钻孔压水试验预测井筒涌水量的研究与实践

基于煤矿凿井施工前需注浆减小井筒涌水量，为准确检验顾桥矿副井注浆堵水效果，利用压水试验和抽水试验2种方法求得该井筒岩层的渗透系数，并采用承压转无压完整井大井法公式分别计算了井筒注浆后的剩余涌水量。试验结果表明：压水试验预测井筒涌水量3．690m^3／h，抽水试验预测涌水量4．660m^3／h。井筒实际开凿涌水量为3．708m^3／h，经比较，压水试验预测涌水量与井筒开凿后实际涌水量相差0．018m^3，比抽水试验结果更为接近实际涌水量。因此，采用压水试验对含水层井筒涌水量进行预测是实用可靠的，且工艺简单，施工工期短、费用低。

Study and Practices on Mine Shaft Water Inflow Value Predicted with Borehole Water Pressure Test

Due to the mine shaft water inflow quantity should be reduced before the mine shaft sinking operation conducted,in order to accurately inspect the grouting water sealing effect of the mineauxiliary shaft in Guqiao Mine,the water pressure test and the water pumping test were applied to obtain the permeability coefficient of the rock strata in the mine shaft and the pressurized and no pressure whole shaft big well method formula was applied to calculate the residual water inflow value individually after the mine shaft grouting completed.The test results showed that the mine shaft water inflow value estimated with the water pressure test was 3.690 m3/h and the water inflow value estimated with the water bumping test was 4.660 m3/h.The water inflow value of the mine shaft actual sinking was 3.708 m3/h.In comparison,there would be 0.018 m3 between the water inflow value estimated with the water pressure test and the actual water inflow value after the mine shaft sinking and the water bumping test results would be more close to the actual water inflow value.Therefore,the water inflow value of the mine shaft from the aquifer estimated with the water pressure test was reliable,the estimation technique would be simple,the construction period was short and the cost was low.