利用井下采空区进行水源蓄存和循环利用的地下水库技术是实现西部矿区保水采煤的有效措施,研究确定采空区的合理储水容量对于地下水库技术的安全高效实施至关重要.综合采用理论分析、模拟实验与现场实测等手段,就地下水库储水容量计算、以及极限库容与合理库容的确定等问题进行了研究,结果表明:地下水库的储水容量即为储水范围内覆岩垮落带破碎岩块间自由空隙量与裂隙带断裂岩层离层裂隙量的总和;基于覆岩垮落带类抛物空间形态模型的构建,得到了考虑煤层倾角条件下垮落带岩体空隙量的计算公式;利用覆岩采动裂隙分布的“O”形圈理论模型,获得了覆岩各层关键层底界面及相邻关键层间断裂岩层的离层空隙量确定方法;由此根据储水水位在覆岩垮裂带内的不同位置,建立了地下水库储水容量的数学表达式,形成了地下水库极限库容与合理库容的确定方法,指导了李家壕煤矿地下水库工程实践.%The utilization of underground goaf for water preservation and the underground reservoir technology for water recycling are the effective measures to achieve a water-preserved mining in western mining area of China.It is crucial for the safe and efficient implement of underground reservoir technology to research and ascertain the rational water storage capacity in the goaf.The key issues,such as the calculation of water storage capacity,the maximum and rational capacity of underground reservoir,have been investigated by theoretical analysis,stimulation experiment and field observation.It shows that the water storage capacity of underground reservoir is the summation of void content of broken rock blocks in the overlying strata caving zone and the bed separation space of broken rock strata in the fissure zone within the water storage scope.The formula for calculating the void content of rock blocks in caving zone,which considers the coal seam dip angle,has been deduced based on the shape model resembling the parabolic body in the overlying strata caving zone.By utilizing the "O-shape circle" theory,the determination method of calculating the bed separation space under each key stratum and the broken rock strata between two key strata has been obtained.Thereby,according to the different locations of stored water level in overlying strata caving zone,the arithmetic expression for calculating water storage capacity in underground reservoir has been established,and the determination method of the maximum and rational capacity of underground reservoir has also been obtained.The capability of theoretical outcomes have been demonstrated by the practice of underground reservoir in Lijiahao coal mine.
展开▼
