裂隙含水层水平孔注浆“三时段”浆液扩散机理研究及应用

Study and application of three-stage seriflux diffusion mechanism in the fissure of aquifer with horizontal injection hole

邯邢矿区是典型的华北型煤田大水矿区,其深部的大采深高承压水矿井采用地面区域超前治理奥灰水害系列技术,其中多分支近水平定向钻探及注浆是实现区域超前治理水害的关键技术。此前对注浆浆液扩散机理研究很多,但都是以垂向注浆孔及水平裂隙建立水动力学与岩石力学研究模型。地面区域治理奥灰水害是水平注浆孔高压注浆,为此开展了奥灰裂隙岩体高承压水的水平注浆孔浆液扩散机理研究,提出了注浆"三时段"的划分,并给出水动力学表达式;分析了垂向裂隙面上浆液圆环扩散形态;建立了垂向裂隙中浆水分区水动力学模型,推导出浆液扩散半径与注浆压力间关系;在有可注性差的上边界条件下,对浆液扩散形变问题给出数值模拟方法;为水平孔注浆初设及注浆参数优化提供了理论和技术指导,在邯邢矿区应用效果明显。

Mining area of Handan and Xingtai is one of the typical coalfields with a high risk of water leakage in north-east China. The technology used to prevent the water leakage in the shafts with large depth and high water pressure isto pre-dispose the water leakage in the Ordovician limestone from ground surface,namely the multiple branches hori-zontal directional drilling and grouting technology. Though the seriflux diffusion mechanism was studied comprehen-sively,the models proposed were based on the horizontal fissure with vertical injection hole. However,in the multiplebranches horizontal directional drilling and grouting technology,the horizontal injection hole was applied to fill the fis-sure in the Ordovician limestone. Therefore,the seriflux diffusion mechanism in the fissure of aquifer proposed hereinwas based on horizontal injection hole. Firstly,the whole injection process was divided into three stages,which weredescribed by individual equations,respectively. Secondly,the change of flow front of seriflux in the vertical fissure wasanalyzed. Thirdly,the fluid dynamic model was built to describe the relationship between the injection distance and in-jection time. Fourthly,the change of flow front shape of seriflux and the choice of injection parameters were discussedby a numerical simulation method based on the Hele-Shaw model. The results obtained in the present study are usefulto design the injection holes and injection parameters. The application of the multiple branches horizontal directionaldrilling and grouting technology has showed a significant beneficial effect.