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我队自1981年在水文地质钻孔中进行分层止水时,试用了铁基锥形体加粘土球组合止水法。至1983年7月上旬为止,先后共施工了基岩钻孔10个,一次止水成功率达到100％。较彻底地解决了我队长期来所存在的技术难关。一、使用的依据和具体做法 1.基岩止水的基础:多年来所遇到的情况基本上有三种:(1)砂层含砾或卵砾石以及薄层粘土等,与基岩直接接触。这样的钻孔其止水难度较大。(2)第四纪中有较厚的隔水层与基岩直接接触。(3)基岩风化带破碎漏水。
Our team tried the combined water-stopping method of iron-based conical body and clay ball when stratified sealing was performed in hydrogeological drilling in 1981. As of early July 1983, a total of 10 foundation rock drills have been constructed, and the success rate of water stoppage once reached 100%. More thoroughly solved the technical difficulties that our team has existed for a long time. First, the use of the basis and specific practices 1. Foundation of the base of the water stoppage: There are basically three kinds of situations encountered over the years: (1) sand layer with gravel or gravel and thin layer of clay, etc., and direct contact with the bedrock . Such drilling is more difficult to stop water. (2) In the Quaternary period, thicker aquifers were in direct contact with bedrock. (3) Cracked and leaking bedrock weathered zone.