倾斜煤层回采巷道围岩变形机理和控制技术研究  

Research on the deformation mechanism and control technology of surrounding rock in inclined coal seam mining roadway

作　　者：赵永刚 ZHAO Yonggang(Sinopec Great Wall Energy and Chemical(Ningxia)Co.,Ltd.,Yinchuan,Ningxia 750411,China)

机构地区：[1]中国石化长城能源化工(宁夏)有限公司,宁夏回族自治区银川市750411

出　　处：《中国煤炭》2025年第4期64-75,共12页China Coal

摘　　要：针对倾斜煤层回采巷道变形和破坏问题,以银星二号煤矿1131005工作面回采巷道工程地质条件为背景,基于现场煤岩体地质力学试验揭示了巷道围岩地应力场分布规律,得出巷道与最大主应力夹角大、裂隙发育突出以及围岩强度分布差异性大是造成巷道出现变形破坏的主要内因。建立了倾斜煤层力学模型,模拟结果表明倾斜煤层倾角越大、底板厚度越小、破断岩块长度越小,形成的煤层底板破碎岩体平衡结构也就越不稳定,越不利于倾斜煤层巷道围岩稳定。基于银星二号煤矿倾斜煤层巷道机理分析,提出了支护改性卸压协同控制技术,制定了顶底板注浆锚索加固方案、巷帮注浆改性以及顶板卸压技术方案,并开展了井下试验。结果表明,试验段内巷道顶底板最大移近量63.6 mm,两帮最大移近量50.8 mm,试验巷道围岩变形明显减少,完整性显著提高,表明支护改性卸压协同控制技术有效控制了倾斜煤层巷道围岩变形。In response to the significant deformation and damage problems in inclined coal seam mining roadway,based on the engineering geological conditions of the mining roadway in Yinxing No.21131005 working face,the distribution law of the surrounding rock stress field of the roadway was revealed through on-site coal rock geomechanical experiments.It was found that the large angle between the roadway and the maximum principal stress,prominent crack development,and large differences in the distribution of surrounding rock strength were the main internal factors causing deformation and damage in the roadway.A mechanical model for inclined coal seams has been established,indicating that the larger the inclination angle of the coal seam,the smaller the thickness of the floor,and the shorter the length of the fractured rock block,the more unstable the equilibrium structure of the fractured rock mass formed by the coal seam floor,and the less conducive it is to the stability of the surrounding rock of the inclined coal seam roadway.In response to the analysis of the mechanism of inclined coal seam roadway in Yinxing No.2 Coal Mine,a support modification pressure relief collaborative control technology was proposed.A roof and floor grouting anchor reinforcement scheme,roadway side grouting modification,and roof pressure relief technology scheme were formulated,and underground experiments were carried out.The results showed that the maximum displacement of the roof and floor of the roadway in the experimental section was 63.6 mm,and the maximum displacement of the two sides was 50.8 mm.The deformation of the surrounding rock of the experimental roadway was significantly reduced,and the integrity was significantly improved,indicating that the support modification pressure relief collaborative control technology effectively controlled the deformation of the surrounding rock of the inclined coal seam roadway.

关 键 词：倾斜煤层 围岩控制 支护改性卸压协同控制技术 注浆改性 水力压裂卸压 

分 类 号：TD322[矿业工程—矿井建设]