条形荷载下加筋边坡稳定影响因素敏感性分析

Studies on the Sensibilities of Factors to Reinforced Slope Stability under the Strip Load

结合12 m高土工格栅加筋边坡算例,通过有限元程序Midas/GTS 4.0,对条形荷载作用下边坡加筋与未加筋时的安全系数、最大水平位移与竖向沉降进行了对比分析.根据正交分析方法对10种影响因素,即粘聚力、内摩擦角、填土重度、坡比、坡顶荷载、荷载距离坡顶处间距、荷载宽度、土工格栅长度、格栅弹性模量、格栅铺设层数对加筋土边坡稳定影响因素的敏感性进行分析,给出了各个因素的敏感性顺序.计算结果表明:土体内摩擦角、粘聚力与荷载宽度对边坡稳定性影响最为显著.

Associated with the example of slope with height of 12 meters reinforced by finite element program mi-das/GTS in this paper , the action of the reinforced and unreinforced slop under strip load , the safety factor ,the maximum horizontal and vertical displacement were compared .Based on orthogonal analysis method to analyze the sensibilities of the factors to the stability of slope with different cohesion , angle of internal friction , unit weight, slope ratio, additional loads, load from the top spot spacing, load width, length of geogrid, elastic mod-ulus of geogrid , number of geogrids layers .The sequence of sensibilities is listed and the results show that the in-ternal friction angles , cohesive and the load width are the key factors to the stability of the reinforced steep slope .