新近系松散-半胶结砂砾石含水层的注浆改造试验及效果

矿井斜井开拓安全通过新近系砂砾石含水层是一个普遍的难题，为给斜井地面预注浆或帷幕注浆法过砾石层提供依据，新矿集团在内蒙古自治区上海庙西矿区黑梁煤矿主副斜井附近对总厚20—30m的新近系砾石层（夹砂质粘土层）进行了专门注浆试验及抽水、取心等对比验证工作。结果表明。松散一半胶结砾石层虽然在超过1MPa的注浆压力“阀值”后具有一定的可注性，但浆液扩散范围小于2-3m，而且扩散方式不规则、不可控、形不成可靠的浆液扩散加固圈，对砾石层的含、导水性未发现有改善效果。通过本次试验，较好地掌握了松散一半胶结砾石层注浆性能，获得了有关注浆参数和经验，对类似地层的注浆改造和井巷工程的安全施工具有指导意义。

Neogene Loose-Weakly Cemented Sandy Gravel Aquifer Grouting Reformation Test and Effect

Safely driving through the Neogene sandy gravel is a common hard nut in inclined shaft opening out. To provide basis for surface advance grouting or concrete curtain grouting, the Xinwen Group has carried out special grouting test and pumping test, coring etc. to contrast and validated for Neogene gravel layer （intercalated with sandy clay） with total thickness 20-30m near the Heiliang coalmine main and auxiliary inclines, Shanghaimiao west mine area, Inner Mongolia. The result has demonstrated that although the loose-weakly cemented gravel layer has certain groutability beyond the 1MPa grouting pressure ＂threshold＂ , but the slurry diffusive extent is less than 2-3m; also, the diffusive mode is irregular, uncontrollable and cannot form a reliable slurry diffusive consolidated ring, thus no improved effects on gravel layer water-bearing property and transmissibility have been found. Through this test, has grappled grouting performance in loose-weakly cemented gravel layer better, and obtained related grouting parameters and experiences, thus have guiding significance in grouting reformation and underground engineering construction safety in similar strata.