堤坝滑坡区土性试验和灾害治理

对某泵站进水渠堤坝滑坡区内外的土体进行了静力触探试验和十字板强度试验,比较了滑坡区软土的天然强度和滑坡后强度,确定了滑动面深度。对施工期的边坡稳定进行了圆弧滑动和非圆弧滑动计算,结果表明边坡稳定受含有机质夹层的非圆弧滑动的控制,当使用快剪强度指标、井点降水失效时,边坡处于失稳的临界状态。最后,对堤坝滑坡提出并实施了真空预压治理方案,方案实施后进行了效果检测,确定软土强度已超过稳定要求值,加固效果明显。

Tests of soil in landslide area of embankment and disaster control

Firstly,CPTs and vane strength tests are performed for soil at landslide area of intake canal embankment of Taipa River pump station,then the natural strength of soft clay and its strength after slide is compared,giving the depth of sliding surface.Secondly,the slope stability in construction period is calculated with circular arc-and non-circular arc sliding surface and the results indicate that the slope stability is controlled by the noncircular sliding surface including organic interlayer.The slope is in unstable state when quick shear test strength indexes are used and drainage by well point is invalid.Finally,a vacuum-preloading control plan is proposed and implemented.The inspecting result shows that the soft clay strength exceeds stability request value.The treatment effectiveness is outstanding.