岩体水力劈裂的细观PFC-CFD联合分析

doi:10.13722/j.cnki.jrme.2014.0878

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摘要

现有关于水力劈裂的研究成果多基于宏观连续介质方法，难以揭示水力劈裂细观机制，借助颗粒离散元在材料破碎及裂纹动态发展研究方面的优势，提出从细观层面实现裂纹扩展动态分析的PFC-CFD联合求解法，并采用圆环岩体试件的简化模型验证了该方法的可行性。随后以一隧洞工程为背景，采用该方法对隧洞开挖过程中裂纹扩展情况进行模拟，分析非稳定渗流阶段，掌子面与高压水源距离不同(掘进过程)对隧洞裂纹扩展的影响。研究结果表明：建立的耦合分析方法能够较好地模拟岩体水力劈裂的破坏过程，可用于隧洞工程的安全性评价。

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关键词 ：岩石力学；深埋隧洞；水力劈裂；细观；流&ndash, 固耦合模型

Abstract：

Existing studies on hydraulic fracturing are mainly based on macroscopic continuum method. It is difficult to reveal the microscopic mechanism of hydraulic fracturing. Taking advantage of PFC in modeling material failure and crack propagation，we developed a coupled PFC-CFD method for analyzing crack propagation in meso-level and verified by a simplified model test of a cylinder rock specimen. Then taking a tunnel project for example，we simulate the crack propagation in the process of tunnel excavation used this method and analyze the effects of the distance between the tunnel face and the high-pressure water source on the crack propagation in unsteady state seepage stage. The result shows that the coupled method is very suitable to simulate the processes of hydraulic fracturing in rock and could be applied to safety assessment in tunnel projects.

Key words： rock mechanics deep tunnel hydraulic fracturing microscopic fluid-solid couple model

引用本文:

倪小东1，2，赵帅龙1，2，王媛1，2，魏鹏1，2. 岩体水力劈裂的细观PFC-CFD联合分析[J]. 岩石力学与工程学报, 2015, 34(S2): 3862-3870.
NI Xiaodong1，2，ZHAO Shuailong1，2，WANG Yuan1，2，WEI Peng1，2. NUMERICAL ANALYSIS OF HYDRAULIC FRACTURING OF ROCK MASS ON MESOSCOPIC LEVEL BY COUPLED PFC-CFD METHOD. , 2015, 34(S2): 3862-3870.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2014.0878 或 https://rockmech.whrsm.ac.cn/CN/Y2015/V34/IS2/3862

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