基于界面黏结–滑移模型的等间距破裂层状岩体裂隙间距分析

doi:10.13722/j.cnki.jrme.2021.0720

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摘要等间距破裂是层状岩体中常见的一种地质现象，如何合理预测裂隙间距，对岩体的稳定性分析具有重要的理论及工程意义。考虑层状岩体界面剪应力在滑移过程中的应力软化现象，基于界面的三线式黏结–滑移本构关系，推导岩层界面处于不同黏结状态下破裂岩层内拉应力和的岩层界面剪应力解析表达式；建立考虑覆岩压力的岩体拉伸破坏准则并给出等间距破裂岩体的裂隙间距计算公式；通过有限元数值计算和现场实测数据验证所提出理论计算公式的可行性；并进一步分析影响层状岩体中裂隙间距的主要因素。结果表明建立的黏结–软化–滑移解析模型可用于分析岩体界面处于黏结、部分滑移、应力软化及完全滑移等不同状态下的裂隙间距计算。

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	常旭1
	白克彬2
	张旭3
	俞缙1
	王树仁3

关键词 ：岩石力学, 层状岩体, 裂隙间距, 黏结&ndash, 滑移模型, 解析解

Abstract：Equally-spaced fractures can be commonly found in layered rocks. How to predict the fracture spacing has important significance and practical value for the stability analysis of layered rocks. Considering softening behavior of the shear stress along the rock interface，a tri-linear bond slip model was adopted to calculate the full-range evolution of the shear stress along the rock interface and the tensile stress in fractured layered rocks. A failure criterion for the layered rock considering the influence of the overload was developed and then the analytical expressions for predicting the fracture spacing in fractured layered rocks under different bond conditions were proposed. The feasibility of the proposed calculation formula was verified by finite element simulation and field data. The evolution of the fracture spacing and the influencing factors were analyzed. The results indicate that the proposed analytical solutions can be used to predict the fracture spacing for the rock interface under different conditions，such as bond，part bond，shear stress softening and complete slip.

Key words： rock mechanics')" href="#">

rock mechanics layered rocks fracture spacing bond-slip model analytical solution

引用本文:

常旭1，白克彬2，张旭3，俞缙1，王树仁3 . 基于界面黏结–滑移模型的等间距破裂层状岩体裂隙间距分析[J]. 岩石力学与工程学报, 2022, 41(4): 725-733.
CHANG Xu1，BAI Kebin2，ZHANG Xu3，YU Jin1，WANG Shuren3. Fracture spacing analysis of equally-spaced fractures in layered rocks based on a bond-slip model for rock interface#br#. , 2022, 41(4): 725-733.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0720 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I4/725

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