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由于地下开采活动,致使在整体块状结构坚硬岩层中产生弹性能积聚,当弹性能积聚到一定程度时,坚硬岩层产生动力失稳,瞬间释放巨大动能,致使在坚硬岩层附近的含水层中产生超高水压,并在含水层与采掘临空面之间,产生瞬间冲破导水通道,产生动力突水。以海孜煤矿为例,通过现场勘查和数值模拟分析了离层产生的地质条件和主要因素,测试了坚硬岩层的冲击倾向性指标(tD,WET,KE),并设计和实施了冲击动力作用下反应超静水压力大小的试验,在此基础上基于爆炸力学的理论初步研究了动力冲破带的形成机理。
As a result of underground mining activities, elastic energy accumulation occurs in the hard rock layers of the whole block structure. When the elastic energy accumulates to a certain extent, the hard rock layers generate dynamic instability and instantaneously release huge kinetic energy resulting in aquifers near hard rock formations Ultra-high water pressure, and in the aquifer and mining temporary surface, resulting in an instant break through the aqueduct, resulting in water inrush. Taking Haizi coal mine as an example, the geologic conditions and main factors of the detachment were analyzed through on-site exploration and numerical simulation. The impact tendency indexes (tD, WET, KE) of hard rock formation were tested and the impact dynamic force was designed and implemented Under the reaction of ultra-hydrostatic pressure test, on this basis, based on the theory of explosive mechanics preliminary study of the formation mechanism of dynamic break zone.