学术活动

多相孔隙介质的化学-力学耦合问题——概念与模型 Chemomechanical behavior of multiphasic porous media: Conception and formulation
发布时间:2017-12-08 阅读次数:5206次

报告人:韦昌富研究员,中国科学院武汉岩土力学研究所

    间:20171212日(星期二)下午15:00

    点:隧道中心楼206

报告人:

韦昌富博士现为中国科学院武汉岩土力学研究所研究员,入选中国科学院百人计划、国家国家百千万人才工程,并获国家有突出贡献专家称号。1988年本科毕业于合肥工业大学自然与环境科学系,1991年于中国科学院力学研究所获固体力学硕士学位,2001年于美国俄克拉荷马大学获博士学位;目前为岩土力学与工程国家重点实验室副主任、国际土力学与岩土工程学会非饱和土力学专业委员会委员、中国力学学会岩土力学专业委员会常务委员、中国土木工程学会土力学与岩土工程学会非饱和土专业委员会副主任委员、《岩土力学》和《岩土工程》学报编委。发表论文150余篇,其中SCI论文50多篇;获国家发明专利授权15项。

报告简介:

Physicochemical effect remains elusive, either experimentally or theoretically, in poromechanics. In this talk, I present a new theoretical approach to modelling the chemomechanical behaviour of multiphase porous media, in general, and unsaturated soils, in particular, which can address skeletal deformation, fluid flow, heat conduction, solute diffusion, chemical reaction, and phase transition in a consistent and systematic way. In this context, the concepts of matric potential and matric suction are redefined, and the chemical potential of a fluid species is formulated with explicitly accounting for the effects of osmosis, capillarity, and adsorption; the composition of pore water pressure is identified, and explicit formulations are developed for the effective stress and intergranular stress with considering physicochemical effects. It is shown that the negative water pressure measured by a conventional transducer can be significantly different than the true pore water pressure. It is also theoretically revealed that, other than the soil-water characteristic function, a new pressure (or potential) function accounting for the physicochemical effects is generally required in analyzing the coupled chemo-mechanical processes in unsaturated soils. The new theory is capable of explaining many salient phenomena occurring in water-saturated porous media with a degree of saturation varying from an extremely low value to 100%, including Donnan osmosis, capillary fringe, air entry value, initial hydraulic head during seepage and pressure solution.

发布人:蔡国庆(岩土系)