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一、工程概况 童亭副井总深551.5米(包括23米井底水窝)。表土段300米采用钻井法施工,净径6.8米,厚600毫米的钢筋混凝土井壁。300米以下为基岩,采用普通法施工,其井筒净径6.5米,450毫米厚混凝土井壁。基岩段穿过的主要岩层有泥岩、粉砂岩、细砂岩、粗砂岩及两个薄煤层组。岩石硬度一般f=4～6,砂岩f=6～8,局部砂岩f=10。基岩段有三个含水层,采用超前钻探水和工作面预注浆措施,以实现打干井。采用长段高
First, the project overview Tong Ting vice wells total depth of 551.5 meters (including the 23-meter well bottom waterloo). Topsoil 300 meters using drilling construction, net diameter of 6.8 meters, 600 mm thick reinforced concrete shaft wall. 300 meters below the bedrock, using common law construction, the borehole diameter of 6.5 meters, 450 mm thick concrete shaft. The main rock strata through the main rock are mudstone, siltstone, fine sandstone, coarse sandstone and two thin coal seam group. Rock hardness generally f = 4 ~ 6, sandstone f = 6 ~ 8, partial sandstone f = 10. The bedrock section has three aquifers, using pre-drilling water and pre-grouting measures to achieve dry-well drilling. Long-term use of high