Fig 1.
Simplified mechanical model of roadway surrounding rock.
Fig 2.
Schematic diagram of stress measuring point layout.
Table 1.
Experimental design of mixing ratio.
Fig 3.
Working face advancement diagram under normal mining conditions.
(a) The first caving of direct roof. (b) The appearance of separation. (c) The development of cracks. (d) The first breaking of main roof. (e) The cracks develop upward and form the separation. (f) The separation further develops upward. (g). The cracks develop up to the upper plane of the model. (h) The separation is completely closed.
Fig 4.
Working face advancement diagram under normal mining conditions.
(a) Local fault activation occurs in the fault top. (b) Some cracks on one side of the fault are closed. (c) The activation range of the local fault continues to be enlarged. (d) The fault is fully activated. (e) The working face advances across the fault. (f) The roof breaks for the first time. (g) The roof breaks for the second time. (h) The model excavation is completed.
Fig 5.
Excavation distance-stress value curve.
(a) Normal excavation. (b) Through-the-fault excavation.
Fig 6.
The general situation of the working face and layout of measuring points.
Fig 7.
Schematic diagram of roadway support.
Fig 8.
The schematic diagram of roadway support adjacent to the fault.
Fig 9.
The surrounding rock deformation-time diagram.