岩石介质非均质性对破裂过程的影响研究

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摘要在虚内键模型的基础上，研究岩石介质非均匀性对宏观力学行为的影响。虚内键模型(VIB)认为，固体材料在微观上是由离散的质量微粒组成的，微粒之间由一虚内键连接，虚内键根据一种特定的连接法则，使得该模型在模拟固体材料破坏时不需要断裂准则，并根据微粒之间的相互作用推导出了材料的宏观本构方程。引入细观基元的两种状态——实体基元和空气基元，用来描述细观基元在荷载作用下细观损伤由量变到质变的渐进过程。通过对均质度系数m = 1.1，1.5，2.0，3.0，5.0的不同岩样破裂过程的模拟发现，均质度系数对岩样应力–应变曲线和宏观破坏模式有显著的影响：随均质度系数提高，应力–应变曲线峰前线性增强，峰值强度增大，峰后更为陡峭，破坏模式呈脆性模式。

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关键词 ：岩石力学, 非均质性, 虚内键模型, 岩石破裂, 演化函数

Abstract：Based on the virtual internal bond model，the influence of heterogeneity index on macroscopic behavior of rock failure is studied. It is deemed by discrete virtual internal bond model(VIB) that the solid materials are composed of quality materials at micro scale，the particles are connected by a VIB，based on a special cohesive force law，the VIB model could simulate the fracture of solid materials needing no fracture guideline，and the macro constitutive equation is drawn from the interactive of the particles. Two kinds of the elements’ state are proposed—the solid element and the air element，to describe the element?s condition under the pressure. By simulating the rock fracture process when the heterogeneity index m = 1.1，1.5，2.0，3.0，5.0，it is found that the heterogeneity has immense influence on the stress-strain curve and the fracture modes：with the higher heterogeneity index，the stronger linearity of the pre- stress-strain curve，and the higher peak stress，the deeper post stress-strain curve，and the fracture mode presents markedly brittle behavior.

Key words： rock mechanics heterogeneity virtual internal bond model rock failure evolvement function

收稿日期: 2010-03-12

引用本文:

柯长仁1，2，蒋俊玲2，葛修润1，3，肖本林2. 岩石介质非均质性对破裂过程的影响研究[J]. 岩石力学与工程学报, 2011, 30(S2): 4099-4103.
KE Changren1，2，JIANG Junling2，GE Xiurun1，3，XIAO Benlin2. NUMERICAL SIMULATION ON INFLUENCE OF HETEROGENEITY ON MACROSCOPIC FRACTURE PROCESS OF ROCK FAILURE. , 2011, 30(S2): 4099-4103.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/IS2/4099

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