立井冲积层含水层下伏煤层冻结施工技术

Freezing Construction Technology of Seam under Aquifer in Alluvium of Mine Shaft

新河煤矿新副立井冲积层厚216.5m。冲积层底部有1层7.52m厚的砾石含水层,地下水流速达18.048m/d,其下为10m厚的煤层。煤层含水不均匀,可冻性差,仅依靠冻结封水通过煤层,有较大风险。最终经研究,决定在维持冻结的同时,打金属骨架和注浆作超前支护,短段掘砌,强行通过煤层。方案实施后,取得圆满成功。

A thickness of an alluvium in a new mine auxiliary shaft of Xinhe Mine was 216.5m.There was a gravel aquifer with a thickness of 7.52 mat the bottom of the alluvium,the underground water flow velocity was 18.048m/d and under the gravel aquifer,there was a seam with a thickness of 10 m.The water content of the seam was uneven,the freezability was poor and only to rely on the freezing water sealing passing through the seam would have a high risk.Finally after the study conducted,it was determined that while a freezing operation was kept,the shaft was forced to pass through the seam with the metal frames and grouting as a pilot support as well as excavation and lining conducted in a short section.After the plan was completed,a full success was obtained.