Study on Control Technology for Working Faces Passing through Long-Span Abandoned Roadways

<div>The deformation of the overlying strata in the model. (a) The width of coal between the working face and abandoned roadway is 3.45 m. (b) The working face is connected with the roof caving area. 1—crack width increased; 2—rotary subsidence of rock block.</div>

Geofluids

fig4

Figure 4

Figure 4: Study on Control Technology for Working Faces Passing through Long-Span Abandoned Roadways 