考虑基体变形和微凸体变形相互作用的岩石节理闭合变形理论模型

发布时间：2018-04-01 17:33

  本文选题：岩石节理　切入点：闭合变形　出处：《岩土工程学报》2017年10期

【摘要】：地下岩体工程建设和运营过程中,需要考虑节理岩体的水力学性质,这与节理的闭合变形密切相关。对法向应力作用下节理微凸体的变形特征进行详细分析,逐个计算接触微凸体的法向变形和接触应力;采用接触理论计算微凸体基圆半径之外的基体变形,并以此调整微凸体的法向位置,进而提出新的闭合变形理论模型。新模型可反映节理的基体变形和微凸体变形相互作用的影响,也能体现形貌分量和接触类型对闭合变形的影响。与已有的理论模型比较,新模型的计算值更为接近试验值。采用叠加原理,新模型计算得到的初始法向刚度最小;但随法向应力的增加,法向刚度增加速率逐步加快。
[Abstract]:In the process of construction and operation of underground rock mass, the hydraulic properties of jointed rock mass should be considered, which is closely related to the closed deformation of joint.The deformation characteristics of joint and microconvex under normal stress are analyzed in detail. The normal deformation and contact stress of contact microconvex are calculated one by one, and the matrix deformation beyond the radius of base circle of microconvex is calculated by contact theory.The normal position of the microconvex body is adjusted and a new closed deformation theory model is proposed.The new model can reflect the influence of matrix deformation and micro-convex deformation interaction of joints, and the effect of morphology and contact type on closed deformation.Compared with the existing theoretical model, the calculated value of the new model is closer to the experimental value.By using the superposition principle, the initial normal stiffness obtained by the new model is the smallest, but with the increase of normal stress, the increasing rate of normal stiffness increases gradually.
【作者单位】： 中国地质大学(武汉)工程学院;成都理工大学地质灾害防治与地质环境保护国家重点实验室;中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;
【基金】：国家自然科学基金面上项目(41672302,11672360,41402247) 地质灾害防治与地质环境保护国家重点实验室开放基金项目(SKLGP2014K018)
【分类号】：TU45
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本文编号：1696611