基于剪切梁的地垒断层型矿震解析分析

为得到地垒组合型断层失稳诱发矿震的方式及断层影响区顶板平衡结构的解析解,将顶板简化为剪切梁模型进行分析.基于弹性剪切梁确定了顶板最大等效剪力位置和顶板初次垮落步距的计算公式.顶板等效剪力随着采空区跨度的增加而增加,达到顶板极限值时发生初次来压,顶板断裂位置出现在煤层内部.用弹塑性剪切梁模型分析存在地垒断层的采场顶板初次来压和周期来压,当最大等效剪力达到断层剪切极限时,断层错动,释放能量,发生矿震.

HORST FAULT ROCKBURST ANALYSIS BASED ON SHEAR BEAM THEORY

In order to simulate the rockburst induced by the horst combination fault instability and to obtain the analytical solution for the roof equilibrium structure in the horst combination fault influence areas, the roof is simplified into a shear beam model. Based on the elastic shear beam model, the position of the maximum equivalent shear in the roof is determined and the computational formula for the roof's first caving step is obtained. The roof equivalent shear increases with the increase of the span of the gob.The first weighting takes place when the equivalent shear reaches the top limit, and the roof fracture location appears in the interior of the coal seam. The first weighting and the periodical weighting of the roof in the stope are analyzed. In the stope, horst faults are found. And the elastic-plastic shear beam model is used in the analysis. which shows that horst faults may exist in the stope.The faults will slip, the energy will be released and the mine tremor will occur, when the maximum equivalent shear reaches the shear limit of the faults.