马堡矿15^#煤带压开采数值模拟研究

针对马堡矿地质构造复杂,主要岩溶含水层富水性强,下组煤距下伏奥灰很近,煤层开采面临着奥灰突水严重威胁的情况,运用数值模拟的方法,研究了工作面斜长对底板破坏规律与突水机理的影响,并对15号煤带压开采进行了安全性评价。研究结果表明:工作面斜长分别取160 m与110 m时开采15号煤产生的采动破坏带均会与承压水导升带贯通,隔水层丧失阻隔水性能进而导致底板突水,而工作面斜长为60 m时则不会发生底板突水。因此,可通过采取控制工作面斜长的方法提高带压开采的安全性。

Numerical Simulation Research on Safe Mining of No.15 Coal under Water Pressure of Aquifer in Mabao Coal Mine

In view of the complex geological structure of the Mabao Mine,the main karst aquifer is water-rich,the lower coal is very close to the underlying Ordovician,and the coal seam mining is facing a serious threat of water inrush from the Ordovician.The method of numerical simulation is used to study the influence of length of the working face in inclination on the damage law of the floor and the mechanism of water inrush,and the safety evaluation of No.15 coal under pressure mining is also carried out.The research results show that the water barrier belt will lose effect when the length of the working face is at 160 m and 110 m,respectively,which means water would penetrate the confined barrier belt through conduction belt,but no water inrush from the floor occured when the working face is 60 m long,therefore,the safety of mining under pressure can be improved by taking the method of controlling the inclined length of the working face.