考虑黏聚力损失的岩石残余强度模型与数值验证Cohesive force loss-considered rock residual strength model and its numerical verification
李响,荣冠,彭俊,侯迪
摘要(Abstract)：
岩石的峰后力学性质对于维持岩土工程结构的稳定性至关重要,为研究岩石峰后残余强度的确定方法,利用岩石进入残余强度阶段后摩擦力强度增强、黏聚力强度减小的特点,通过假定岩石进入残余变形阶段后黏聚力强度为0,基于HOEK-BROWN破坏准则,建立了一种考虑岩石进入残余强度阶段时黏聚力损失的岩石残余强度模型。用该模型拟合完整粗晶大理岩的室内三轴试验结果,并与已有M-C模型和Joseph模型等方法对比分析,讨论了模型的优势。将该模型嵌入到FLAC3D软件中进行数值模拟验证,结果表明:该岩石残余强度模型能正确反映不同围压条件下岩石力学响应的基本规律,得到的残余强度值与试验结果吻合良好,其随围压变化的拟合曲线符合试验数据拟合结果的特点,即经过原点及高围压条件下未出现应变硬化现象。研究成果对分析岩石残余强度的确定方法具有较强的参考价值或指导意义。
关键词(KeyWords)： 岩石力学;HOEK-BROWN破坏准则;岩石残余强度;黏聚力强度;粗晶大理岩
基金项目(Foundation): 国家自然科学基金项目(51579189,51609178,41772305);; 武汉大学自主科研项目(2042016k0042,2042016kf0171)
作者(Author): 李响,荣冠,彭俊,侯迪
DOI: 10.13928/j.cnki.wrahe.2018.11.024
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