摘要
首先从渗流-损伤耦合角度深入研究水压致裂破坏机理,探讨水压致裂过程的渗流-损伤耦合效应,提出了研究水压致裂的难点是破坏模式及失稳压力的确定.针对矿山采动岩体破坏突水问题,系统解释了渗透系数、有效应力系数在突水机理研究中的工程意义.其次,通过对煤层开采过程中底板突水实例模拟,分析了渗流-损伤耦合作用,从稳态和瞬态两个方面探讨了不同有效应力系数条件下煤矿底板突水过程的渗流-损伤耦合效应.研究结果表明:岩层破坏突水不仅和岩层的应力状态和力学强度密切相关,而且还受控于岩层的渗流力学指标;煤层底板有效应力系数越大,突水失稳临界水压越小;渗透系数越大,突水失稳临界水压越小,这对深刻理解岩体破坏突水的渗流力学本质和突水系数的内涵,具有重要的理论和实用价值.
We summarize the research status about the mechanism of hydraulic fracturing and studies the failure mechanism resultant from the seepage-damage coupling. Based on this research, we investigate the coupled seepage and damage effects during hydraulic fracturing. Aiming at water inrush induced by rock mass failure during mining, we explain the engineering meanings of permeability coefficient and the effective pressure coefficient in the mechanism of water inrush and analyze the seepage-damage coupling through the simulations about floor water inrush in coal mine. On the basis of this research, we study the coupled seepage and damage effects during floor water inrush with different effective stress coefficient from both stable and transient seepage. The results show that water inrush is not only closely related to the stress state and rock-mass strength, but also controlled by the seepage parameters. The greater the effective stress coefficient of coal seam floor is, the smaller the instability of the critical water inrush pressure becomes. The instability of the critical water inrush pressure declines when the value of permeability coefficient increases. It is of great theoretical and practical signifieance to understand the mechanism of seepage and the inherence of water-inrush coefficient during water-inrush in rock-mass failure.
出处
《采矿与安全工程学报》
EI
北大核心
2010年第3期356-362,共7页
Journal of Mining & Safety Engineering
基金
国家重点基础研究发展计划(973)项目(2007CB209400)
国家自然科学基金项目(50874024
10872046
50904013)
教育部重点科技项目(107033)
博士点基金项目(200801450003)
东北大学团队项目(NO90101001)
优秀博士基金项目(NO90601003)
关键词
水压致裂
底板突水
流-固耦合
有效应力系数
hydraulic fracturing
floor water inrush~ fluid-solid coupling
effective stress coefficient
