电阻率法探测黄土滑坡滑动面(带)的试验研究

根据滑体与滑床土的结构差异特性,其中电阻率特性也有显著不同,利用WDJD-1型多功能数字直流激电仪和改进的探测电极装置,分别在滑坡后壁原状黄土地层、探槽及钻孔中测试黄土滑坡滑面上下各层土的电阻率值。试验结果显示电阻率测试曲线在滑动带位置出现异常跃变现象,而曲线在未滑动过的黄土地层之间变化差异不明显。这一异常突变特性,在实践中可作为鉴别滑动面位置的特征标志。该探测方法充分利用现有的勘探技术条件,操作简便,试验结果直观,可在黄土滑坡勘察实践中推广使用。

EXPERIMENTAL STUDY ON IDENTIFICATION OF SLIDING ZONE IN LOESS SLOPES WITH ELECTRICAL RESISTIVITY METHOD

Based on the different electrical resistivity characteristics between the slipped loess mass and the sliding loess bed of a landslide, the multi-purpose numerical direct-current electricity meter modeled WDJD-1 and the improved exploring electrode installment are used to measure the electrical resistivity values of losses masses above and below the sliding surface respectively. The tests are carried out in trenches and drill holes in theoriginal condition of loess stratum where landslide occurred. The test results show that the electronic resistivity test curves appear the phenomenon of exceptional jumping crossing the sliding zone. On the other hand, the change difference of the curves is not evident in the undisturbed loess stratum. This exceptionally change characteristic can be a characteristic signature to identify the sliding surface position in loess slopes. This survey method fully uses existing exploration engineering condition, it is simple in operation and can directly-observe test results. It has the potential for landslide investigation in loess slopes.