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.