Review of the research on mechanical properities of broken rock in the deep mining

With the booming domestic economy and increasing demand for energy, shallow resources are declining and the domestic mining resources have entered a deep coal mining. During the coal mining, the common method of natural cross-fall method in the mining is adopted generally. The broken rock formed by the cross of immediate roof cross bears the load of the main roof and other various rock. In which the broken rock in deep high stress, high osmotic pressure, high moderate special environment, along with the mechanical properties of deep rock was different from the mechanical behavior of the shallow rock. This paper analyses the stress state, deformation and seepage-creep of deep broken rock, and prospect the research trend of deep broken rock.