CAJ | 학술논문

对不同含水率的杨凌、青海结构性黄土进行压缩试验,依据变形等效原则,用同一固结孔隙比下非饱和黄土与相同干密度饱和黄土的应力之差定义了结构流体等效应力,提出了压缩应力条件下结构性黄土的有效应力原理.探讨了结构流体等效应力与饱和度(含水率)及应力之间的关系,发现含水率较低时黄土的结构流体等效应力与应力之间呈线性关系,并基于此结构流体等效应力,提出了湿载耦合时结构流体等效应力的表达式.依据压缩应力条件下结构性黄土的有效应力原理,引入能够反映结构性变化的结构流体等效应力,在饱和黄土压缩曲线的基础上建立了结构性黄土压缩曲线模式,根据此模式可以确定湿载耦合时的总应力压缩曲线和有效应力压缩曲线,计算结果与试验结果吻合较好,为计算其增湿湿陷变形提供了一条新的途径.
대불동함수솔적양릉、청해결구성황토진행압축시험,의거변형등효원칙,용동일고결공극비하비포화황토여상동간밀도포화황토적응력지차정의료결구류체등효응력,제출료압축응력조건하결구성황토적유효응력원리.탐토료결구류체등효응력여포화도(함수솔)급응력지간적관계,발현함수솔교저시황토적결구류체등효응력여응력지간정선성관계,병기우차결구류체등효응력,제출료습재우합시결구류체등효응력적표체식.의거압축응력조건하결구성황토적유효응력원리,인입능구반영결구성변화적결구류체등효응력,재포화황토압축곡선적기출상건립료결구성황토압축곡선모식,근거차모식가이학정습재우합시적총응력압축곡선화유효응력압축곡선,계산결과여시험결과문합교호,위계산기증습습함변형제공료일조신적도경.
The compression tests are conducted on Yangling and Qinghai structural loesses under different water contents. Based on the principle of equivalent deformation, the equivalent stress of structure fluid is defined by using compression stress difference between unsaturated and saturated loesses under the same consolidation void ratio . The effective stress principle of unsaturated structural loess is established under compression stress. Relations between equivalent stress of structure fluid and degree of saturation as well as stress are investigated. The relation between equivalent stress of structure fluid and stress is linear as the water content is lower. Based on the equivalent stress of structure fluid under lower water content, the formula of equivalent stress of structure fluid is proposed which can reflect coupling of stress and moisture. According to effective stress principle of unsaturated structural loess under compression stress and introducing equivalent stress of structure fluid reflecting the structure change, the formula of compression of structural loess is established. The compression curves of total stress and that of effective stress can be calculated under the coupling of stress and moisture by the formula. The calculating results are accord with the test results, so as to offer a new approach to evaluating unsaturated collapsibility.