进行这两方面的数值分析,在滑坡坡脚路基开挖之后,随着塑性剪切发展,滑坡破坏呈现由坡脚向坡顶扩展的渐进式发展规律。二者结果对比互补,验证了两种方法的合理性,很好地实现了渐进式滑坡的破坏机制分析。
Progressive landslide is a dynamic development process from variable to qualitative change. Its failure process and stability analysis are the key and difficult points of landslide analysis and treatment. For the gradual failure process of progressive landslide,it is the strain softening process of sliding zone,and the strain softening constitutive method of FLAC 3D software is used to simulate the progressive failure process. For the stability analysis of progressive landslide,combining with the strain softening process and considering the difference between the softening degree of the strength parameter cohesion and the internal friction angle,a dynamic stability evaluation method of double safety factor strength reduction is proposed. Taking the progressive landslide of Fengjie as an example,the numerical analysis of these two aspects is carried out. After the excavation of the embankment of the landslide,with the development of the plastic shear,the landslide failure shows the progressive development of the slope from the foot to the top of the slope. The results of the two methods complement each other,verify the rationality of the two methods,and realize the analysis of the breaking mechanism of the progressive landslide.
Progressive landslide is a dynamic development process from variable to qualitative change. Its failure process and stability analysis are the key and difficult points of landslide analysis and treatment. For the gradual failure process of progressive landslide,it is the strain softening process of sliding zone,and the strain softening constitutive method of FLAC 3D software is used to simulate the progressive failure process. For the stability analysis of progressive landslide,combining with the strain softening process and considering the difference between the softening degree of the strength parameter cohesion and the internal friction angle,a dynamic stability evaluation method of double safety factor strength reduction is proposed. Taking the progressive landslide of Fengjie as an example,the numerical analysis of these two aspects is carried out. After the excavation of the embankment of the landslide,with the development of the plastic shear,the landslide failure shows the progressive development of the slope from the foot to the top of the slope. The results of the two methods complement each other,verify the rationality of the two methods,and realize the analysis of the breaking mechanism of the progressive landslide.
引文
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[14]杨光华,钟志辉,张玉成,等.用局部强度折减法进行边坡稳定性分析[J].岩土力学,2010,31(A2):53-58
[15] CHEN G Q,HUANG R Q,XU Q,et al. Progressive modelling of the gravity-induced landslide using the local dynamic strength reduction method[J]. Journal of Mountain Science,2013,10(4):532-540.
[16]唐芬,郑颖人,赵尚毅.土坡渐进破坏的双安全系数讨论[J].岩石力学与工程学报,2007,26(7):1402-1407.
[17] Itasca Consulting Group,Inc. FLAC 3D:Fast Lagrangian Analysis of Continua in 3 Dimensions Theory and Background[M]. Minneapolis:Itasca Consulting Group,Inc.,2015
[18] ZHANG K,CAO P,BAO R. Progressive failure analysis of slope with strain-softening behaviour based on strength reduction method[J]. Journal of Zhejiang University Science A(Applied Physics&Engineering),2013,14(2):101-109.
[2] SKEMPTON A W. Long-term stability of clay slopes[J].Geotechnique,1964,14(2):77-101.
[3] LAW K T,LUMB P. A limit equilibrium analysis of progressive failure in the stability of slopes[J]. Canadian Geotechnical Journal,1978,15(1):113-122.
[4] MIAO T D,MA C W,WU S Z. Evolution model of progressive failure of landslides[J]. Journal of Geotechnical and Geoenvironmental Engineering,1999,125(10):827-831.
[5]王庚荪.边坡的渐进破坏及稳定性分析[J].岩石力学与工程学报,2000,19(1):29-34.
[6] ZHANG G,ZHANG J M. Simplified method of stability evaluation for strain-softening slopes[J]. Mechanics Research Communications,2007,34(5-6):444-450.
[7]袁从华,童志怡,卢海峰.牵引式滑坡特征及主被动加固比较分析[J].岩土力学,2008,29(10):2853-2858.
[8]谭福林,胡新丽,张玉明,等.牵引式滑坡推力计算方法研究[J].岩土力学,2015,A2:532-538.
[9] LU Y F. Mechanism and stability analyses of progressive failure of pull-type landslide[C]//Proceedings of the 3rd Academic Conference of Geology Resource Management and Sustainable Development. Wuhan:[s. n.],2015:281-291.
[10]胡志杰.边坡渐进破坏理论在陈家岭滑坡治理中的应用[J].公路工程,2017,42(2):199-204.
[11] Siqing Qing,Jiu Jimmy Jiao,Sijing Wang. A Nonlinear Catastrophe Model of Planar-slip Slope and Chaotic Dynamical Mechanisms of Its Evolutionary Process[J]. International Journal of Solids and Structure,2008,Vol. 38,8093-8109.
[12]薛海斌,党发宁,尹小涛,等.基于动力学和材料软化特性的边坡渐进破坏特征研究[J].岩土力学,2016,37(8):2238-2246.
[13]魏斌,朱自强.岩质边坡滑带参数取值方法和稳定性分析[J].公路工程,2009(3):123-126.
[14]杨光华,钟志辉,张玉成,等.用局部强度折减法进行边坡稳定性分析[J].岩土力学,2010,31(A2):53-58
[15] CHEN G Q,HUANG R Q,XU Q,et al. Progressive modelling of the gravity-induced landslide using the local dynamic strength reduction method[J]. Journal of Mountain Science,2013,10(4):532-540.
[16]唐芬,郑颖人,赵尚毅.土坡渐进破坏的双安全系数讨论[J].岩石力学与工程学报,2007,26(7):1402-1407.
[17] Itasca Consulting Group,Inc. FLAC 3D:Fast Lagrangian Analysis of Continua in 3 Dimensions Theory and Background[M]. Minneapolis:Itasca Consulting Group,Inc.,2015
[18] ZHANG K,CAO P,BAO R. Progressive failure analysis of slope with strain-softening behaviour based on strength reduction method[J]. Journal of Zhejiang University Science A(Applied Physics&Engineering),2013,14(2):101-109.