论文部分内容阅读
煤层底板突水的实质是采动应力诱发煤层底板裂隙失稳、扩展和贯通,形成突水通道,进而引发突水灾害。根据回采工作面前后支承压力分布规律,笔者建立了煤层底板应力计算模型,分析了随着回采工作面的推进煤层底板中的垂直应力和水平应力分布规律以及煤层底板的破坏形式;对煤层底板岩体进行了破坏分区,根据断裂力学理论给出了不同区域内,裂纹不同破坏模式下的张开位移表达式;采用震波检层技术验证了煤层底板采动裂隙动态的演化规律,有利于煤矿底板突水预测和突水防治措施的制订。
The essence of water inrush of coal seam floor is the instability, expansion and penetration of coal seam floor crack induced by mining stress, and the formation of water inrush channel, which in turn causes water inrush disaster. According to the law of supporting pressure distribution before and after working face mining, the authors established the stress calculation model of coal seam floor, analyzed the law of vertical stress and horizontal stress distribution in coal seam floor and the destruction form of coal seam floor with the advancing coal face, According to the theory of fracture mechanics, the expression of open displacement under different failure modes in different regions is given. The seismic wave propagation technology is used to verify the dynamic evolution of coal mining floor, which is in favor of coal mine floor Prediction of water inrush and establishment of water inrush prevention and control measures.