摘要
侏罗系富水煤层具有富水性强、涌水量变化显著等特点,传统针对煤矿顶、底板涌水机理的研究难以适用于此类煤层,严重制约了矿井的安全高效生产。以鄂尔多斯煤田小纪汗煤矿为研究对象,设计了富水煤层相似材料配比,提出了富水煤层物理相似模拟方法及系统,构建了富水煤层开采的物理相似试验模型,揭示了开采过程中覆岩应力及涌水变化特征,并结合数值模拟分析了采动裂隙演化及涌水规律。结果表明:所研发的富水煤层相似模拟材料具备耐水、抗崩解、抗软化特性,其强度和渗透系数适用于榆横矿区富水煤层的物理模拟;采用预制块模拟富水煤层,可实现煤层开挖模拟并实时监测涌水量变化;物理模拟与数值模拟均表明,随着涌水点与工作面距离减小,顶板应力呈现“增长-降低-稳定”的特征,涌水量则先缓慢减小,在距离工作面10~20 m时出现突增波动现象。研究结果为我国侏罗系富水煤层高强度安全开采提供了科学依据。
Jurassic water-rich coal seams are characterized by strong water abundance and significant water inflow variability.Previous researches on the mechanisms of water inflow in the roof and floor of coal mines are inapplicable to such seams,which severely restricts the safe and efficient production of coal mines.This study focuses on Xiaojihan Coal Mine in the Ordos Coalfield as a case study.Specifical-ly,the material ratios for simulating water-rich coal seams were designed,and a physical similarity sim-ulation method and system for such seams were proposed.In addition,a physical similarity test model for water-rich coal seam mining was constructed for the purpose of revealing the characteristics of over-burden stress and water inflow changes during mining.Finally,numerical simulations were employed to analyze the mining-induced fracture evolution and water inflow pattern.The following conclusions were drawn:The developed simulation materials present water resistance,anti-disintegration,and anti-softening properties,and their strength and permeability coefficient are suitable for physical simulation of water-rich coal seams in the Yuheng Mining Area.Using prefabricated blocks of similar materials to simulate water-rich coal seams enables the simulation of coal seam excavation and the real-time monitoring of water inflow changes.Both physical and numerical simulations indicate that as the distance between water inflow points and the working face decreases,roof stress displays a three-phase variation characteristic of"increase-decrease-stabilization",while the water inflow first declines slowly and then soars with fluctuations at a distance of 10-20 m from the working face.The research findings provide important scientific support for the high-intensity and safe mining of Jurassic water-rich coal seams in China.
作者
肖猛
巨峰
何泽全
王栋
XIAO Meng;JU Feng;HE Zequan;WANG Dong(State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;School of Mechanics and Optoelectronic Physics,Anhui University of Science&Technology,Huainan,Anhui 232001,China)
出处
《采矿与安全工程学报》
北大核心
2025年第4期890-903,共14页
Journal of Mining & Safety Engineering
基金
新疆维吾尔自治区重大科技专项项目(2023A01002)
新疆维吾尔自治区中央引导地方科技发展专项项目(ZYYD2024JD16)。
关键词
侏罗系煤层
富水煤层
物理相似模拟
流固耦合
动态演化
Jurassic coal seams
water-rich coal seams
physical similarity simulation
fluid-solid cou-pling
dynamic evolution
作者简介
肖猛(1993-),男,山东省泰安市人,博士,助理研究员,从事煤基固废资源化利用和煤矿安全开采方面的研究。E-mail:m.xiao@cumt.edu.cn,Tel:18252435656。
