加筋均质边坡稳定影响因素的敏感性研究

Studies on sensibilities of factors influencing on reinforced uniform slope stability

采用正交分析表设计单指标多因素试验,通过荷兰法和瑞典法计算加筋边坡的稳定安全系数。结合 20 m 高土工格栅加筋边坡算例,分析了各因素对加筋边坡稳定影响的敏感性,按其大小依次为:粘聚力、内摩檫角、地震作用、重度、筋层数、筋材抗拉强度、坡比、筋层间距、地面超载和地下水位。重点讨论了加筋对边坡稳定的影响,并认为在边坡工程中,如果条件许可应优先采用粘聚力高、内摩檫角大的填料,需要加筋时,在总加筋力相等的前提下,铺设多层强度适中的格栅比少量高强度格栅的加筋效果好。

Based on the factors of reinforced slope computed with Holland method and Sweden method, the tests of single index and multiple factors were designed according to orthogonality table in the paper. Associated with the example of slope with the height of 20 meters reinforced by geogrids, the sensibilities of the factors influencing on the stability of slope were analysed. In sequence, the sensibilities of factors are as follows in their magnitude order: cohesion, angle of internal friction, seism, unit weight, the reciprocation of number of geogrids layers and space between layers, number and tensile strength of geogrids, slope angle space between geogrids layers, overload in top of slope and underground water level. The discussion laid emphasis on the effects of reinforcement. If possible, backfill with high cohesion and big angle of internal friction should be adopt preferentially. When reinforcements are needed, under the condition of the same total tensile strength of reinforcement, it’s better to install more geogrids with moderate strength than less ones with high strength.