超深部土体地面高压射孔注浆现场实测研究

Field measurement study on ground perforation grouting for ultradeep soil

根据鲍店煤矿井壁破裂灾害治理注浆工程的实践,对适合于超深部土体(超过100 m)的钻孔上行式聚能射孔注浆施工工艺进行了完整的描述,指出实际工程中容易发生的工程事故,并提出改进措施和注意事项;对整个注浆期间的压力变化情况进行了现场实测研究,并引入“水压致裂理论”对裸孔段注浆进行了理论对比分析;运用“裂隙扩展的能量分析原理”阐述了劈裂注浆的流量调节法。最后根据钻探取芯资料和实际工程中观察到的现象,从侧面对单孔注浆时浆液在深部地层的扩散方式与范围进行了推断。得出的实测数据与结论对今后类似超深部土体注浆工程的设计与施工有重要参考价值。

According to the practice of grouting engineering of Baodian mineshaft lining fracture treatment, the construction technology of bottom-up perforation grouting suitable for ultradeep (not less than 100 meters) soil ground grouting is described in detail, the most commonly-encountered engineering accident is pointed out and the accident prevention method is proposed. The grouting pressure is studied by field measurement; then the hydraulic fracturing theory and the energy analysis principle for fracturing are used to analyze gymnostomous grouting and the flux control method is applied for fracturing grouting and range. At last, diffusing way of the single bore grouting are deduced by drilling-core and some engineering phenomenon. The data and conclusion presented in this paper are valuable as a reference for design and construction of similar grouting projects.