多裂隙岩体受压后的破裂过程及工程应用
首发时间:2012-06-18
摘要:在节理岩体中开挖工程时,因原有应力状态的变化,其中原生裂隙会发生扩展,并重生成新裂隙,从而劣化了其力学和强度特性,本文采用DDARF的方法,在岩石块体中预设不同数量及不同间距的裂隙,然后通过数值模拟实验的方法研究这些裂隙的起裂、扩展、贯通和破坏过程。并得到相应的应力应变关系曲线。还比较了多裂隙不同条数不同间距的影响以及试件有侧向围压的影响进而得到试件的强度包络线。并将这些结果数运用到一个地下的工程实例中去,分析对比了完整岩体和节理岩体中洞室的开挖后围岩体的破损状态的差异。
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Crack propagation of jointed rock and application
Abstract:Brittle media, such as rock mass, usually contain a great number of joints or cracks, which lead to varying mechanical properties and failure behaviors of different rock masses. In this paper, the DDARF method is adopted to simulate the crack initiation, propagation, coalescence and failure process in rock masses prefabricated with the different crack number and spacing under loading. The corresponding stress-strain curves and strength envelope are obtained. The parameters are applied in a case study. The differences in the failure behaviors of the intact and jointed rock masses after cavern excavation are analyzed and compared.
Keywords: Jointed rock Crack propagation DDARF method Stability analysis
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