有限长生态边坡客土稳定性分析

 生态边坡工程中植物赖以生存的基质(客土)的力学稳定性至关重要，而生态边坡工程初期时客土的稳定性主要取决于其抗滑动性。一般情况下，客土长度与厚度相比往往并非足够大。针对有限长客土的抗滑动性问题，利用模型试验及极限分析上限解进行讨论。试验结果表明，客土破坏时的滑裂面上部为沿金属网上表面的一条平行于原边坡坡面的直线滑裂面，下部为与之光滑连接的一条通过支挡结构上沿的曲线滑裂面。客土越长，客土越厚，失稳时的边坡坡角越小，即越容易失稳。基于试验结果建立许可的破坏机构及速度场，给出极限分析上限解并利用试验结果进行验证。

STABILITY ANALYSIS OF BORROWED SOIL IN FINITE-LENGTH ECOLOGICAL SLOPE

The mechanical stability of substrate(borrowed soil)，which is needed for plants，is crucial to ecological slope engineering. In the initial time of ecological slope engineering，the stability of borrowed soil is mainly dependent on its characteristic of anti-sliding. In general，the length of borrowed soil is not long enough compared with its thickness. To aim at solving the sliding problem of the finite-length slope by using model test and upper-bound solution，the test results show that the upper part of the failure plane is straight，which is set along the top surface of metal gauze and parallel with original slope surface，but the lower part is a curved-failure plane connected with the upper-part smoothly and passes through the upper border of retaining structure. The longer the slope is，the smaller slope angle will be when failure occurs，which also means more easily it will fail. Based on the results of model test，the failure mechanism and velocity field are proposed；and the upper-bound solution is given and verified.