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在提出任意三维滑动面搜索方法的基础上,针对滑动体非对称情况(包括准线不对称和长度不对称)、母线不在滑动体内沿滑动方向断面尺寸最大的面上、土坡含软弱夹层的情况,采取了一些解决措施,并将其应用于工程上常见的填挖方复合土坡、水平分层填方路堤、公路纵断面为平斜坡的土坡和含软弱夹层的土坡这4种算例中。分析表明:①此方法可以对一些较复杂条件下的土坡进行稳定性分析,并能够寻找到较优的最危险滑动面(包括整体和局部稳定性);②当填挖边坡上填方段和挖方段的材料不一致时,更容易在抗滑稳定性差的材料处发生失稳,但当填方段和挖方段的材料重度γ相同时,两种材料的φ/c是否相等在一定程度上对滑动体的对称性和大小有影响;③对于公路纵断面为平斜坡的土坡,其潜在最危险滑动面更倾向于平坡段,斜坡对边坡的稳定系数有一定的积极影响;④在含软弱夹层的土坡中,当滑动体的长度无限长时,其三维稳定性趋于二维稳定性,与以往研究成果相比较时,得出本文方法计算出的结果与之非常接近,说明本文方法可行。
On the basis of the proposed method of searching arbitrary three-dimensional sliding surface, in view of the asymmetry of the sliding body (including the quasi-line asymmetry and length asymmetry), the busbar is not located on the surface of the sliding body with the largest cross-sectional dimension in the sliding direction. Some measures are taken to solve these problems and apply them to the four kinds of earthwork slopes which are commonly found in engineering, such as compound earth slope cut by filling and excavation, embankment with horizontal stratified filling, vertical slope with straight slope and earth slope with weak interlayer Example. The analysis shows that: (1) This method can analyze the stability of slopes in some complicated conditions and find out the best and most dangerous sliding surface (including overall and local stability); (2) When the materials of the section and the excavation section are inconsistent, it is easier to instability in the material with poor antislip stability. However, φ / c of the two materials are equal to each other when the material γ of the filling section and the excavation section is the same Which has influence on the symmetry and size of the sliding body. (3) For the slope with vertical slope, the potential most dangerous slip surface is more inclined to the flat slope. The slope has certain positive influence on the slope stability coefficient. (4) In the soil slope with weak intercalation, when the length of the sliding body is infinite, the three-dimensional stability of the sliding body tends to two-dimensional stability. Compared with the previous research results, the results obtained by this method are very close , Indicating that this method is feasible.