Abstract：To study the failure law of mining overburden under different thickness of loose layer, FLAC3D numerical simulation and theoretical calculation were used to analyze the failure height of caving zone and water flowing fractured zone under different loads. The results showed that when the load was 0, the collapse mining ratio was 12.5, and the crack mining ratio was 42.5 ; when the load was 2 MPa, the collapse mining ratio was 13, and the crack mining ratio was 86.5 ; when the load was 4 MPa, the collapse mining ratio was 13, and the crack mining ratio was 116.5 ; when the load was 6 MPa, the collapse mining ratio was 13.5, and the crack mining ratio was > 125 ; with the increase of load, the height of caving zone was basically unchanged, the height of water flowing fracture zone increased gradually, and the change rate decreased gradually. The theoretical calculation results showed that the collapse mining ratio was 2.2 ~ 4.6, and the crack mining ratio was 10.7 ~ 16.3 ; the empirical formula for predicting the height of ' two belts ' did not consider the effect of load ( buried depth ), and the theoretical calculation results of the height of ' two belts ' were quite different from the numerical simulation results.
阚雪冬. 载荷作用下“两带”发育高度规律研究[J]. 煤炭与化工, 2023, 46(8): 67-70.
Kan Xuedong. Law study on the development height of “two zones” under loads. CCI, 2023, 46(8): 67-70.
