三轴应力状态下不同湿度原状黄土的结构性定量化参数  

STRUCTURAL QUANTITATIVE PARAMETER OF INTACT LOESS WITH DIFFERENT WATER CONTENTS UNDER TRIAXIAL STRESS CONDITION

作　　者：陈存礼[1] 高鹏 唐杰[1] 

机构地区：[1]西安理工大学岩土工程研究所,陕西西安710048 [2]核工业工程勘察院,河南郑州450022

出　　处：《岩石力学与工程学报》2006年第11期2313-2319,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：陕西高校省级重点实验室重点科研项目(03JS038)西安理工大学高学历人员科研启动项目(220603)

摘　　要：通过对黄土结构性研究现状的分析,对与原状样干密度相同的扰动饱和土施加荷载来实现破坏结构性的目的,以三轴试验得到的原状黄土以及扰动饱和黄土的应力-应变曲线为基础,用一个定量化结构性参数综合反映土的排列和胶结特征所表现出的综合结构势(结构性强弱),探讨不同围压及含水量下结构性参数在剪切过程中的变化特性。研究结果表明：(1)定义的结构性参数能够反映围压、含水量对原状黄土剪切过程中结构性的影响,具有很好的合理性、灵敏性和稳定性；(2)结构性参数随着含水量的增大而减小,低应变时含水量对结构性的影响很明显,这种影响随着应变增大而逐渐减弱；(3)初始加荷和试样破坏时,结构性参数随着围压的增大而减小,应变达到15%时,结构性参数随着围压的增大呈先增大后减小的趋势。The existing state of structural studies is discussed. Load is applied on disturbed saturated loess samples with the same dry density in order to destroy the structure of intact loess. Based on the stress-strain curves obtained by triaxial compression tests of intact loess and disturbed saturated loess, the quantitative comprehensive structural parameter is used, which can reflect not only the arrangement but also the coherent structure of soil particles. The effects of water content and confining pressure on the structural parameter are investigated during the shear course. The study indicates that （1） structural parameter can not only reveal the influences of water content and confining pressure on the structure of the intact loess under shear, but also is of rationality, sensitivity and stability： （2） structural parameter decreases with the increase of water content, and this change tendency decreases with the increase of strain; and （3） when initial loading is applied and failure of sample occurs, structural parameter decreases with increase of confining pressure, and when strain reaches 15%, structural parameter firstly increases and then decreases with the increase of confining pressure.

关 键 词：土力学 原状黄土 含水量 三轴试验 结构性 结构性参数 

分 类 号：TU44[建筑科学—岩土工程]