典型构造煤区突水致灾模式及防治对策研究OA

Aiming at the difficult problems of water inrush disaster prevention and control in tectonic coal areas,based on the dynamic mechanism,water inrush disasters are divided into three types of modes:fault activation type,fissure network type,and composite type,breaking through the limitation of the traditional classification based on water sources,a three-level prevention and control system of"geological exploration-real-time monitoring-intelligent early warning"is established by systematically analyzing 36 typical water inrush cases,and differentiated governance technologies are developed for different modes:fault activation type adopts 12-15 MPa high-pressure grouting(water cement ratio 0.8∶1-1.2∶1),fissure network type implements curtain interception in a 3-5 m area(permeability coefficient<10-7 cm/s),and composite type applies 200-300 t pre-stressed anchor cable collaborative grouting.The engineering applications show that after governance,the water inrush flow rate is decreased from an average of 420 m3/h to 38 m3/h(with a decrease of 90.95%),the frequency of microseismic events is reduced from 85 times/day to 12 times/day(with a decrease of 85.9%),and the cost of prevention and control per ton of coal is decreased by 42%.Compared to the traditional method,the early warning accuracy rate of this system is improved to over 83%,achieving a technological leap from homogeneous prevention and control to targeted governance based on dynamic mechanisms.