水平成层土质边坡破坏机理研究

Mechanism of Horizontal Layered Soil Slope Failure

针对水平成层土质边坡的成层特性,建立室内模型试验模拟其承载特性以及破坏机理,运用FLAC3D数值模拟技术与室内模型试验相互验证分析,得到了层状边坡在坡顶加载情况下的荷载-位移规律、极限承载力、滑动面形态和位置。研究结果表明,极限承载力随分层厚度的增大而增大,而边坡高度对极限承载力的影响甚微。再运用FLAC3D数值模拟技术进行拓展分析,利用成层土坡与均质土坡破坏机理的联系得到了成层土坡剪出高度与加载宽度以及坡比的关系,同时得到了水平成层土坡不同破坏模式的临界坡比,所得结果对实际工程具有一定的参考意义。

For horizontal layered soil slope into a layer characteristics, establishes model tests to simulate the bearing characteristics and failure mechanism. By means of the mutual verification analysis ofFLAC3D numerical simulation and indoor model tests, gets load - displacement law, ultimate bearing capacity and the sliding surface shape and position under the top loading of layered slope. The results show that the ultimate bearing capacity increases with the layer thickness increment, and the influence of slope height to the ultimate bearing capacity is minimal. Applies FLAC3D for expand analysis and uses the contact of failure mechanism between layered slope and homogeneous slope to obtain the relationship between layered slope cut height with load width and slope ratio, meanwhile obtains the critical slope ratio in different failure modes. The results have certain reference sianificance to the actual project.