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我队施工地区为湘中石炭纪测水煤系，上部覆盖壸天灰岩，厚层状，中部为梓门桥灰岩，中厚层状、煤系地层以下为石磴子灰岩。在这种地层钻进，孔漏失，以壸天灰岩为甚。多年来所遇到的溶洞大小不等，大者二十余米，小则一米左右，多数溶洞二至三米之间，有的钻孔穿过溶洞群，或从溶洞内溢出流沙，导致施工困难。多数钻孔采用下入金属套管隔绝壸天灰岩溶洞，梓门桥灰岩遇到漏失，采用常规堵漏方法即可见效。以往下入金属套管甚多，难以全部起出，造成套管浪费。1981年以来，我队试验用地勘水泥固结同经套管办法进行堵漏，效果较好，减少了套管下入量，加快了施工进度。
The construction area of our team is the Carboniferous Carboniferous Dating Coal and Water System in Hunan Province. The upper part covers the limestone in the upper part of the team and has a thick layer. The middle part is the Zimenqiao limestone. The middle layer is thick and the coal strata below is the limestone. Drilling in this stratum, the hole is lost, to the moon limestone is even more. Karst caves encountered over the years range in size, the big 20 meters, as small as about one meter, most of the karst between two to three meters, and some drilling through karst groups, or from the cave overflow sand, leading to Construction is difficult. Most of the drill holes are cut into metal limestone caves, and Zimen Bridge Limestone encounters a loss. The conventional method of plugging can be effective. In the past into a lot of metal casing, it is difficult to start all out, resulting in casing waste. Since 1981, our team experimented with the method of cementing by means of geotechnical consolidation with casing to stop plugging, which is better in effect, reducing the amount of casing entering and speeding up the construction progress.