水泥固化高填方黄土抗压强度特性及其影响因素

doi:10.16552/j.cnki.issn1001-1625.2024.1146

摘要/Abstract

摘要： 明确水泥固化黄土抗压强度特性是评判黄土地基加固效果的基础依据。以延安新区高填方黄土为研究对象,开展不同试验条件下水泥固化黄土无侧限抗压强度试验和直剪试验,分析水泥掺量、养护龄期、压实程度、湿度状态和浸水环境对无侧限抗压强度的影响规律,探明水泥固化黄土抗压强度与抗剪强度、变形模量之间的关联性特征。研究结果表明:水泥固化黄土受压破坏后表观产生30°~40°的贯通斜裂缝,呈脆性破坏特征;水泥固化黄土应力-应变曲线为应变软化型,可分为线弹性阶段、塑性屈服阶段、应力衰减阶段和残余稳定阶段;水泥固化黄土无侧限抗压强度与水泥掺量、养护龄期和压实程度均呈线性增长关系,水泥掺量、养护龄期和压实程度越大,无侧限抗压强度越高,但无侧限抗压强度增长幅度逐渐减缓;水泥固化黄土无侧限抗压强度与初始含水率呈幂函数衰减趋势;浸水环境下水泥固化黄土无侧限抗压强度发生衰减,浸水后试样的无侧限抗压强度较浸水前减小了26%以上;水泥固化黄土无侧限抗压强度与抗剪强度、变形模量之间均呈线性相关关系,黏聚力为无侧限抗压强度的20%~30%,变形模量为无侧限抗压强度的23~250倍。

关键词: 高填方黄土, 水泥固化黄土, 无侧限抗压强度, 破坏模式, 影响因素

Abstract: Evaluating the reinforcement effect of loess foundation involves determining the compressive strength characteristics of cement-solidified loess, which serves as the basis for analysis. Using high fill loess in Yan'an New Area as the subject, the unconfined compressive strength tests and direct shear tests were conducted under various conditions to analyze the effects of cement content, curing age, compaction degree, moisture level, and immersion environment on unconfined compressive strength. The correlation between compressive strength, and shear strength, deformation modulus of cement-solidified loess was investigated. The findings indicate the occurrence of oblique cracks at 30°~40° angles in cement-solidified loess following compression failure, demonstrating brittle failure characteristics. The stress-strain curve of cement-solidified loess exhibits a strain-softening behavior, encompassing elastic stage, plastic yield stage, stress decay stage, and residual stability stage. The unconfined compressive strength of cement-solidified loess demonstrates a linear increase with higher cement content, longer curing age, and greater compaction degree. However, the rate of increase gradually diminishes as these factors escalate. Additionally, the unconfined compressive strength decreases exponentially with initial water content. The unconfined compressive strength of cement-solidified loess decreases under water immersion condition, and the unconfined compressive strength of the samples after water immersion is more than 26% lower than that before water immersion. Furthermore, there is a linear correlation between the unconfined compressive strength of cement-solidified loess and shear strength as well as deformation modulus. The cohesion represents approximately 20%~30% of unconfined compressive strength, and the deformation modulus is 23~250 times of unconfined compressive strength.

Key words: high fill loess, cement-solidified loess, unconfined compressive strength, destruction mode, influencing factor

中图分类号:

TU473

邱明明, 杨萌, 李晓敏, 李盛斌. 水泥固化高填方黄土抗压强度特性及其影响因素[J]. 硅酸盐通报, 2025, 44(5): 1927-1938.

QIU Mingming, YANG Meng, LI Xiaomin, LI Shengbin. Compressive Strength Characteristics and Its Influencing Factors of High Fill Loess Solidified by Cement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(5): 1927-1938.

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