基于综合分析法的疑似封闭不良钻孔探查

Exploration of suspected poorly sealed borehole based on comprehensive analysis method

以老公营子煤矿73159疑似封闭不良钻孔为研究对象,采用抽水试验与示踪试验相结合的综合分析法探查73159钻孔是否导通第四系含水层水进入井下采空区。在73159钻孔周边施工探查钻孔,利用第四系含水层抽水试验过程中地下水流场变化特征,分析封闭不良钻孔周边第四系含水层是否出现明显的降落漏斗;并在疑似封闭不良钻孔附近钻孔投入碘化钾示踪剂,开展示踪试验测试井下出水点水质特征。研究结果表明:抽水试验过程中紧邻73159疑似封闭不良钻孔的S2观测孔水位未出现明显的下降,初步判断73159疑似封闭不良钻孔未形成导水通道;采空区水、第四系含水层水中Na+含量及矿化度差异较大,且示踪试验采取的采空区水中碘离子含量小于12×10^(-9),碘离子含量极其微小,进一步表明73159疑似封闭不良钻孔未构成导水通道使第四系含水层水涌入采空区。

A comprehensive analysis method combining pumping test and tracer test is adopted to investigate whether 73159 suspected poorly sealed borehole as artificial water conducting channel between Quaternary aquifer and mined-out area in Laogongyingzi mine. Exploratory borehole were constructed around 73159 borehole, it was analyzed whether there was obvious cone of depression of Quaternary aquifer around poorly sealed borehole by the variation characteristics of groundwater flow field in the pumping test. Potassium iodide tracer was put into borehole near the suspected poorly sealed borehole, and the trace test was conducted to test water quality characteristics of the underground outlet point. The research results show that there is no significantly decrease of S2 observation borehole next to 73159 suspected poorly sealed borehole during the pumping test, which could preliminary indicate that 73159 suspected poorly sealed borehole is not water channel between Quaternary aquifer and mined-out area. The salinity and content of Na+in goaf water and Quaternary aquifer water are significantly different;the iodide concentration in goaf water adopted by the tracer test is less than 12 ×10^(-9), which is extremely small. It shows that 73159 suspected poorly sealed borehole did not constitute a water channel to flood the Quaternary aquifer into the goaf.