冻融循环作用下EPS轻质土力学特性试验研究  

Experimental Study on Freeze Thaw Cycles of Lightweight Foamed Mixed Soil

作　　者：顾浩宇 梅利芳 GU Haoyu;MEI Lifang(School of Civil Engin.,Architecture and Environment,Hubei Univ.of Tech.,Wuhan 430068,China)

机构地区：[1]湖北工业大学土木建筑与环境学院,湖北武汉430068

出　　处：《湖北工业大学学报》2023年第5期110-114,120,共6页Journal of Hubei University of Technology

摘　　要：为研究轻质混合土在冻融循环作用下的物理和力学特性的变化规律,对不同EPS颗粒和水泥掺量下的轻质土试样进行冻融循环试验,在经历0、1、3、6、9次冻融循环时,对试样的体积、质量以及无侧限抗压强度进行测量。试验结果表明:随着水泥和EPS颗粒掺量的增加,轻质土的冻胀率和质量损失率会逐渐下降。通过无侧限抗压强度试验,得到了不同冻融循环次数下的轻质土应力应变曲线,结果表明轻质土的抗压强度会随着冻融循环次数的增加而降低,但当EPS颗粒掺量和水泥掺量提高后,轻质土抗压强度的损失速率明显降低。当EPS颗粒掺量达到2.5%时对改善强度损失改善效果不明显,可以认为2%EPS掺量为轻质土的“临界掺量”。基于数据建立了抗压强度和冻融次数之间的定量关系,两种函数均能反映在冻融循环后其抗压强度的劣化规律,为轻质土在严寒地区的应用提供了参考。In order to study the changes in the physical and mechanical properties of light-mixed soil under freezing and thawing cycles,the freezing and thawing cycle tests were carried out on light-mixed soil samples with different EPS particles and cement content.The volume,mass,and unconfined compressive strength of the samples were measured during 0,1,3,6,and 9 freezing and thawing cycles.The experimental results show that with the increase in cement and EPS particle content,the frost heave rate and mass loss rate of light soil will decrease gradually.Through the unconfined compressive strength test,the stress-strain curves of light soil under different freezing-thawing cycles were obtained.The experimental results show that the compressive strength of light soil decreases with the increase of freezing and thawing cycles,but the loss rate of the compressive strength of light soil can be effectively delayed with the increase of EPS particle content and cement content.However,this effect is not obvious when the content of EPS particles reaches 2.5%.It can be concluded that when the content of cement is fixed and the content of EPS particles is 2%,it is the critical content.Based on the experimental data,the quantitative relationship between compressive strength and freezing and thawing times is established.Both functions can reflect the deterioration law of compressive strength after the freezing and thawing cycle,which provides reference for the application of light soil in cold regions.

关 键 词：轻质土 冻融循环 质量损失 冻胀率 

分 类 号：TU411.6[建筑科学—岩土工程]