复杂突水条件下矿井注浆堵水技术

Grouting and Water Blocking Technology under Complex Conditions of Water Inrush in Coal Mine

摘要:

以桑树坪矿“8.7”突水堵水工程为例，论述了因小煤矿越界开采本矿深部煤层导致发生特大突水、在不明过水通道下的注浆堵水技术。为了在突水条件不清楚的前提下进行注浆，桑树坪矿先采用了多种探查手段，之后开展动水注浆。工程实践表明，在过水通道位置不清楚的前提下，首先要通过调查了解小煤矿的采掘情况，并结合本矿采掘系统确定截流段的大体位置；其次采用物探手段对该处过水通道进行探查，并根据物探成果使用井下钻探方法精确查明过水巷道的位置；之后展开动水截流，截流成功后再对煤层底板和奥灰岩顶部进行注浆。

Abstract:

Taking a case of water inrush in Sangshuping coal mine, the paper discussed the grouting and water blocking technology used for the special large water inrush caused by being mined beyond the approved limits with unknown water channel. The engineering practice indicates that the situation of cross-border mining must be firstly detected to determine the general location of water interception; then the water inrush channel should be detected by geophysical methods and based on the geophysical information, the water channel position is pinpointed with downhole drilling. After dynamic water interception, the grouting is carried out in the coal seam floor and the top of Ordovician limestone.