Mechanical properties of cement treated zinc-contaminated loess
- Journal of Northwest University (Natural Science Edition) Vol. 54, Issue 1, Pages: 33-41(2024)
- 作者机构：
西北大学 地质学系/大陆动力学国家重点实验室，陕西 西安 710069
- 作者简介：
- 基金信息：
DOI：10.16152/j.cnki.xdxbzr.2024-01-005
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CHEN Hanjiang, CUI Suli, ZHANG Dengfei, et al. Mechanical properties of cement treated zinc-contaminated loess. [J]. Journal of Northwest University (Natural Science Edition) 54(1):33-41(2024)
CHEN Hanjiang, CUI Suli, ZHANG Dengfei, et al. Mechanical properties of cement treated zinc-contaminated loess. [J]. Journal of Northwest University (Natural Science Edition) 54(1):33-41(2024) DOI： 10.16152/j.cnki.xdxbzr.2024-01-005.
摘要
聚焦于重金属污染黄土而劣化的实际工程问题，探究水泥固化重金属污染黄土的强度、应力－应变特性，以水泥固化锌离子污染黄土为研究对象，考虑水泥掺量和养护龄期的影响，进行无侧限抗压强度的系列试验，分析其应力－应变曲线、无侧限抗压强度、破坏应变、变形模量的变化规律，进而构建水泥固化锌离子污染黄土在无侧限条件下的应力－应变本构模型。研究表明，经水泥固化后的锌离子污染黄土应力－应变曲线为强软化型，试样呈脆性破坏，可分为弹性、弹塑性、应力下降、残余稳定4个阶段；随着养护龄期、水泥掺量的增加，无侧限抗压强度增大，破坏应变基本呈现减小趋势；变形模量与无侧限抗压强度呈现非线性关系；构建的考虑养护龄期、水泥掺量影响的应力－应变本构模型，可准确描述水泥固化锌离子污染黄土单轴压力下的变形全过程。
Abstract
A series of studies were carried out to examine the strength and stress-strain characteristics of cement-treated heavy metal-contaminated soil, with an emphasis on the actual engineering issue of heavy metal-contaminated loess and its deterioration.The research focused specifically on cement-treated zinc-contaminated loess, taking into consideration the influence of cement content and curing time. The experiments aimed to analyze the changes in the stress-strain curve, unconfined compressive strength, failure strain, and deformation modulus, and to construct a model of the stress-strain behavior under unconfined conditions. Additionally, a stress-strain model was developed for cement-treated zinc-contaminated loess under no-lateral limit conditions.The study reveals that the stress-strain curve of cement-treated zinc-contaminated loess exhibits strong softening behavior, resulting in brittle specimen damage. The curve can be divided into four stages: elasticity, elastic-plasticity, stress reduction, and residual stability. Furthermore, the study finds that with an increase in curing time and cement content, the unconfined compressive strength improves while the failure strain generally decreases. The deformation modulus shows a non-linear relationship with the unconfined compressive strength. A stress-strain model is constructed to describe the non-linear relationships among curing time, cement content, deformation modulus, and unconfined compressive strength accurately. Specifically, the model considers the effects of curing time and cement content on the stress-strain behavior of cement-treated zinc-contaminated loess under uniaxial pressure.Overall, these findings contribute to understanding the strength and stress-strain characteristics of cement-treated zinc-contaminated loess and provide valuable insights for addressing heavy metal contamination in loess engineering applications.
关键词
固化锌污染黄土重金属变形模量无侧限抗压强度应力－应变曲线
Keywords
solidificationzinc-contaminated loessheavy metaldeformation modulusunconfined compressive strengthstress-strain curve
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