硬岩水文地质参数井同径止水与分层抽水试验研究  

Experimental investigation on same diameter sealing and stratified pumping of hard rock hydrogeological parameter well

作　　者：董崇泽 孙智杰 DONG Chongze;SUN Zhijie(Shanxi Institute of Energy,Jinzhong,Shanxi 030600,China;Shanxi Provincial Third Institute of Geological Engineering Investigation,Jinzhong,Shanxi,030620,China)

机构地区：[1]山西能源学院,山西晋中030600 [2]山西省第三地质工程勘察院,山西晋中030620

出　　处：《水文地质工程地质》2022年第4期55-61,共7页Hydrogeology & Engineering Geology

基　　金：山西省政府购买科技创新项目(晋地水发[2021]10号)。

摘　　要：针对传统施工程序无法解决坚硬岩石止水环隙很小(仅3 mm)钻孔的同径止水及分层抽水试验问题,以山西某水文地质参数井为研究对象,采用现场和室内综合试验的方法,对同径止水方案、材料、技术、分层抽水等工艺进行研究。结果表明:(1)同径止水装置经过特殊的“外掏内缩”设计与制作,使止水外环间隙由3 mm增大到8.5 mm,解决了“极小止水环隙”下的同径止水问题;经抽水检验,止水效果良好。(2)在孔外一系列试验的基础上,定制的止水材料和选择的止水组合与本孔的适应性强,下管风险小,实施过程相当顺利。(3)专门设计的分层导水管路,其上串接的隔离封水胶球与止水套管柱内设置的锥形隔水接头相互契合,封水可靠,形成了两套独立的导水管路,满足了上、下含水层分层抽水试验的工况。研究结果可为类似水文地质参数井开展同径止水或分层抽水试验研究提供参考。On account of the problem of the same diameter sealing and stratified pumping test in a hard rock borehole with very small water-sealing ring gap(only 3 mm)unsolved by traditional construction procedures,taking the hydrogeological parameter well located in Shanxi Province as the research object,the in-situ and laboratory comprehensive tests are employed to implement the research on the construction process of same diameter water sealing plans,materials,technology,as well as the stratified pumping test.Results show that,(1)as for the water sealing device with the same diameter,the outer of the water sealing ring gap is increased from 3 mm to 8.5 mm by special design and manufacture of“cut out and shrink in”to solve the problem of same diameter water-sealing under the situation of extremely small water sealing ring gap,which performs well via the pumping test inspection.(2)Based on the series of tests research outside the bore hole,the custom-made“sealing material”and selected“water sealing combination”have strong adaptability with the hole,and the implementation of down-pipe goes rather smooth with low risk.(3)The stratified aqueduct is specially designed,on which the concatenated isolation sealing rubber ball fit well with the conical water isolating joint set in the waterproof casing pipe.The water sealing is reliable,and two sets of independent aqueduct are formed to meet the stratified pumping test of the upper and lower aquifers.The research results can provide reference for the same diameter water sealing or stratified pumping test of similar hydrogeological parameter wells.wells.

关 键 词：硬岩深孔同径止水 外掏内缩接头 止水材料与组合 隔离封水胶球 锥形隔水接头 分层抽水 

分 类 号：P642.1[天文地球—工程地质学]