为了进一步提高极复杂地质构造下矿井底板岩溶水害区域治理技术的有效性,降低底板突水的危险性,解决矿井区域水害治理过程中面临的太原组上段灰岩含水层岩溶裂隙发育、水压高、富水性强、井下钻孔工程量大、施工工期长等安全技术难题,通过分析矿井近年来区域治理后工作面底板出水案例及特征,提出了地面定向钻孔超前区域治理底板岩溶水害技术。以陈四楼煤矿南翼九采区2901、2903试验工作面开采为背景,选取了L8灰岩含水层作为目标层位,设计了地面定向孔组的技术参数,并通过现场试验测试分析了治理前后的二2煤底板水压和各钻孔的吸水率。结果表明:注浆后各钻孔的吸水率呈现明显的下降趋势,Z2和Z3孔组钻孔平均吸水率分别下降97%和94%,经过定向钻孔超前注浆加固底板太原组上段灰岩后,岩溶裂隙得到了有效充填;治理后区内太原组上段L8灰岩内水压下降至1.2~4.2MPa,且水压分布不再与地层埋深吻合,多呈孤岛状,太原组上段L8灰被改造为等效隔水层,底板突水系数下降至0.023~0.057MPa/m。技术成功应用实现了极复杂地质构造下强突水危险性工作面的安全高效回采,为同类矿井相似型综采面的底板岩溶水害防治,探索出了一套新的方法。

In order to further improve the effectiveness of regional treatment technology for karst waterdamage in mine floor under extremely complex geological structure, reduce the risk of water inrush fromfloor, and solve the safety technical problems such as karst fissure development, high water pressure,strong water richness, large amount of underground drilling engineering and long construction period inthe upper limestone aquifer of Taiyuan Formation in the process of regional water damage treatment inmine, the technology of advanced regional treatment of karst water damage in floor by surface directional drilling is put forward through the analysis of the cases and characteristics of water inrush from working face floor after regional treatment in recent years. Based on the mining of 2901 and 2903 test working faces in No. 9 mining area of the south wing of the Chensilou coal mine, the L8 limestone aquiferwas selected as the target horizon, and the technical parameters of the ground directional hole groupwere designed. Through the field test, the water pressure of the coal floor and the water absorption rateof each borehole before and after the treatment were analyzed. The results show that the water absorption rate of each borehole decreases obviously after grouting, and the average water absorption rate ofboreholes in Z2 and Z3 borehole groups decreases by 97% and 94% respectively; karst fissures are effectively filled after the limestone in the upper section of Taiyuan Formation is reinforced by directionaldrilling and advanced grouting. After treatment, the water pressure in the L8 limestone of the upperTaiyuan Formation in the area decreases to 1. 2 ~ 4. 2 MPa, and the water pressure distribution is nolonger consistent with the buried depth of the stratum, mostly in an isolated island shape; the L8 limestone of the upper Taiyuan Formation is transformed into an equivalent aquifuge, and the floor water inrush coefficient decreases to 0. 023 ~ 0. 057 MPa / m. The successful application of the technology hasrealized a safe and efficient mining of working face with strong water inrush risk in extremely complexgeological structure, and explored a new set of water disaster prevention and control technology for floorkarst water disaster in similar fully mechanized mining face of similar mines.