峰后裂隙岩石非线性损伤特性与数值模拟研究

发布时间：2018-04-21 09:15

本文选题：非线性损伤 + 应变能密度理论　；参考：《岩土力学》2017年07期

【摘要】：在地下洞室、隧道等工程中,裂隙岩石峰值强度后的损伤破坏特性及演化机制对控制围岩稳定至关重要,目前,对岩石峰后的损伤破坏特性研究不充分,认识不全面,易出现大体积塌方、大变形等工程事故。针对峰后裂隙岩石的力学性质,开展室内三轴试验,分析其非线性损伤破坏特性;假设岩石损伤满足Weibull分布规律,引入损伤变量,推导出峰后裂隙岩石非线性损伤破裂本构方程;将上述本构方程与能量耗散原理、应变能密度理论相结合,建立了峰后裂隙岩石的非线性损伤破坏准则;采用FISH语言开发了基于上述破坏准则的峰后岩石损伤破裂计算程序,用连续的方法模拟分析了峰后裂隙岩石的非连续损伤破裂过程,揭示了裂隙岩石峰后损伤破坏特性及其演化规律,并与裂隙岩石的三轴压缩试验结果进行了对比。结果表明:上述本构方程与判别准则能较好地模拟峰后裂隙岩石非线性损伤破裂过程。为有效控制围岩稳定提供一种新的理论分析手段。
[Abstract]:In underground cavern, tunnel and so on, the damage and failure characteristics and evolution mechanism of fractured rock after peak strength are very important to control the stability of surrounding rock. At present, the research on the damage and failure characteristics of rock after peak is not enough and the understanding is not comprehensive. Prone to large volume collapse, large deformation and other engineering accidents. According to the mechanical properties of post-peak fractured rock, the laboratory triaxial test is carried out to analyze its nonlinear damage and failure characteristics, assuming that the rock damage satisfies the Weibull distribution rule, and the damage variable is introduced. The nonlinear damage fracture constitutive equation of post-peak fractured rock is derived, and the nonlinear damage failure criterion of post-peak crack rock is established by combining the above constitutive equation with the energy dissipation principle and the strain energy density theory. Based on the above failure criterion, a program for calculating the damage and fracture of post-peak rock is developed by using FISH language, and the discontinuous damage and fracture process of post-peak fractured rock is simulated and analyzed by continuous method. The characteristics and evolution of post-peak damage and failure of fractured rock are revealed and compared with the results of triaxial compression test of fractured rock. The results show that the above constitutive equations and discriminant criteria can well simulate the nonlinear damage and fracture process of post-peak fractured rock. It provides a new theoretical analysis method for effectively controlling the stability of surrounding rock.
【作者单位】：山东大学岩土与结构工程研究中心;中国建筑股份有限公司技术中心;
【基金】：国家自然科学基金面上项目(No.51379113,No.51134001) 教育部高等学校博士学科点博导类专项科研基金(No.20120131110031) 山东省杰出青年基金(No.201313JQE27042) 山东省自然科学基金资助(No.ZR2013EEQ023)~~
【分类号】：TU45

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