地下岩体裂隙蠕变渗流耦合分析

陈俊国; 刘卫群; 梁浩楠

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长江科学院院报 ›› 2015, Vol. 32 ›› Issue (11) : 45-51.

岩土工程

地下岩体裂隙蠕变渗流耦合分析

陈俊国^1，2，刘卫群¹，梁浩楠¹

作者信息 +

Creep seepage Coupled Analysis of UndergroundFractured Rock Mass

CHEN Jun guo^1，2, LIU Wei qun¹, LIANG Hao nan¹

Author information +

文章历史 +

摘要

震后断层区岩体裂隙的愈合对于地震水力响应研究具有重要的作用。为研究裂隙岩体愈合对深部断层区渗透率时空演化规律的影响，在离散裂隙网络耦合模型基础上加入裂隙蠕变效应，建立裂隙岩体流固耦合时空演化模型，并利用COMSOL Multiphysics对建立的耦合方程进行求解。结果表明，封堵之前，常规的耦合渗流达到稳定状态，由于具有完整的通道，任意时刻的流固耦合并不能改变流体的压力。随着封堵发生，在蠕变效应下，裂隙开度减小，单元体渗透率降低，流体压力增大。该研究成果为震后破裂带岩体的愈合机理及渗透率演化分析提供了理论依据。

Abstract

Crackhealing of rock mass in fault zones after earthquake plays an important role for hydraulic response for the earthquake. In order to study the healing effect of fractured rock mass on the spatiotemporal evolution law of permeability in deep fault zones, we introduced creep effect of fracture to the network coupled model of discrete fractures. On this basis, a new spatiotemporal evolution model for fractured rock mass based on fluidsolid coupling was built, and the coupled equations were solved with the software of COMSOL Multiphysics. The results show that, before sealing, common coupled seepage achieves a steady state. Due to complete seepage channel, the fluidsolid interaction can’t change fluid pressure at any given time. As sealing happens, under the influence of creep, fracture aperture and permeability of unit body decrease, but fluid pressure increases. The conclusions can provide a theoretical basis for healing mechanism of rock mass and evolution analysis of permeability in fractured zones after earthquake.

导出引用

陈俊国，刘卫群，梁浩楠. 地下岩体裂隙蠕变渗流耦合分析[J]. 长江科学院院报. 2015, 32(11): 45-51

CHEN Jun guo, LIU Wei qun, LIANG Hao nan. Creep seepage Coupled Analysis of UndergroundFractured Rock Mass[J]. Journal of Changjiang River Scientific Research Institute. 2015, 32(11): 45-51

中图分类号： TU45

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