非贯通节理岩体损伤变量计算方法研究

发布时间：2018-02-25 18:48

  本文关键词： 单组非贯通节理岩体 损伤变量 应力强度因子 单轴压缩 弹性余能等效假设　出处：《岩土力学》2016年S1期 　论文类型：期刊论文

【摘要】：作为岩体组成部分的非贯通节理对岩体力学特性有着重要影响,然而几乎目前所有的岩体损伤变量计算方法都仅考虑节理几何参数对岩体力学特性的影响。对含单组非贯通节理的岩体力学特性进行研究,提出一个能够同时考虑节理几何及强度参数对岩体力学特性影响的新的岩体损伤变量计算方法。首先,采用弹性余能等效假设代替Lemaitre应变等效假设研究由节理引起的岩体各向异性损伤,并基于断裂力学中单个节理引起的附加应变能增量与损伤力学应变能释放量相关联的观点,推导出由单条节理引起的损伤变量计算公式。其次,根据断裂力学理论获得了单轴压缩下单条节理尖端应力强度因子(SIF)K_Ⅰ、K_Ⅱ的计算公式。最后,通过考虑节理间的相互作用给出了单组单排或多排节理尖端应力强度因子K_Ⅰ、K_Ⅱ的计算公式,得到了单组节理引起的岩体损伤变量计算公式,并与已有试验结果的对比分析证明了该公式的合理性。
[Abstract]:As a part of rock mass, non-through joints have an important influence on the mechanical properties of rock mass. However, almost all the methods for calculating damage variables of rock mass only consider the effect of geometric parameters of joints on the mechanical properties of rock mass. A new method for calculating damage variables of rock mass considering the effects of joint geometry and strength parameters on the mechanical properties of rock mass is proposed. The anisotropic damage of rock mass caused by joints is studied by using elastic complementary energy equivalent hypothesis instead of Lemaitre strain equivalent hypothesis, and based on the viewpoint that the increment of additional strain energy caused by a single joint in fracture mechanics is related to the release of strain energy of damage mechanics. The formula for calculating damage variables caused by single joint is derived. Secondly, according to the theory of fracture mechanics, the formula for calculating the stress intensity factor (SIFK _ I / K _ 鈪，

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