三维应力作用下砂砾岩孔隙型渗流  

Porous seepage in calcirudite rock with 3-D stresses

作　　者：叶源新[1] 刘光廷[1] 

机构地区：[1]清华大学水利水电工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2007年第3期335-339,共5页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金委员会基金;二滩水电开发有限责任公司雅砻江水电开发联合研究基金资助项目(50539020)

摘　　要：为了掌握砂砾岩在三维应力作用下的渗流规律,开展了理论和试验研究。把渗透系数设定成孔隙率变化量的函数,再基于孔隙弹性理论推导孔隙率变化量和应力之间的关系,建立了孔隙型岩石的渗流应力耦合特性关系式,其表明平均有效应力是控制孔隙型岩石渗透系数变化的主要因素。在渗流-三轴应力耦合试验机上开展的砂砾岩渗流应力耦合试验的结果进一步证明,砂砾岩渗透系数与平均有效应力成负指数函数关系。根据理论分析和试验结果建立了砂砾岩在三维应力作用下的耦合特性关系模型。Seepage in calcirudite with 3-D stresses was modeled theoretically and measured in the laboratory. The analysis assumes that permeability is a function of variations of the porosity. Poro-elasticity theory was then used to deduce the relationship between the porosity and the stress to couple the seepage characteristics with the stresses in the porous rocks. The mean effective stress is found to be the key factor controlling the variation of the permeability. The seepage in calcirudite was then measured experimentally as a function of the 3-D stresses. The results show that the calcirudite permeability is inversely related to the mean effective stress. The results also show that the model reasonably represents the coupling between the seepage and the 3-D stresses in calcirudite rock.

关 键 词：砂砾岩 渗流应力耦合 三维应力 平均有效应力 

分 类 号：TV139[水利工程—水力学及河流动力学]