The Yahuokou landslide in Dongshan Town,Zhouqu County was selected as the research ob-ject,and the micro-motion signal of the landslide was collected and post-processed.A comparison with borehole data found that the S-wave velocity structure and apparent S-wave velocity profile obtained by single point inversion could clearly show the position of the sliding surface.The micro-motion detection results showed that the buried depth of the sliding surface of the new landslide was 10-35 m,with the average buried depth being 9.1 m,while that revealed by drilling was 10 m.The fretting detection results show that the buried depth of the old landslide sliding surface to be 15-52 m,with an average buried depth of 19.6 m,while that revealed by drilling was 20 m.The influence of geophone was also tested with different acquisition times and frequencies on the detection depth and accuracy,and it was found that in this kind of landslide a triple circular array,a 4.5 Hz geophone and a collection time of 90 min should be selected.This study showed that the microdynamic exploration method,being of a good technical advantage and application prospect,could be an effective method for detecting the landslide slip surface of the fault fracture zone accumulation layer that is widely distributed in the Bailongjiang River basin.
microtremor survey methodS-wave velocitysliding surfacelandslide of accumulation lay-er in fault fracture zoneBailongjiang River basin
维普
万方数据
