三轴压缩条件下千枚岩破裂与能量特征研究

发布时间：2018-03-14 15:32

  本文选题：千枚岩　切入点：三轴压缩　出处：《工程地质学报》2017年02期 　论文类型：期刊论文

【摘要】：利用MTS815程控伺服岩石力学试验系统,对千枚岩进行不同围压下的三轴压缩试验,研究围压对千枚岩变形破坏特征和能量演化特征的影响。结果表明:在低围压下,千枚岩破坏模式为张-剪复合型破坏,随着围压升高,破坏模式转变为剪切破坏;弹性应变能曲线和耗散能曲线的交点k为能量分界点,k之前表现为能量积聚,k之后表现为能量释放;总能量与轴向应变关系曲线在加载初期呈下凹曲线,能量增速升高,加载后期呈上凸曲线,能量增速降低;特征应力点的总能量和储能的弹性应变能均随围压的增大而增大;围压对岩石内部裂纹扩展和峰后能量释放均有阻碍作用。
[Abstract]:The triaxial compression tests of phyllite under different confining pressures were carried out by using MTS815 program controlled servo rock mechanics test system. The effects of confining pressure on the deformation, failure and energy evolution characteristics of phyllite were studied. The results show that: under low confining pressure, The failure mode of phyllite is tension-shear composite failure, and with the increase of confining pressure, the failure mode changes to shear failure. The intersecting point k of elastic strain energy curve and dissipation energy curve shows energy accumulation and energy release before energy separation point k, the curve of total energy and axial strain relation shows concave curve at the beginning of loading, and the energy growth rate increases. At the later stage of loading, the curve is convex, the energy growth rate decreases, the total energy of characteristic stress point and the elastic strain energy of energy storage increase with the increase of confining pressure, and the confining pressure hinders the crack propagation and energy release after peak.
【作者单位】： 地质灾害防治与地质环境保护国家重点实验室(成都理工大学);
【基金】：国家自然科学基金项目(41230635) 地质灾害防治与地质环境保护国家重点实验室课题(SKLGP2013Z004) 四川省教育厅项目(16ZA0095)资助
【分类号】：TU45
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本文编号：1611822