Analysis Of Influencing Factors To Side Slope Stability Of Half-filled

Influencing factors of side slope stability are complicated and diversified, including the natural ones and also some anthropic factors. In the mountain area, filled side slopes in the places such as the highroad and railroad are filled up on natural slope. By choosing typical cross sections and using the FLAC numerical simulation method, this article analyzed the influencing factors to the stability and deformation mode of the side slope which is filled up on the natural slope.(1) According to the research goal, build a cross-section of the slope model which is made up of original slope, filling body, and the boundary zone between them.(2) Calculated the sensitivity of the impacts of the slope stability by selecting the relevant formula and analyzing the sensitivity of soil parameter influencing on the slope stability. The results show that the impact of internal frictional angle is far more bigger than the other parameters. The sensitivity of density and cohesive strength lie in the next place. And the elastic modulus and poisson ratio are the smallest ones.(3) Analyzed the formation mechanism of the boundary zone, and then did a compare between the stabilities which excluding boundary zone and including boundary zone. The result turns out that water is the key incentive which leads to the evolution from separatrix to boundary zone; Thanks to the boundary zone, the safety margin of slope stability will be reduced from1.16to1.01. And the possibility of filling body’s integrity slip along the boundary zone will obviously increase.(4) By comparing the slope stabilities of different original slope shape, position of original slope toe, filling gradient and filling length, studied their influences to the stability and deformation mode. The results show that for every one of them, with the change of their values, the speed of safety margin and the mode of slope failure(filling body internal instability or whole sliding of embankment along the boundary zone) will have corresponding changes.(5) By selecting the relevant formulas and calculate the sensitivity of the impacts of position of the original slope toe, filling gradient and filling length that to slope stability. The outcome shows that their sensitivities are0.097,0.441and0.301。(6) Compared the stabilities of vertical filling slope and homogeneous filling. The result shows that under the same degree of density, it is propitious to the slope stability that filling the larger stone to the lower layer and slope toe, and the smaller stone and soil filling to the upper.