![]() Stress differences of the coal seam in the vicinity of the fault and both the size and stress increments of the stress concentration region of the coal seam in the footwall are used to assess the extent of the fault barrier effect. Spatiotemporal distributions of vertical, horizontal and shear stresses are obtained as the working face advances. Interface elements are used to model fault and strata contact surfaces. The fault throw is 2 m, and the working face advances toward the normal fault from the right boundary of the model on the footwall. In the model, thirteen rock strata and one normal fault whose dip is 45° are included, and the coal wall of the working face is perpendicular to the roof and floor. To study the fault barrier effect, a numerical model is built in FLAC3D and is calculated, which is based on the geological condition of the 6303 working face of Yankuang Group Jisan Coal Mine. This will increase risks of fault-slip and coal mass impact. ![]() ![]() Weakening and breaking are features of faults, impeding mining-induced stress propagation. ![]() Studies of stress distributions in the vicinity of faults are especially important for us to predict and prevent natural and mining earthquake and to analyze their mechanisms induced by fault dislocation.
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