非饱和土中的流-固耦合研究

Study for fluid-solid coupling process in unsaturated soil

概述了非饱和土变形.渗流相互作用的多相流.固耦合理论的研究进展。重点讨论了在理论研究和实际应用方面所存在的几个主要问题,其中包括理论控制方程组描述、土-水特征曲线、固体骨架的弹塑性本构模型以及各种数值算法等研究。另外,就该理论在降雨入渗滑坡、土体的蒸发固结效应等问题的应用进行了简单的讨论,并指出了目前应用的热点和新的研究领域。研究结果表明,进一步发展非饱和土流.固耦合理论对解决非饱和土力学和环境地质灾害的工程问题有着重要的意义。

The paper shows a brief review of the fluid-solid coupling theory in terms of the interaction between soil deformation and fluid seepage in the unsaturated soil. Several major issues in both theoretical study and practical application are mainly discussed, including theoretical governing equations, soil-water characteristic curve, elastoplastic constitutive models of the solid skeleton and methods of numerical analysis. Besides, rain infiltration on slope and the desiccation-consolidation effect of clay, two practical problems of geotechnical engineering are taken as examples to make some explication. The paper also points out the hot issue of application and the new study field. Thus, a further developing the coupling theory of the unsaturated soil will promote the solution of engineering problems in both unsaturated soil mechanics and geoenvironmental disasters.