真三轴应力条件下层状复合岩石破坏准则

发布时间：2018-03-02 16:47

本文选题：岩石力学　切入点：真三轴应力　出处：《岩石力学与工程学报》2017年02期 　论文类型：期刊论文

【摘要】：为探究层状复合岩石的强度特性,利用均质化理论方法,将层状复合岩石虚拟为一种等效的均质岩石,建立了真三轴应力条件下基于MLC准则的层状复合岩石破坏准则,该准则由层状复合岩石各组分的强度参数以及几何参数来确定;同时,利用自行研制的多功能真三轴流固耦合试验系统,进行细砂岩、粉砂岩、板岩和层状复合岩石在三向不等应力条件(体应力不变,改变应力罗德角、等中主应力系数等σ3)下的真三轴试验,研究层状复合岩石的强度特性以及中间主应力和中主应力系数对复合岩石强度的影响。真三轴试验结果表明,所建立的准则能较好的描述层状复合岩石的强度特征,可为解决层状岩石工程结构的强度及稳定性问题提供了理论参考和依据。
[Abstract]:In order to investigate the strength characteristics of layered composite rocks, using the homogenization theory method, the layered composite rocks are hypothesized into an equivalent homogeneous rock, and the failure criteria of layered composite rocks under true triaxial stress conditions based on MLC criterion are established. The criterion is determined by the strength parameters and geometric parameters of each component of layered composite rocks, and at the same time, the fine sandstone and siltstone are carried out by using the multifunctional true triaxial fluid-solid coupling test system developed by ourselves. True triaxial tests of slate and layered composite rocks under triaxial unequal stress conditions (body stress invariant, changing stress Luo De angle, iso-middle principal stress coefficient 蟽 3), The strength characteristics of layered composite rock and the influence of intermediate principal stress and intermediate principal stress coefficient on the strength of composite rock are studied. The true triaxial test results show that the established criterion can well describe the strength characteristics of layered composite rock. It can provide theoretical reference and basis for solving the strength and stability of layered rock engineering structure.
【作者单位】：重庆大学煤矿灾害动力学与控制国家重点试验室;重庆大学资源及环境科学学院;重庆大学复杂煤气层瓦斯抽采国家地方联合工程实验室;
【基金】：国家自然科学基金资助项目(51434003,51374256) 中央高校基本科研业务费资助项目(CDJXS12241103)~~
【分类号】：TU45

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