Abstract: The laws and differences of the load transmission of the basic roof over the gob area of the fault’s two sides have been studied under the condition of different mining sequence of hanging wall and foot wall, based on the articulated balance theory of the fracture rock mass, with the roadway being arranged along the boundary of the fault. And the characteristics of ground pressure of fault coal pillar and the mining gateway nearby have been studied with the method of field test. The study has shown that the load transmitting coefficient of fault is relatively higher, the hanging wall of coal pillar abutment pressure is low and that the foot wall coal pressure is relatively higher when the hanging wall of fault is firstly mined. However, the load of transmitting coefficient of fault is related with the angle of fault when the foot wall is firstly mined. When the angle of fault is larger, the load of the gob area overlying strata can be transmitted to the hanging wall, so the foot wall of coal pillar abutment pressure is low and the hanging wall coal pressure is higher; while the angle of fault is smaller, the load of the gob area overlying strata can hardly be transmitted to the hanging wall, so the foot wall of coal pillar pressure is higher and the hanging wall coal pressure is relatively lower. Therefore, different widths of the fault coal pillar should be considered according to different mining sequences.

Key words: main roof, fault, mining sequence, pressure transmission, pillar pressure