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工程地质学报  2018, Vol. 26 Issue (6): 1454-1462    DOI: 10.13544/j.cnki.jeg.2017-452
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EPS颗粒混合轻量土无侧限抗压强度特性试验研究
裴振伟, 侯天顺, 骆亚生
西北农林科技大学, 水利与建筑工程学院 杨凌 712100
EXPERIMENTAL STUDY ON UNCONFINED COMPRESSIVE STRENGTH OF SOIL AND EPS PARTICLES MIXTURES
PEI Zhenwei, HOU Tianshun, LUO Yasheng
College of Water Resources and Architectural Engineering, Northwest A & F University, Yangling 712100
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摘要 为研究EPS颗粒混合轻量土的密度、强度和变形特性,对不同水泥掺量、EPS颗粒掺量、含水率和龄期的轻量土进行密度无侧限抗压强度试验。试验配置轻量土无侧限抗压强度范围为103.2~1359.0 kPa,且随水泥掺量的增大呈指数关系增大的趋势,随EPS颗粒体积比的增大而呈线性关系减小的趋势。在大于最优含水率情况下,含水率越高,无侧限抗压强度越低,两者为指数关系,而龄期的增长能够使得轻量土的无侧限抗压强度呈双曲线增大的趋势。EPS颗粒混合轻量土的应力-应变关系曲线主要表现为应变软化型,含水率和EPS颗粒体积比的增大会使得轻量土的应力-应变关系曲线逐渐向硬化型转化。水泥掺量和龄期的增大能够增强轻量土的脆性特征,增大刚度。而含水率和EPS颗粒体积比的增大则使得轻量土的延性特征增强,刚度减小。研究成果对实际工程应用具有参考价值。
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裴振伟
侯天顺
骆亚生
关键词轻量土   密度   无侧限抗压强度   应力-应变关系   破坏应变   平均变形模量     
Abstract: This paper aims to study the density, strength and deformation characteristics of soil and EPS particles mixtures that is a type of light weight soil. It carried out the density tests and unconfined compressive strength tests of the mixed soil with different cement content, EPS content, age and water content. The results show the following findings. When volume ratio of EPS particals is 20% to 60%,the density range of the light weight soil is about 0.64g·cm-3~1.46g·cm-3. The amount of EPS particles has the greatest impact on the light weight soil density. When the volume rate of EPS particles is increased by 10%,the density of EPS particles light weight soil is decreased by about 0.15g·cm-3~0.23g·cm-3,which shows that it is feasible to realize the light weight of mixed soil by adding EPS particles. Cement content and water content have less influence on density of light weight soil. But age has little effect on density of light weight soil. In addition, when the volume ratio of EPS is 50%,the density of light weight soil is similar to that of water. The range of unconfined compressive strength of EPS particles light weight soil in this test is 103.2 kPa~1359.0 kPa, while the unconfined compressive strength of plain soil is 79.98 kPa. So it can be stated that the light soil in the proportioning of this test has better strength properties relative to the plain soil. The unconfined compressive strength of light weight soil increases exponentially with the increase of cement content. However, the larger the volume ratio of EPS particles, the smaller the unconfined compressive strength and the linear relationship between them. In the case of more than the optimal water content, with the increase of water content, the relationship between the unconfined compressive strength is reduced exponentially. The increase of age makes the unconfined compressive strength increase in hyperbolic form. The stress-strain relationship characteristics of EPS particles light weight soil are mainly characterized by strain softening type. However, the increase of water content and the increase of the content of EPS particles can make the stress-strain relationship curves of the light weight soil change gradually to the hardening type. Damage strain and average deformation model are used to describe the deformation characteristics of soil. The damage strain of light weight soil decreases with the increase of cement content, but the volume ratio of EPS particle is opposite. The greater the water content, the greater the damage strain of light weight soil. However, the increase of the age makes the damage strain of the sample decrease. When the volume ratio of EPS particles is more than 50%,the damage strain of light weight soil is greatly increased, and its brittleness is obviously weakened. The average deformation modulus is a parameter to characterize the stiffness of EPS particles light weight soil. The larger the cement content, the larger the average deformation modulus of light weight soil. However, the average deformation modulus of light weight soil decreases linearly with the increase of the volume ratio of EPS particles. The increase of water content can reduce the stiffness of light weight soil, and the longer the age, the greater the stiffness.
Key wordsLight weight soil   Density   Unconfined compressive strength   Stress strain relationship   Failure strain   Average deformation modulus   
收稿日期: 2017-09-18;
基金资助:国家自然科学基金项目(51509211),陕西省社会发展科技攻关项目(2015SF260),西北农林科技大学国际科技合作基金项目(A213021602),杨凌示范区科技计划项目(2016GY-01),中国博士后基金项目(2016M602863),中央高校基本科研业务费专项资金项目(Z102021848,Z109021807)资助
通讯作者: 侯天顺(1981-),男,博士,主要从事岩土力学与地质灾害防治方面的教学与科研工作.Email:houtianshunyx@sina.com;骆亚生(1967-),男,博士,主要从事黄土力学与工程方面的研究工作.Email:lyas1967@nwsuaf.edu.cn     E-mail: houtianshunyx@sina.com;lyas1967@nwsuaf.edu.cn
作者简介: 裴振伟(1992-),男,硕士生,主要从事轻量土力学特性研究.Email:pzwcj@sina.com
引用本文:   
裴振伟,侯天顺,骆亚生. EPS颗粒混合轻量土无侧限抗压强度特性试验研究[J]. 工程地质学报, 2018, 26(6): 1454-1462.
PEI Zhenwei,HOU Tianshun,LUO Yasheng. EXPERIMENTAL STUDY ON UNCONFINED COMPRESSIVE STRENGTH OF SOIL AND EPS PARTICLES MIXTURES[J]. Journal of Engineering Geology, 2018, 26(6): 1454-1462.
 
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