岩体单裂隙流固热化学耦合作用数值模拟研究  

Numerical simulation of fluid- mechanical- thermal- chemical coupling effect in single fractured rock mass

作　　者：田晓丹[1] 姜晓桢[2] 

机构地区：[1]河海大学文天学院水利工程系,安徽马鞍山243000 [2]南京水利科学研究院岩土工程研究所,江苏南京210024

出　　处：《人民长江》2015年第9期84-90,共7页Yangtze River

基　　金：国家自然科学基金资助项目(50779012)

摘　　要：为全面研究渗流、应力、化学、温度影响下岩体裂隙的变化,建立了岩体单裂隙的流-固-热-化四场全耦合数学模型,并以Comsol Multiphysics软件为基础,将该数学模型转化为一个统一的偏微分方程组,实现了四场全耦合数值求解。该模型给出了更接近真实物理过程的数值解答,避免用松散耦合法求解多场耦合问题带来的误差。同时通过对两个实例的计算模拟,分析了在渗流、压应力、水化学溶蚀和温度等多因素耦合作用下,岩体单裂隙渗透特性的变化规律,得出了裂隙岩体渗透特性的影响机理和关键影响因素。To study the change of permeability of the rock fissure under influences of coupling effects of seepage, stress, chemistry and temperature, a full coupled hydraulic - mechanical - chemical - thermal numerical model is established for a single fissure in a rock mass. The model is transferred into a set of differential equations, which are solved by Comsol Multiphysics. It avoids the errors in other loose coupling algorithms and the result is closer to the reality. Two examples are employed to analyze the variation law of permeability of the single rock fissure under the complex coupling of seepage, compression, hydro - mechanical corrosion and thermal effects, the main influential factors and mechanism of permeability change in fractured rocks are also revealed.

关 键 词：岩体裂隙 渗透特性 多场耦合 数值模拟 

分 类 号：P642[天文地球—工程地质学]