非饱和岩石温度-渗流-应力耦合模型研究

以研究岩石孔隙比和含水量两个基本量为出发点,考虑温度对渗流黏滞系数和孔隙比的影响、温度梯度引起的流体流动以及流体流动引起的热对流的影响,应用修正的Darcy定律、Fourier定律等,推导出非饱和岩石在温度–渗流–应力耦合作用下的平衡方程、流体物质守恒方程、气体质量守恒方程和能量方程。并将建立的多场耦合力学模型应用于一泥岩竖井的开挖、支护过程,重点分析围岩和衬砌内温度场、渗流场的变化规律,以及泥岩竖井在开挖、支护和运行过程中饱和度的变化规律。研究成果对我国地下石油、核废料储存以及高寒地区的隧道工程设计与施工具有重要的指导意义。

STUDY ON THERMO-HYDRO-MECHANICAL COUPLING MODEL FOR UNSATURATED ROCK

Considering the effects of temperature on the coefficient of viscosity and void ratio of liquid,liquid flow caused by temperature gradient,heat flow on water potential gradient and heat flow due to thermal convection,based on Darcy's law,Fourier's law,the equations of equilibrium,the conservation equations of mass and energy are derived using two basic variables for unsaturated porous media,i.e.void ratioe and volumetric liquid water content nl.And then the thermo-hydro-mechanical coupling model is applied to simulate the evolution law of unsaturated water flow in surrounding rock and concrete support of a claystone shaft with considering excavation and ventilation,by which the variations of pore pressure,temperature and saturation degree in claystone and concrete after tunnel excavation and ventilation are obtained.The study has significant effects for underground oil,nuclear waste disposal,design and construction for tunnel in cold regions.