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作 者:巩建雨 GONG Jian-yu(Hydrogeological Team of Hebei Coalfield Geological Bureau,Handan Hebei 056000,China)
机构地区:[1]河北省煤田地质局水文地质队,河北邯郸056000
出 处:《西部探矿工程》2024年第8期44-49,共6页West-China Exploration Engineering
摘 要:覆岩离层注浆钻孔的孔型及目标关键层的选择、孔身结构、预防采后覆岩运移导致钻孔变形破坏等是覆岩离层注浆工程的核心技术之一。对以往的注浆钻孔进行了梳理、分析、比较和总结,对工程中显示出的不足并在后续施工中得到了持续的改进与优化。实践验证直孔与定向孔相结合的孔型布置及单孔单离层、邻(排)孔异离层的多目标关键层位复合注浆是项目成功的关键。孔身结构宜采用三开设计;孔身直径应与日最大注浆量及注浆系统相匹配;一开套管超深下入基岩和采用“一种防止离层注浆首排钻孔破坏的设计方法”设计的首、末排定向孔是预防停采线侧与切眼侧注浆钻孔破坏的有效措施;检查孔可与注浆孔同孔布置,一孔双用,实现资源利用的最大化。One of the core technologies of overlying rock separa-tion grouting engineering is the selection of hole type and target key layer,hole structure,and prevention of drilling deformation and damage caused by overlying rock migration after mining.We have sorted,analyzed,compared,and summarized the previous grouting boreholes,identified the shortcomings in the project,and continuously improved and optimized them in subsequent construc-tion.Practice has proven that the combination of straight and direc-tional hole layout,as well as the multi-objective key layer compos-ite grouting of single hole and single separation layer,and adjacent(row)hole separation layer,are the key to the success of the proj-ect.The hole-structure should adopt a three-opening design,and the diameter of the hole should match the maximum daily grouting volume and grouting system.The first and last directional holes de-signed using a design method to prevent the failure of the first row of grouting holes in the separation layer and the ultra-deep penetra-tion of the casing into the bedrock are effective measures to pre-vent the failure of grouting holes on the side of the stopping min-ing line and the cutting hole.The inspection hole can be arranged in the same hole as the grouting hole,with one hole for dual use,achieving maximum resource utilization.
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