Analysis of Landslide Deformation in Mining Accumulation Based on Seepage-stress Coupling

A mining accumulation landslide in Lingchuan county is taken as an example, the theoretical calculation is used to deduce the water pressure difference formula of rainfall infiltration pore by considering the hydraulic slope foot factor, and the seepage-stress coupling models are used for analysis and demonstration. The results show that the underground mining is the dominant factors of the stress field adjustment of mining accumulation landslide under the condition of seepage-stress coupling, the seepage and rainfall only affects stress field adjustment range, does not affect the trend, and this kind of influence has the feature of“additivity”. Rainfall affects the distribution of effective stress in the accumulation layer by forming a transient saturated zone that varies with rainfall duration, and this process will continue to lead to the increase of effective stress in the accumulation layer after rain. Three characteristic stages of landslide instability in mining accumulation are deduced, including structural transformation, plastic fluid-tension fracture, creep-tension fracture.