土石混合体重塑样制备及其压密特征与力学特性分析  

SAMPLE REMODELING,COMPACTNESS CHARACTERISTIC AND MECHANICAL BEHAVIORS OF ROCK-SOIL MIXTURES

作　　者：廖秋林[1,2] 李晓[1] 李守定[1] 

机构地区：[1]中国科学院地质与地球物理研究所中国科学院工程地质力学重点实验室,北京100029 [2]北京城建集团建筑工程总承包部,北京100088

出　　处：《工程地质学报》2010年第3期385-391,共7页Journal of Engineering Geology

基　　金：国家重点基础研究发展规划(973)项目(No.2009CB724605);国家自然科学基金资助项目(40702052);中国科学院知识创新工程重要方向项目(No.KJCX3-SW-L1;No.KZCX2-YW-109)

摘　　要：基于土力学与岩石力学的实验室力学试验原理与方法,本文首先探索了土石混合体重塑样的制备、压密特性等问题,初步给出土石混合体重塑样制备的一个标准流程,并揭示了土石混合体的压密特性与机制,即土石混合体压密主要是土体的压密,但块石直接影响其压密效果,并指出本次试验土石混合体50锤次可达到的最佳压密效果,而压密机制随含石量增加而有所变化。运用高精度岩石试验机,首次进行了土石混合体的单轴压缩试验。试验表明,在无侧限条件下块石与土体无胶结,导致了试样实际承载面积减小,使其抗压强度与弹模反而低于土体;而土石混合体中块石形成骨架结构的力学响应是土石混合体的一个重要的力学特性。According to experimental theory and method of soil mechanics and rock mechanics,this paper studies equipments,methods requirements for sample remodeling of rock-soil mixtures（RSM）.A standard procedure for sample remodeling of RSM is proposed.Compactness characteristic and mechanism of RSM are analyzed by comparing lots of remodeling RSM samples with soil samples.The compactness of RSM in sample remodeling is completed as a result of the compactness of the soil in RSM in fact.The uniaxial compression of RSM is firstly carried out by utilizing high-precision rock test rig.Some important test data are obtained to explore the mechanical behaviors of RSA.It is shown that the compression strength,Young＇s modulus of RSM are lower than those of soils under the uniaxial compression,which contradicts to the common consensus.This contradiction could be explained with the poor contact mode between the rock blocks and soils in RSM,where the skeleton structure composed of rock blocks in RSM beard the main loading under unconfined compression while the soils in RSM did little.Overall,the skeleton structure composed of rock blocks in RSM is crucial to the compression strength,Young＇s modulus,characteristic of deformation and failure for RSM.It also is an important mechanical behavior of RSM.

关 键 词：土石混合体 单轴压缩试验 重塑样 压密特征 骨架结构 

分 类 号：TU443[建筑科学—岩土工程]