降雨条件下混合花岗岩边坡残积土工程特性衰变综合测试

Comprehensive Tests of Engineering Characteristic Decay of Residual Soil of Mixed Granite Slope Under Rainfall Conditions

混合花岗岩残积土易受扰动,导致对该类土体评价多采用现场原位测试。在雨季前、后对云南省某混合花岗岩边坡进行高密度电法、高密度面波的原位测试,结果表明,降雨后边坡残积土电阻率增大,且降雨主要影响低阻岩土体。电法、面波两种原位测试方法的结合适用于评价此类边坡工程扰动特性,该类边坡应采取边开挖、边支护的方式分级开挖,且开挖过程中应做好防降雨冲刷入渗措施。

The mixed granite residual soil is easy to be disturbed, so the evaluation method of this kind of soil is mostly in-situ testing. Before and after rainfall season, the in-situ test of high-density electrical method and high-density surface wave are tested on the mixed granite slope in Yunnan Province. The results show that the resistivity of the residual soil on the slope increases after rainfall, and the rainfall mainly affects the low-resistance rock and soil. The combination of electric method and surface wave method can be used to evaluate the change characteristics of this kind of slope after disturbance.This kind of slope should adopt the method of excavation and support at the same time in stages, and the measures to prevent rainfall erosion and infiltration should be taken in the excavation process.