非均质和各向异性裂缝边坡稳定性分析  

Stability Analysis of Cracked Slopes with Nonhomogeneity and Anisotropy of Soil Strength

作　　者：梁承龙[1] 刘芳[1] LIANG Chenglong;LIU Fang(College of Civil Engineering and Architecture,Guangxi Transport Vocational and Technical College,Nanning 530023,China)

机构地区：[1]广西交通职业技术学院土木建筑工程学院,南宁530023

出　　处：《结构工程师》2022年第3期131-137,共7页Structural Engineers

摘　　要：针对非均质及各向异性裂缝边坡稳定性分析,在破坏机构中引入一条竖直张拉裂缝,采用极限分析上限定理并考虑孔隙水压力作用,建立能量平衡方程求解裂缝边坡稳定系数上限解。通过算例进行对比验证,同时探究土体非均质性和各向异性对裂缝边坡稳定性以及裂缝深度和位置的影响规律。结果表明,孔隙水压力的存在会降低边坡稳定性;边坡稳定性随非均质系数的增大呈线性增大,且随各向异性系数增大而减小。裂缝中存在水会导致裂缝深度增加;裂缝深度随着非均质系数和各向异性系数减小而增大,而各向异性系数对裂缝位置的影响可以忽略不计。Aiming at the stability analysis of cracked slopes with nonhomogeneous and anisotropic soil under the action of pore water pressure,the upper bound theorem of limit analysis is adopted to introduce a vertical tension crack in the failure mechanism,and an energy balance equation is established to solve the upper limit of the stability coefficient of the cracked slope.Comparative analysis is carried out through calculation examples,and the influence of soil nonhomogeneity and anisotropy on slope stability and the depth and location of cracks is also explored.The results show that the pore water pressure will reduce the slope stability;the stability coefficient increases with the increase of nonhomogeneity coefficient,and decreases with the increase of anisotropy coefficient.The presence of water in the crack will lead to an increase in crack depth.The crack depth increases with decreasing nonhomogeneity coefficient and anisotropy coefficient,while the effect of anisotropy coefficient on crack location is negligible.

关 键 词：边坡稳定性 极限分析 孔隙水压力 裂缝 非均质性 各向异性 

分 类 号：TU43[建筑科学—岩土工程]