Jiangsu Changjiang Geological Exploration Institute

为解决城郊煤矿井下水害常规注浆治理效果不佳的问题,依托地面水平定向钻进技术形成的区域超前治理技术,为治理该煤矿底板灰岩水害提供了新的技术途径。经过研究论证,该煤矿十四辅助采区地面区域治理选择太原组上段L10灰岩为治理目的层,防止底板水害。通过施工三个地面孔组(D1、D2、D3孔)共35个水平分支孔,对治理区太原组上段L10灰岩地质、水文地质及隐伏含(导)水构造等进行探查,并通过高压注浆治理将目的层改造成有效隔水层;施工的井下验证钻孔涌水量均小于10m3/h,治理效果良好;治理后计算十四辅助采区F21405工作面最大突水系数为0.044MPa/m,符合突水系数安全值不大于0.06MPa/m的标准,无突水威胁,可以安全回采。

To solve the problem of poor conventional grouting governance effect for downhole water damage in Chengjiao Coal Mine, the regional advanced governance technology formed by ground horizontal directional drilling technology provides a new technical approach for governing water damage in the floor limestone of this coal mine. After research and demonstration, the L10 limestone in the upper section of the Taiyuan Formation is selected as the purpose layer for governance in the 14th auxiliary mining area surface regional governance of this coal mine to prevent floor water damage. By constructing 35 horizontal branch holes in three ground hole groups (D1, D2, D3 hole), the geological, hydrogeological, and hidden water bearing (conductive) structures of the L10 limestone in the upper section of the Taiyuan Formation in the governance area are explored, and the purpose layer is transformed into an effective waterproof layer through high-pressure grouting governance; The downhole verification drilling water inflow of construction is less than 10 m3/h, and the governance effect is good; After governance, the maximum water inrush coefficient of the F21405 working face in the 14th auxiliary mining area is calculated to be 0.044 MPa/m, which meets the standard of a safety value of no more than 0.06 MPa/m for water inrush coefficient. There is no threat of water inrush and it can be safely mined.