土石混合体概念、分类及意义

Conception,classification and significations of soil-rock mixture

土石混合体的概念是随着当今各类大规模工程建设的开展而逐渐被提出来的,其物理力学性质的研究也是岩土力学及地质工程界共同面临的研究课题。由于目前对土石混合体的研究仍然处于初级阶段,在传统的岩土体分类体系中未将其独立出来,且未见有对土石混合体这一复杂岩土介质的概念及相应分类体系的系统论述。本文在总结目前国内外岩土体分类体系及以往研究成果的基础上,对土石混合体的概念及其关键问题进行了详细的论述,指出土石混合体是指第四纪以来形成的,由具有一定工程尺度、强度较高的块石、细粒土体及孔隙构成且具有一定含石量的极端不均匀松散岩土介质系统,其中可视粒径、土/石阈值、"土"与"石"的强度特征及含石量四个参数是土石混合体概念中的关键问题。

With the development of all kinds of large scale engineering projects, soil-sock mixture （S-RM） as a new geotechnical material was proposed. And the study on the physical and mechanical properties of S-RM is the research project that the rock ＆ soil mechanics and engineering geologist together faces now. As the study of S-RM is still at primary stage, S-RM is not separated from the traditional classification system of geotechnical materials, and there is no systematic discuss on the conception and elassification of S-RM. Based on the present classifieation system of geoteehnieal materials and the former research aehievements, the paper discusses on the conception and the key problems of S-RM in detail, and points that S-RM is a kind of extreme inhomogeneous geotechnical materials which is formed in Quaternary period and composed of large rock block, fine grained soil, pores and with certain percentage of rock block. The maximum observable dimension （MOD）, soil/rock threshold （S/RT）, strength comparison between soil and rock and percentage of rock block are the four key factors in the conception of S-RM.