土石混合体的研究现状及研究展望

土石混合体是不同于岩体与土体的一种地质材料,其物理力学特性的研究越来越受到工程界关注。本文首先介绍了土石混合体概念的提出,并以土石混合体在我国的广泛分布特点与工程中的诸多实际问题阐述了其研究具有重要的工程价值与理论意义。另一方面,通过大量与土石混合体相关的文献检索与分析,本文从力学试验、几何结构研究和数值模拟等不同方面总结了近年来土石混合体研究的成果,指出结构效应是土石混合体重要而又特有的一个特征,其几何结构模型与数值模拟的研究也取得了许多重要而有价值的成果。最后,针对土石混合体研究中仍存在的不足,本文展望并探讨了土石混合体今后的研究方向,提出了地质成因与物质组成结构特征、水与土石混合体的耦合作用、土石混合体三维数值模拟研究、以及土石混合体力学参数快速确定方法等4个方面的研究内容与研究思路。

CURRENT STATUS AND FUTURE TRENDS OF STUDIES ON ROCK AND SOIL AGGREGATES (RSA)

Rock and soil aggregate(RSA) is a kind of geological material which is different from rock mass and soils in physical and mehanical behaviors.Recently the study on RSA has drawn more and more attention from the engineering and geomechanical field.In this paper the term of RSA is introduced firstly.The importance of the study on RSA is proved due to RSA distributing widely in China and resulting in many engineering problems.On the other hand,this paper presents an overview of the published literature on RSA,including mechanical tests,geometric structure,numerical simulation and so on.It is shown that structural effects play an important role on the mechanical properites of RSA,and some previous studies on geometric structures and numerical simulation of RSA are instructive and positive to the future study.Finally,considering the lack of knowledge on RSA,this paper discusses and suggests the future studies on RSA.Four research orientations about RSA are put forward such as the geological origin and fabric charteristics,couplling interaction between water and RSA,3D simulation on RSA,and procedure of quickly determining the mechanical parameters of RSA;and the tentative methods of solving these problems are also suggested.