采空区上覆岩层导水裂隙发育高度研究

基于毛家庄矿3煤层80203工作面地质赋存情况,通过理论分析计算采空区上覆岩层裂隙发育高度,并采用钻孔返水损失量的测试方法分析采空区上覆岩层实际裂隙情况。经理论分析与现场实测结果的对比发现:采用理论分析法中的标准公式较经验计算公式计算结果更好反应现场实测采空区覆岩裂隙发育情况,经验公式计算结果偏小于实际情况;钻孔返水损失量分析法可用于煤矿井下采空区冒落带高度测定及冒落带上方导水裂隙分布高度测定,是一种简单可靠的现场实测方法。

Study on Height of Water Conducting Development in Goaf

Thought the research method of theoretical analysis and the field experiment research method, analysised the development of caving zone and fissure zone of overlying strata in goaf with the theoretical formula calculation method, empirical formula calculation method and borehole return water measurement method according to Maojiazhuang coal mine 80203 working face of No.3 coal seam geological occurrence. The result of comparative analysis showed that:the theoretical analysis method is better responsed the field measurement for the development of overburden fissures in goaf,and the calculation results of empirical formula is less than the actul;the method of volume losses of borehole return water can be used to measure the height of caving zone and the distribution height of water-conducting fissure in caving zone,and is a simple and reliable.