煤矿安全2025，Vol.56Issue(3)：188-196,9.DOI:10.13347/j.cnki.mkaq.20241559
煤层顶板含水层疏放水井孔工程优化解析模型推导及应用
Derivation and application of analytical model for engineering optimization of drainage well hole in coal seam roof aquifer
摘要
Abstract
It is an effective means to eliminate the threat of roof water damage to carry out water exploration and drainage project be-fore coal seam mining.Selecting the typical working face of Yan'an Formation 2#coal seam as the research object,which is widely distributed in Yuanyanghu Mining Area of Ningdong Coal Field,based on the"point-source&line-sink"theory of groundwater dy-namics,through the generalization of roof water drainage problem and theoretical model derivation,the analytical formula for calcu-lating stable well flow of single inclined borehole water drainage in sandstone aquifer of coal seam roof is established.Based on the principle of"mapping well"for groundwater,analytical model of well flow for calculating the depth reduction at any point during the drainage process of bounded aquifers at the top and bottom has been derived,then,based on the principle of underground water radiation well flow,a method for optimizing the number of branch boreholes in the"radiation well"for drainage water has been proposed.By integrating the principle of"interference well"well flow superposition calculation and the formula for calculating the stable flow of incomplete wells in a finite thickness aquifer,an analytical formula for calculating the depth reduction at any point in space under the influence of the water release effect of the"well group"superposition is further derived.By constructing an optim-ization calculation analytical model for the spacing between drilling sites and conducting trial calculations for the spacing between drilling sites under different mining width conditions,the mathematical relationship between the spacing between drainage drilling sites and the mining width of the working face in the study area is determined.A comprehensive optimization method for drainage well hole engineering is proposed,which is applied to a typical case working face in Yuanyanghu Mining Area of Ningdong Coal Field.The drainage section of the working face roof,the spacing between drainage drilling sites,and the construction parameters of drainage drilling holes are optimized and determined.The application results show that the quantity and timeliness of water dis-charge are optimized to a greater extent than the traditional pre-mining roof water discharge mode through the comprehensive effect test of water control in working face mining.关键词
顶板水害/砂岩含水层/钻孔疏放水/井流计算/解析模型Key words
water hazard of roof aquifer/sandstone aquifer/drilling and draining/water well flow calculation/analytical model分类
矿山工程引用本文复制引用
周振方..煤层顶板含水层疏放水井孔工程优化解析模型推导及应用[J].煤矿安全,2025,56(3):188-196,9.基金项目
天地科技股份有限公司科技创新创业资金专项重点资助项目(2022-2-TD-ZD005) （2022-2-TD-ZD005）
陕西省青年科技新星资助项目(人才)(2023KJXX-094) （人才）
陕西省自然科学基础研究计划重点资助项目(2023-JC-ZD-27) （2023-JC-ZD-27）
国家自然科学基金资助项目(42472331) （42472331）
