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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

42卷

期数:

2025年05期

页码:

181-190

栏目:

岩土工程

出版日期:

2025-09-30

文章信息/Info

Title:

Mechanical properties and constitutive simulation of cement-phosphogypsum stabilized peaty soil

文章编号:

1673-2049(2025)05-0181-10

作者:

屈俊童¹,浦钧翔¹,王文彬¹,刘新月¹,屈林河²

(1. 云南大学 建筑与规划学院,云南 昆明 650504; 2. 云南省城乡规划设计研究院,云南 昆明 650228)

Author(s):

QU Juntong¹, PU Junxiang¹, WANG Wenbin¹, LIU Xinyue¹, QU Linhe²

(1. School of Architecture and Planning, Yunnan University, Kunming 650504, Yunnan, China; 2. Yunnan Institute of Urban and Rural Planning and Design, Kunming 650228, Yunnan, China)

关键词:

泥炭质土;  水泥-磷石膏复合固化剂;  力学性能;  本构模型

Keywords:

peaty soil;  cement-phosphogypsum composite curing agent;  mechanical property;  constitutive model

分类号:

TU447

DOI:

10.19815/j.jace.2024.05011

文献标志码:

A

摘要:

为改善泥炭质土的不良工程性质,分别采用单掺水泥和混掺水泥-磷石膏复合固化剂两种方式对泥炭质土进行固化处理,通过无侧限抗压试验和三轴固结不排水剪切试验研究了不同固化剂掺量和围压对改良泥炭质土力学特性的影响,并取部分试样进行扫描电镜(SEM)和XRD物相分析试验,分析固化剂的反应机理。结果表明:水泥-磷石膏复合固化剂对泥炭质土的改良效果优于单掺水泥,磷石膏与水泥水化产物反应生成钙矾石,增强了土体的结构性,使土体的强度和刚度得到进一步提升; 然而过量的磷石膏并不会使钙矾石结晶增多,反而使土体的强度下降; 当水泥掺量为土样质量的20%时,磷石膏的最优掺量为水泥质量的30%; 增大水泥掺量能使土体黏聚力增长,却使内摩擦角发生小幅下降; 磷石膏的掺入使土体黏聚力增幅更大,但内摩擦角基本保持不变; 固化剂掺量的增加使得土体的应力-应变关系转变为应变软化型,邓肯-张模型对软化型曲线的模拟效果并不理想,基于Weibull分布的统计损伤本构模型更为适用。

Abstract:

In order to improve the poor engineering properties of peaty soil, both single-mixed cement and cement-phosphogypsum composite curing agent were utilized. The effects of different curing agent mixtures and confining pressures on the mechanical properties of treated peaty soils were investigated through unconfined compressive test and triaxial consolidation undrained shear test. Additionally, some specimens were taken for scanning electron microscopy(SEM)and XRD physical phase analysis to analyze the reaction mechanisms of the curing agents. The results show that the cement-phosphogypsum composite curing agent is more effective at enhancing peaty soil than cement alone. The reaction between phosphogypsum and the hydration products of cement produces ettringite, which enhances the soil's structural property, and improves the soil's strength and stiffness. However, an excessive amount of phosphogypsum does not increase the crystallization of ettringite but rather decreases the soil's strength. The optimal phosphogypsum dosage is 30% of the cement mass when the cement dosage is 20% of the soil sample mass. Increasing the cement content can increase the cohesion of the soil, but make the internal friction angle decrease slightly. The incorporation of phosphogypsum increases the cohesion of the soil, but the internal friction angle remains basically unchanged. The increase of curing agent content makes the stress-strain relationship of soil change into strain softening type. The simulation effect of Duncan-Chang model on softening type curve is not ideal, and the statistical damage constitutive model based on Weibull distribution is more suitable.

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相似文献/References:

备注/Memo

备注/Memo:

收稿日期:2024-05-07 投稿网址:http://jace.chd.edu.cn
基金项目:国家自然科学基金地区项目(52168038); 云南省科技厅基础研究项目(202301AT070192)
作者简介:屈俊童(1978-),男,工学博士,教授,E-mail:ern3632@163.com。
Author resume: QU Juntong(1978-), male, PhD, professor, E-mail: ern3632@163.com.

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更新日期/Last Update: 2025-09-25