Similar simulation test study on overburden strata migration in areas affected by fault clamping under mining conditions

In order to explore the influence of area affected by fault clamping on the overburden strata migration under mining conditions, based on the mining geological conditions of the 6305 fully mechanized mining face of Xinjulong Coal Mine, the overburden strata structure, displacement characteristics and fault activation characteristics before, during and after mining from the face to the area affected by fault clamping were analyzed by using indoor simulation method. The research results show that before the 6305 fully mechanized mining face passes through the F311 and XF2 faults, the arch structure was formed after overlying rock failure. When mining to F311 and XF2 faults, due to the fault cutting effect, the "arch" overburden structure showed peculiarity and the development of the "arch" overburden structure was discontinuous. After mining fault F311, the arch foot of the "arch" overlying rock structure fell on the low rock layer of the footwall, and the stress at the arch foot increases, resulting in the overall cutting of the low rock layer. After mining fault F311, a new strange "arch" overlying rock structure was formed between the working face and XF2 fault. When the working face 6305 started mining, the F311 fault first showed activation characteristics. When the working face was pushed to the F311 fault, the maximum subsidence displacement of the lower strata was 9.0 m, while the upper strata had no subsidence displacement. In this case, the F311 fault was activated significantly at the lower strata while the upper strata did not activate. When the working face was pushed to the XF2 fault, the maximum subsidence displacement of the lower strata was 7.8 m, while the upper strata had no subsidence displacement. In this case, the XF2 fault was obviously activated at the lower strata, while the upper strata was not activated.