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深部巷道围岩间隔性区域断裂研究
  • 期刊名称:中国矿业大学学报,2008, 37(3),300~304
  • 时间:0
  • 分类:O319.56[理学—一般力学与力学基础;理学—力学]
  • 作者机构:[1]中国矿业大学建筑工程学院深部岩土力学与地下工程国家重点实验室,江苏徐州221008
  • 相关基金:国家自然科学基金重大项目(50490273,50774082)
  • 相关项目:深部采动覆岩移动规律及巷道稳定性控制研究
中文摘要:

深部巷道围岩间隔性区域断裂现象,与浅部围岩破裂状态有显著不同,用浅部岩体力学的弹塑性理论不能很好的解释这一现象.采用能量平衡分析方法,研究了深部巷道围岩间隔性区域断裂结构的形成机理,分析了岩石形成这一有序结构的过程,并给出了结构的序列关系.结果表明:深部巷道围岩断裂位置不出现在巷道周边,而出现在围岩内部的弹性能分布不稳定极值点处;深部巷道围岩间隔性区域断裂是深部岩体在高地应力作用下由开挖卸载引起的一种自然响应,岩石力学性质的非稳定性是巷道围岩出现这种断裂的自身原因;深部巷道围岩间隔性区域断裂序列关系跟巷道半径、围岩所处的应力状态、围岩的黏聚力和内摩擦角有关.

英文摘要:

The interm ways are distinctly di lastic-plastic theories tent zonal fracturing phenomena of surrounding rock mass in deep road erent from the failure patterns of general underground rock. Classical e o not explain this fracturing well. The producing mechanism of intermit tent zonal fracturing structure of deep underground rock mass was studied using the method of energy equilibrium analysis. The forming process of this kind of rock orderly structure and its sequence relationship were obtained. The results show that the fracturing of deep surrounding rock occurs at the unstable extreme point of elastic energy distribution in the inner part of the roadways, not in the fringe of the roadways. The intermittent zonal fracturing of surrounding rock in deep roadways is a kind of natural response caused by the unloading effect of the engineering excavation when the rock is under high tectonic stress. The instability of the mechanical properties of the rock is the intrinsic reason for this kind of fracturing. The sequence relationship of zonal fracturing orderly is related to the radius of the roadway, the stress state of the surrounding rock, the cohesion and the internal friction angle of the rock mass.

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