【摘要】 为了解决柠条塔煤矿2^-2煤层顶部普遍发育的风化基岩含水层突水危险性评价难题,在分析其风化基岩发育特征的基础上,深入挖掘地质及水文地质资料,提出了能够考虑风化程度的富水性评价指标体系,包括风化影响指数、含水层厚度、渗透系数、脆塑岩厚度比、单位涌水量和岩芯采取率,并以此为依托对风化基岩含水层进行了富水性评价。以更加精确地预测顶板导水裂隙带发育高度为目标,将实测数据用于对经验公式的校正中,得出了符合研究区实际情况的导水裂隙带发育高度计算公式。根据导水裂隙带高度计算结果对顶板冒裂安全性进行分区,结合富水性评价结果,对煤层顶板风化基岩裂隙含水层突水危险性进行了预测评价。更多还原

【Abstract】 In order to solve the risk assessment of water inrush in the aquifer of weathered bedrock of coal seam roof in Ningtiaota Coal Mine,based on development characteristics analysis of the weathered bedrock,according to the geological and hydrogeological data,a water enrichment evaluation index system was proposed,including weathering index,aquifer thickness,permeability coefficient,brittle plastic rock thickness ratio,unit water inflow and core take rate,and on this basis,the water abundance evaluation was carried out on the weathered bedrock aquifer. In order to more accurately predict the height of water-conducting fractured zone of roof,the measured data was used to correct the empirical formula,and the calculation formula for the height of water-conducting fractured zone was obtained which accords with the actual situation of the study area. According to the calculated height of water-conducting zone,the safety of roof cracking is partitioned. Combined with the result of water abundance evaluation,the risk of water inrush from bedrock aquifer of coal seam roof is evaluated.更多还原