固化盐渍土的力学性能  

Mechanical properties of solidified saline soil

作　　者：周永祥[1] 阎培渝[2] 冷发光[1] 纪宪坤[1] 

机构地区：[1]中国建筑科学研究院建筑材料研究所,北京100013 [2]清华大学土木工程系,北京100084

出　　处：《铁道科学与工程学报》2009年第1期31-35,共5页Journal of Railway Science and Engineering

基　　金：国家863项目(2003AA33X100);中国建筑科学研究院应用研究项目(20080116330730002)

摘　　要：对2种原生盐渍土和1种非盐渍土的固化体进行单轴无侧限抗压试验和抗折试验,在ANSYS中建立有限元模型,分析试件的破坏形态,并利用单轴无侧限抗压的试验数据,计算得到模拟三轴加载的应力-应变曲线。结果表明:盐渍土和非盐渍土的固化体在力学性能上没有本质的区别;固化剂掺量较低时,固化土试件具有明显的塑性特征;随着固化剂掺量的增加,试件的抗压强度增大,弹塑性特征明显,并逐渐显示出脆性破坏的特征。典型的单轴无侧限抗压应力-应变曲线可分为3个阶段,即弹性段、塑性硬化段和软化段。在抗折试验中,固化剂掺量高的试件发生脆性断裂。Two kinds of natural saline soils and a sort of non - saline soil were solidified using soil stabilizer and the uniaxial unconfined compression and three -point bend tests of prismy specimens were executed. A finite element model was built in ANSYS for investigating cracking and failure shapes, and also computing the stress - strain curve under simulating triaxial loading by inputting experimental data obtained from uniaxial unconfined compression test. The results indicate that the solidified saline soil has no essential difference in mechanical properties with solidified non -saline soil. The specimens containing less stabilizer have obvious plastic behavior. With the increase of stabilizer content, the specimens have higher compressive strength and more distinct e- lastic - plastic behavior and tend to brittle failure. A representative stress - strain curve under uniaxial unconfined compression has three stages： Elastic stage, plastic hardening stage and softening stage. In three - point bend test; brittle fracture occurs in the specimens containing more stabilizer.

关 键 词：固化盐渍土 单轴无侧限抗压 三轴加载 应力-应变曲线 有限元分析 

分 类 号：TU472.5[建筑科学—结构工程] TU448[建筑科学—土工工程]