布尔台矿42201工作面底板砂岩承压水防治技术

Prevention and Control Technique for Confined Water of Floor Sandstone at 42201 Working Face of Buertai Coal Mine

为了解决布尔台矿42201工作面底板砂岩承压水带压开采问题。根据勘探钻孔资料及上部22201工作面开采过程中封闭不良钻孔出水情况,分析了工作面带压开采水文地质条件。通过计算煤层底板采动破坏深度、有效保护层厚度、阻水能力及突水系数,评价了工作面带压开采威胁程度。采取直流电法探测对底板砂岩含水层富水性异常垂向、平面分布范围、特征进行探查,并对重点富水异常区域进行钻探验证及疏水降压。对工作面内钻孔封孔质量进行了评价,预计了工作面开采时封闭不良钻孔的透水量,并对封闭不良钻孔区域的底板砂岩含水层实施疏水降压及注浆改造。经注浆检查孔验证,该区域疏水降压及注浆改造效果较好,可实现工作面安全开采。

In order to solve the problems of mining under pressure of floor sandstone confined water existing at 42201 working face of Buertai Coal Mine, this paper analyzes the hydrogeology condition of 42201 working face based on the data of exploration drilling and effluent of poor sealing holes at upper 22201 working face in the process of mining. And the threatening degree of mining under pressure is evaluated through the calculation data including damage depth of destroyed floor, thickness of effective protection layer, water-resisting ability and water burst coefficient. The direct current prospecting technique is used to detect abnormal vertical and plane distribution scope, characteristics of the watery of floor sandstone aquifer, and drilling verification and draining depressurization are carried out in key water enrichment anomaly area. We also evaluated the sealing quality and predicted the permeable capacity of poor sealing holes of working face, and carried out draining depressurization and grouting measures to seal the area of poor sealing holes for floor sandstone confined water. Finally, the measures of grouting and draining depressurization have good effect though the inspection holes, and safety mining of 42201 coal face can be realized.