节理面强度弱化与强化行为的模拟

doi:10.13722/j.cnki.jrme.2018.0704

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摘要在岩石节理剪切试验过程中，依据节理面法向方向的约束形式可划分为常法向载荷作用、常法向刚度约束和常法向位移约束。常法向刚度约束下的剪应力–位移曲线呈现复杂的剪切行为。针对常法向刚度约束，基于将应变软化过程转化为一系列应力跌落与塑性流动过程的方法，将其拓展至可以同时模拟强度软化和强度硬化行为，给出了相应的求解表示式。就节理面在不同法向刚度约束条件下的剪切过程进行了模拟分析。在法向刚度较小时，节理剪切过程呈现强度软化行为；随着法向刚度增加，节理剪切过程转变为强度硬化。剪应力–切向位移、法向位移–切向位移和法向应力–切向位移等曲线的模拟结果与已有的试验结果基本一致，说明提出的方法是可靠的。进一步对不同的初始法向应力与法向刚度组合形成的约束进行了模拟，分析了相应的节理面剪切行为。

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	王水林1
	郭明伟1
	孙冠华1
	柯长仁2
	李泽栋2

关键词 ：岩石力学, 岩石节理面, 常法向刚度, 强度软化, 强度硬化

Abstract：In shear tests of rock joints，constant normal load(CNL)，constant normal displacement and constant normal stiffness(CNS) conditions are used. Compared to the first two conditions，Shear stress-displacement curves display more complicated in the case of CNS condition. Aiming to evaluate shear behavior of rock joints under CNS，an extension was made to model strength softening and strength hardening processes in a unified form on the basis of the approach which takes strain softening process as a series of stress drop and plastic flow，and the corresponding formulation was presented. Shear behavior was modeled under various CNS conditions. The results show that shear stress-displacement curve displays in strength softening mode when the normal stiffness is small but that strength hardening mode appears while the normal stiffness increases. The shear stress-shear displacement curves，normal displacement-shear displacement curves and normal stress-shear displacement curves were compared with test results and good agreements between them were observed，which indicates that the presented procedure is reliable. Furthermore，the shear behavior of rock joints was studied under different combinations of the initial normal stress and the normal stiffness.

Key words： rock mechanics rock joints constant normal stiffness(CNS) strength softening strength hardening

引用本文:

王水林1，郭明伟1，孙冠华1，柯长仁2，李泽栋2. 节理面强度弱化与强化行为的模拟[J]. 岩石力学与工程学报, 2018, 37(12): 2742-2750.
WANG Shuilin1，GUO Mingwei1，SUN Guanhua1，KE Changren2，LI Zedong2. Modeling of softening and hardening behaviors of the#br# shear strength of rock joints. , 2018, 37(12): 2742-2750.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0704 或 http://www.rockmech.org/CN/Y2018/V37/I12/2742

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