胶结和孔隙比对结构性土力学特性的影响  

Effect of bonding and void ratio on the mechanical behavior of structured soil

作　　者：李建红[1] 张其光[1] 孙逊[1] 张丙印[1] 

机构地区：[1]清华大学水利水电工程系,水沙科学与水利水电工程国家重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2008年第9期1431-1435,共5页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(50479007)

摘　　要：结构性土具有与重塑土不同的力学特性,为了探讨胶结和孔隙比等物理因素对其影响,该文对具有不同胶结强度和干密度的人工制备结构性土以及相应的重塑土进行了对比常规三轴试验。试验结果表明,胶结可"滞后"土体的变形,使得结构性土在等向压缩条件下的e-lgp曲线发生转折。结构性土的破坏随围压的升高可依次出现纵向劈裂、剪切带和均匀剪切破坏等3种方式。胶结和孔隙比使得结构性土的变形模量和体变变化规律与重塑土差异很大,同时对结构性土的应变软化和剪胀特性也有显著影响。Structured soil has very than remolded soil. In this paper, artificial structured soil with various different mechanical behavior conventional triaxial tests on bondings and void ratios were carried out to analyze the effects of both factors on the mechanical behavior of the soil. The experimental results show that bonding makes the e-lgp curve of the structured soil nonlinear and the structured soil failure modes classified as vertical cleft, shear band, and homogenous damage developing on the confining pressure. The bonding and the void ratio cause the modulus and the volumetric strain of the structured soil to differ from that of remolded soil. Thus, the bonding and void ratio also strongly affect the mechanical behavior of dilation and the strain-softening of structured soil.

关 键 词：人工结构性土 胶结 孔隙比 力学特性 常规三轴试验 

分 类 号：TU411.1[建筑科学—岩土工程]