大气影响层含水率变化对下蜀土边坡稳定性的影响分析

针对大气影响层含水率变化对下蜀土边坡稳定性的影响,以镇江跑马山边坡中的下蜀土为试样,通过直剪试验获取了大气影响层现场含水率变化范围内下蜀土的抗剪强度指标,同时结合现场探槽试验获得大气影响深度,采用有限元极限分析软件OPTUM G2分析了大气影响层含水率变化对下蜀土边坡稳定性的影响规律。结果表明:随着大气影响层含水率的增大,下蜀土边坡的潜在滑动面逐渐从深层向浅层转变;下蜀土边坡下、上限安全系数绝对衰减率的最大值都在17%左右。

Stability Analysis of Xiashu Soil Slope under the Moisture Content Change of Atmospheric Influence Layer

The Xiashu soil slopes in Zhenjiang area collapse in different degrees caused by the moisture content change of atmospheric influence layer.The shear strength parameters under different moisture content of Xiashu soil taken from Zhenjiang Paomashan slope are measured by direct shear test.The atmospheric depth of Xiashu slope is determined by using field grooving test.On the basis of the above,the stability of Xiashu soil slopes considering the influence of water content change is analyzed by using finite element limit analysis software OPTUM.The computing results indicate that the sliding surfaces of Xiashu soil slopes gradually change from the deep layer to shallow layer with the increase of water content.The absolute attenuation rate of lower and upper limit safety factors of Xiashu soil slopes reaches about 17% with the increase of moisture content.