Abstract

The stability of surrounding rock is greatly affected by the mechanical properties of structural planes. At present, numerical methods have become an effective approach to scientifically evaluate the bearing capacity and predict the failure mode of jointed rock masses. Based on the basic theory of peridynamics, a strength reduction model is proposed to characterize the deformation and failure mechanisms of jointed rock masses. This model divides the bonds between material points into rock bonds and joint bonds and uses the strength reduction coefficient to establish the relationship between the two types of bonds. Therefore, the mechanical behaviour of rocks and joints can be described under a unified computational framework. Through the uniaxial compression simulation of intact rock, jointed rock mass with a single joint and jointed rock mass with multiple parallel joints and the comparison of the results with laboratory test results, the correctness and applicability of the model proposed in this paper are proven. The results show that during uniaxial compression, the damage first appears at the joints and then extends to the whole specimen, forming a penetrating fracture. The failure modes of jointed rock masses with different joint inclination angles are very different and correspond to three typical modes: sliding failure, splitting failure and mixing failure. Whether a rock mass with a single joint or a rock mass with multiple parallel joints is used, the peak load under uniaxial compression shows a typical V-shape with the increase in joint inclination angle. Although the failure modes of jointed rock masses with different joint inclination angles are similar under different strength reduction coefficients, their peak loads vary significantly. It is obvious that the peak load of jointed rock masses with different joint inclination angles decreases with the decrease in the strength reduction coefficient, especially in the uniaxial compression simulations of rock masses with multiple parallel joints. The research methods and results of this paper provide an important reference for future surrounding rock stability analysis in underground engineering and slope engineering.

Article Highlights

1. 1.

   A strength reduction model was proposed to characterize the deformation and failure mechanisms of jointed rock masses.

2. 2.

   The complete failure processes of intact rock, rock mass with a single joint and rock mass with multiple parallel joints under uniaxial compression were studied.

3. 3.

   The influences of different joint inclination angles and strength reduction coefficients on the failure mode of the jointed rock masses were analysed.

中文翻译：

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节理岩体强度折减模型及单轴压缩试验的围岩动力学模拟

摘要

围岩的稳定性在很大程度上受结构面的机械性能影响。目前，数值方法已经成为科学评估承载力和预测节理岩体破坏模式的有效方法。基于围岩动力学的基本理论，提出了一种强度折减模型来表征节理岩体的变形和破坏机理。该模型将材料点之间的结合分为岩石结合点和节理结合点，并使用强度折减系数建立两种结合点之间的关系。因此，岩石和节理的力学行为可以在统一的计算框架下描述。通过完整岩石的单轴压缩模拟，单节理节理岩体和多节理节理岩体以及与实验室测试结果的比较，证明了该模型的正确性和适用性。结果表明，在单轴压缩过程中，损伤首先出现在接头处，然后扩展到整个试样，形成穿透性断裂。节理倾角不同的节理岩体的破坏模式有很大不同，分别对应于三种典型的模式：滑动破坏，劈裂破坏和混合破坏。无论使用单个节理的岩体还是多个平行节理的岩体，单轴压缩下的峰值载荷都会随着节理倾角的增加而呈现出典型的V形。尽管在不同的强度折减系数下，具有不同节理倾角的节理岩体的破坏模式是相似的，但其峰值载荷却有很大的变化。显然，不同节理倾角的节理岩体的峰值载荷随着强度折减系数的减小而减小，特别是在具有多个平行节理的岩体的单轴压缩模拟中。本文的研究方法和结果为今后地下工程和边坡工程围岩稳定性分析提供了重要的参考。显然，不同节理倾角的节理岩体的峰值载荷随着强度折减系数的减小而减小，特别是在具有多个平行节理的岩体的单轴压缩模拟中。本文的研究方法和结果为今后地下工程和边坡工程围岩稳定性分析提供了重要的参考。显然，不同节理倾角的节理岩体的峰值载荷随着强度折减系数的减小而减小，特别是在具有多个平行节理的岩体的单轴压缩模拟中。本文的研究方法和结果为今后地下工程和边坡工程围岩稳定性分析提供了重要的参考。

文章重点

1. 1。

   提出了强度折减模型来表征节理岩体的变形和破坏机理。

2. 2。

   研究了完整岩石，单节理岩体和多节理岩体在单轴压缩下的完整破坏过程。

3. 3。

   分析了不同节理倾角和强度折减系数对节理岩体破坏模式的影响。