奥灰顶部相对隔水性及其在底板突水评价中的应用

Relative water resistance of Ordovician limestone roof and its application in water inrush evaluation in floor

为了探索王坡煤矿石炭系煤炭资源安全开采问题,根据奥陶系顶部存在相对隔水层并可作为隔水关键层的观点,采用电子窥视法、钻孔声波法、吕荣法压水试验和沉积学理论等综合研究措施,对王坡煤矿奥灰峰峰组顶部50 m范围内岩层的相对隔水性进行论证。在此基础上,选取一定的安全储备系数,得出相对隔水层的最小厚度。将奥陶系顶部相对隔水层作为整个煤层底板隔水层的一部分,运用突水系数法对15#煤层底板突水危险性进行评价,使评价结果更符合实际,将缓采区和禁采区煤炭资源转换为可采区资源,释放煤炭资源1.1亿t。

In order to explore the safe exploitation of Carboniferous resources in Wangpo Mine,according to the view that the top of the Ordovician system had a relative water-resisting layer and could be used as a key layer for water separation,the relative water isolation of rock strata in the 50 mrange at the top of the Wangpo Mine was demonstrated by means of electronic peeping method,drilling sound wave method,Lugeon method pump-in test and depositional theory.Based on that,the minimum thickness of water-resisting layer was obtained by selecting a certain safety reserve coefficient.As a part of the bottom layer of coal bed in the Ordovician system,the water inrush coefficient method was used to evaluate the risk of water inrush in the floor of coal bed of No.15 coal seam,so as to make the evaluation results more realistic.The data of coal in slow mining area and forbidden mining area were converted into recoverable area and 110 million tons of coal resources were liberated.