考虑土体多参数非均质性及各向异性锚固边坡抗震稳定性极限分析  

Seismic stability limit analysis of reinforced soil slopes with prestressed cables considering inhomogeneity and anisotropy of multiple parameters

作　　者：夏元友[1] 陈春舒[1] XIA Yuanyou;CHEN Chunshu(School of Civil Engineering andArchiteeture, Wuhan University of Technology, Wuhan, Hubei 430070, Chin)

机构地区：[1]武汉理工大学土木工程与建筑学院,湖北武汉430070

出　　处：《岩石力学与工程学报》2018年第4期829-837,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金面上项目(51374163)~~

摘　　要：针对土体多参数非均质性及各向异性条件下的锚固边坡抗震稳定性分析,提出水平条分极限分析方法。通过水平条分将滑坡体离散为若干水平条分并视各条分内部为均质体,采用拆分法计算各水平条分的能量功率并求和代入能量方程中;根据条分各极角间的几何关系分析,选用2个极角参数作为寻优变量并采用遗传算法编程实现计算过程。基于算例分析,假设土体参数的非均质性为沿深度方向线性分布,在验证本文方法可靠性的基础上,分析边坡土体非均质性与各向异性参数变化对其抗震稳定性的影响规律。案例分析结果表明:对于屈服加速度系数而言,土体黏聚力非均质性的影响敏感性较低,采用边坡高度范围土体黏聚力的平均值来代替其非均质分布进行简化计算是可行的,而内摩擦角和土体重度非均质性的影响表现为显著的递增特征,敏感性高,采用边坡高度范围平均值代替计算结果相差较大;土体各向异性系数对屈服加速度系数的影响表现为显著的递减特征。研究成果可为实际工程中非均质各向异性边坡的抗震稳定性评估提供参考。A limit analysis based on the horizontal slice method was proposed for the seismic stability of soil slopes reinforced with prestressed cables considering the inhomogeneity and anisotropy of multiple parameters. In this method,the sliding soil mass was divided into several horizontal slices,and the soil inside each slice was treated as a homogeneous part. The energy power of each horizontal slice was calculated based on the partitioning method and was substituted into the energy equation. According to the geometrical relationship among the polar angles of the slices,two polar angles were chosen to be the optimization variables in the computational program based on genetic algorithm theory. This method was applied in a case study,where the inhomogeneity was simplified as the linear distribution along depth. The reliability of this method was verified,and the influence of the parameters concerning the inhomogeneity and anisotropy on the seismic stability were analyzed. The results of analysis indicated that the yield acceleration factor of the slope is not sensitive to the inhomogeneity of cohesive force,it is therefore feasible to use the average value of cohesive force. The inhomogeneity of internal friction angle and unit weight have remarkable effects on the yield acceleration factor. The anisotropy coefficient influences greatly the yield acceleration factor.

关 键 词：边坡工程 预应力锚索 极限分析上限法 非均质各向异性 屈服加速度系数 

分 类 号：P64[天文地球—地质矿产勘探]