上行卸压开采顶板裂隙带巷道失稳过程物理模拟

发布时间：2018-04-25 03:08

本文选题：上行开采 + 卸压开采　；参考：《中国安全科学学报》2017年06期

【摘要】：为解决上行卸压开采顶板裂隙带巷道大变形问题,采用物理模拟方法,研究上覆岩层活动特征及裂隙发育破坏过程,分析锚杆支护条件下巷道围岩应力变化过程及变形破坏特征。结果表明:顶板裂隙带巷道随着上覆岩层有整体下沉特征;上行开采采动影响阶段,在采动应力与巷道掘进围岩应力叠加形成的应力场和采动裂隙场共同作用下,顶板裂隙带巷道围岩强度大幅降低,巷道断面收敛变形强烈,采动影响稳定阶段围岩应力低,用锚架联合支护或注浆加固围岩技术手段能维护巷道断面,保证其安全使用。
[Abstract]:In order to solve the problem of large deformation of roadway in roof fissure zone in upward pressure relief mining, the active characteristics of overlying strata and the process of fracture development and failure are studied by physical simulation method. The stress variation process and deformation failure characteristics of roadway surrounding rock under bolt support are analyzed. The results show that the roof fissure zone roadway has the integral subsidence characteristics with the overlying strata, and in the stage of the mining effect of upward mining, under the joint action of the stress field and the mining fissure field formed by the superposition of the mining stress and the surrounding rock stress of the roadway excavation, The strength of surrounding rock of roadway in roof fissure zone is greatly reduced, the convergent deformation of roadway section is strong, and the stress of surrounding rock is low at the stage of stability affected by mining. The technical means of bolt-frame combined support or grouting to reinforce surrounding rock can maintain the section of roadway and ensure its safe use.
【作者单位】：河南理工大学能源科学与工程学院;煤炭安全生产河南省协同创新中心;
【基金】：国家自然科学基金资助(51304065) 河南理工大学青年骨干资助项目
【分类号】：TD322;TD353

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