立井冲积层含水层下伏煤层冻结施工技术

摘要

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 7.52m at 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 10m . 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.%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。