IMAGE CHARACTERISTICS ANALYSIS OF SURFACE CRACKS IN SEEPAGE DEFORMATION OF EXPANSIVE SOIL SLOPE

It is an important way to accurately grasp the development mechanism and image characteristics of cracks and deduce the formation process of expansive landslide. In this paper,the expansive soil slope in Pishihang irrigation area of Anhui Province was taken as the research object. The in-situ test under the condition of rainfall plus dead weight was carried out to systematically study the image characteristics of soil surface cracks during the instability process. The emphasis was on the analysis of the relationship between the variation of crack degree,crack geometric characteristic parameters and slope instability. The results show that it is feasible to evaluate the slope risk through comprehensive analysis of soil surface crack images. In view of the expansive soil slope in this area,when the transverse cracks along the soft structural plane develop into the main control cracks,the slope would appear abnormal,and the early warning should be put forward.