Damage coupled time-dependent model of a jointed rock mass and application to large underground cavern excavation
Damage coupled time-dependent model of a jointed rock mass and application to large underground cavern excavation
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DOI：
10.1016/j.ijrmms.2003.01.003
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发表时间：
2004-06
影响因子：
7.2
通讯作者：
Wei zhong Chen;W. Zhu;J. Shao
中科院分区：
文献类型：
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作者：
Wei zhong Chen;W. Zhu;J. Shao
多晶岩和混凝土等非均质材料中含有大量的孔隙和微裂缝。这些微缺陷负责非弹性力学行为，最终导致压缩和剪切作用下的宏观破坏。对玻璃、硬塑料、石膏、冰、混凝土和岩石等脆性材料的破坏机制进行了大量的研究[1-19]。所建立的本构模型的主要优点是可以描述岩石在压缩和剪切应力作用下微裂纹的成核和扩展的物理机制。在岩石工程稳定性分析中，最重要的因素是模拟岩体的宏观破坏和开挖损伤区。岩体的变形不仅受岩石基质性质的支配，还受不连续面/裂隙的取向和蠕变性质的支配。Kranz等[[20]]研究了温度和水分对花岗岩在一定载荷下蠕变断裂扩展的影响，得出温度和含水量增加会导致岩石变弱和破坏的结论。Fakhimi和Fairhurst等人开发了一个考虑岩石裂缝影响的完整岩石时间依赖模型。
Heterogeneous materials such as polycrystalline rocks and concrete contain a large number of pores and microcracks. These microdefects are responsible for inelastic mechanical behaviour and finally lead to macroscopic failure under compression and shear. Numerous studies have been undertaken to explain the failure mechanism of brittle materials including glass, hard plastics, plaster, ice, concrete and rock [1–19]. The main advantages of the developed constitutive models are that they can describe the physical mechanisms in rock resulting from nucleation and propagation of microcracks under compressive and shear stresses. For stability analysis in rock engineering, the most important factor is to simulate macroscopic failure and the damage zone in a rock mass due to excavation. The deformation of a rock mass is governed not only by the properties of the rock matrix, but is also governed by the orientation and creep properties of the discontinuities/fractures. Kranz et al.[20] investigated the temperature and water effects on the creep fracture growth of granite at a given load, and concluded that increasing temperature and water content led to weakening of the rock and to failure. Fakhimi and Fairhurst [21] developed a time-dependent model of intact rock considering also the effect of rock fractures.