Study on Dynamic Disaster Mechanisms of Thick Hard Roof Induced by Hydraulic Fracturing in Surface Vertical Well

With the increase in mining depth and deterioration of conditions, thick hard overburden movement frequently induces mine earthquakes rock bursts. Some mines are expected to prevent control super through vertical ground well water fracturing technology. However, dynamic underground disaster appears more intense. Taking ‘11.30’ earthquake a Shandong Province as engineering background, mechanism an extraordinarily roof induced by hydraulic wells on was studied utilizing field investigation, accident case analysis, similar material simulation test, theoretical analysis. The main conclusions follows: (1) After ground, mode roofs changed from layer-by-layer overall sliding movement; (2) influence range advanced abutment pressure working face is reduced shaft, peak value increases. Furthermore, pressure’s far coal wall; (3) technology cross-arranged surface deep shallow cross-perforated multi-branch horizontal proposed avoid extremely fracturing. Therefore, these research results provide significance for preventing controlling bursts mines.