基于我国华北煤电煤层底板太灰含水层富水性具有明显的差异性,在特定条件下可作为隔水层,为了准确确定底板隔水层厚度,预测底板突水危险性,结合新义煤矿首采区二1煤底板实际情况,运用物探、钻探等手段对其灰岩富水性进行探查分析。结果表明:该矿首采区底板灰岩可作为隔水层,从而将底板隔水层平均厚度增加至54 m左右,运用突水系数法评价得出首采区大部分区域的突水系数均小于正常块段临界突水系数0.1 MPa/m,在前期底板注浆加固基础上可以实现安全带压开采。

Based on the obvious differences in the watery of Taiyuan limestone aquifer under the floor of North China Mining Area, under the certain conditions, the aquifer could be a water isolation layer.In order to accurately determine the thickness of the water isolation layer under the floor and to predict the water inrush dangers from the floor, in combination with the actual conditions of No.21 seam floor in the first mining block of the Henan Xinyi Mine, the geophysical exploration, drilling explor ation and other means were applied to the survey and analysis on the watery of the limestone.The results showed that the floor limestone of the first mining block in the mine could be considered as a water isolation layer, thus the thickness of the floor water isolation layer could be increased to about 54 m in average. The water inrush C oefficient method was applied to evaluate and obtain the water inrush coefficient value of the major area in the first mining block all below the critical water inrush coeffi cient of 0.1 MPa/m in the normal section.Based on the previous floor grouting and reinforcement, a safety mining above the pressurized water could be realized.

国家重点基础研究发展计划(973计划)资助项目(2007CB209406)；