非均质各向异性加筋土边坡的抗震稳定性分析  

Seismic Stability Analysis of a Reinforced Slope in Nonhomogeneous and Anisotropic Soil

作　　者：张博宇 ZHANG Boyu(Guangxi He-Bai Expressway Co.,Ltd.,Nanning,Guangxi530000,Chin)

机构地区：[1]广西河百高速公路有限公司,广西南宁530000

出　　处：《公路工程》2018年第3期287-292,共6页Highway Engineering

摘　　要：加筋土因其良好的加固效果而被广泛应用于边坡工程。用极限分析上限方法,对非均质各向异性加筋土边坡的抗震稳定性进行研究,获得了均匀、上疏下密及上密下疏3种布筋方式下边坡临界高度的解析表达式。并用数值优化算法分析了土体非均质性、各项异性、边坡坡角、内摩擦角及地震荷载等因素对加筋土边坡稳定性的影响。结果表明:土体非均质系数、各向异性系数、内摩擦角及加筋强度的增加对边坡稳定性的提高具有积极作用,而坡角与地震荷载系数的增大则不利于边坡的稳定;3种布筋方式中,上疏下密对边坡加固的效果最佳,其次为均匀布筋方式,上密下疏的布筋方式效率较低。Reinforced soils has been widely used in slopes owing to its outstanding reinforcement effects on slope stability. Taking advantage of limit analysis method,this study conducted a seismic stability analysis of a reinforced slope in nonhomogeneous and anisotropic soil. The expressions of the critical heights of a slope under different categories of reinforcement patterns are derived,thereafter the effects of soil strength nonhomogeneity and anisotropy,the angle of slope,the internal friction angle and the seismic forces on slope stability are investigated by optimization. Result finds that the increase of the nonhomogeneity coefficient, the anisotropy coefficient, the internal friction angle and the reinforcement strength have positive effects on slope stability,while the increase of slope angle and the seismic force coefficient have negative effects on the stability of a slope. In addition,it is shown in the parameter analysis that among the three reinforcement patterns,the downwardly strong distribution pattern is the most effective choice on slope reinforcement whereas the upwardly strong distribution pattern is the most unfavorable option.

关 键 词：加筋土边坡 布筋方式 非均质性与各向异性 抗震稳定性 

分 类 号：U416.14[交通运输工程—道路与铁道工程]