高围压卸荷条件下横观各向同性岩体变形破坏与能量特征研究

doi:10.13722/j.cnki.jrme.2016.1491

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摘要为揭示石英云母片岩变形及能量特征，针对平行片理和垂直片理方向的试件，基于MTS815岩石力学试验平台开展不同围压下的卸荷试验，分别从体积变形系数、能量比、能量变化率、能量应力增量比等方面系统研究高围压卸荷条件下石英云母片岩变形破坏特征及能量演化规律。结果表明：平行组试件径向变形发育能力及各特征应力量值均高于垂直组；其能量演化规律具有显著的围压效应，2组试件能量特性差异明显；与垂直组相比，平行组试件峰前、峰后应变能变化率较低且高围压下裂隙发育及塑性变形程度更高；提出能量应力增量比以表征试件能量变化对卸荷程度的敏感性，2组试件峰前能量应力增量比均随围压的增加而增加，但峰后弹性能应力增量比几乎不受初始围压的影响，垂直组峰前、峰后弹性能应力增量比和耗散能应力增量比量值均大于平行组。

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	杨以荣1
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	谢红强1
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	肖明砾1
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	刘建锋1
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	何江达1
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关键词 ：岩石力学, 石英云母片岩, 横观各向同性, 卸荷, 变形破坏, 能量演化

Abstract：The unloading tests on rock samples under different confining pressures were carried out on the system MTS815 to study the deformation and energy characteristics of quartz mica schist with horizontal and vertical foliation respectively. The volume deformation coefficient，the energy ratio，the energy change rate and the energy stress increment ratio were analyzed to investigate the mechanism of energy evolution and deformation failure characteristics of quartz mica schist under the unloading of high confining pressure. The results show that both the radial deformation capacity and the values of characteristic stresses of the sample with the horizontal foliation are higher than those with the vertical foliation. The confining pressure has the obvious influences on the energy evolution of both type of samples. The pre-peak energy stress increment ratios of both groups increase with the initial confining pressure，however the post-peak energy stress increment ratios are almost unaffected by the initial confining pressure.

Key words： rock mechanics mica-quartz schist characteristics of transverse-isotropic unloading deformation failure energy evolution

引用本文:

杨以荣1，2，谢红强1，2，肖明砾1，2，刘建锋1，2，何江达1，2. 高围压卸荷条件下横观各向同性岩体变形破坏与能量特征研究[J]. 岩石力学与工程学报, 2017, 36(8): 1999-2006.
YANG Yirong1，2，XIE Hongqiang1，2，XIAO Mingli1，2，LIU Jianfeng1，2，HE Jiangda1，2. Deformation failure and energy characteristics of transverse-isotropic rock under unloading of high confining pressure. , 2017, 36(8): 1999-2006.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2016.1491 或 http://www.rockmech.org/CN/Y2017/V36/I8/1999

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