ANALYSIS OF SATURATED WATER CONTENT AND DEFORMATION OF MINE SLOPE BASED ON IMPROVED MODEL TEST

In order to predict the surface subsidence, the improved model slope test was used to record relationship between the time and volumetric water content under constant rainfall intensity. In this study, the volumetric water content is defined as the initial quasi-saturated volumetric water content (theta(iqs)). It is found that when the volumetric water content exceeds the initial quasi-saturated volumetric water content, the increase rate of volumetric water content changes again and promotes displacement. On the other hand, in order to solve the conventional experimental problem, such as the feedback of the sensors in the middle and lower parts is almost the same, making it impossible to grasp the characteristics of each point. During test, the soil layer thickness was set to 300mm to test whether the hypothesis obtained from the previous test results was valid even in the case of model improvement and soil layer thickening. The soil moisture sensors set at 5 locations in the model inclined plane were repeatedly stopped for 4 times before arriving the initial quasi-saturated volumetric water content, it was not performed that displacement occurred during this period. That is to say, in this experiment, no deformation was found before the initial quasi-saturated volume moisture content. The improved test is more complete and accurate, which well verifies the previous results and helps to understand the seepage and slope instability in detail.