Analysis on the landslide in loess layer effected by mining subsidence

Underground mining causes land subsidence and deformation.It can induce fragmentary belts with vertical cracks along the edge of subsiding area.There are specified conditions for the occurrence of landslide,and the landslides of thick-beded loess in the Northwest China are controlled by the rock type in the bedrock-loess contact zone and the condition of rainfall.We can get the following knowledge by mechanical analysis on mechanism of land slip and its formation conditions:if there are weak rocks such as loose soil layer,phyllite,mud-stone,etc.in the disconformable belt between loess and bed rock,the loess layer would lose its stability and start to deform and slip in the condition of subsidence fragmentary belt with vertical cracks and atmospheric water seep into the loess.The slipping mass moves along the curved sliding surface in a certain depth.And the landslide of thick loess layer also causes considerable life and economic losses.The fact of landslide in Yaojie Mining area gives the example for what analyzed above.