超高含水率水泥固化泥炭土压缩模量和固结系数研究

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (1): 60-67.

所属专题：水泥混凝土

超高含水率水泥固化泥炭土压缩模量和固结系数研究

陶然¹, 王荣¹, 范衍琦², 董俊全³, 史江伟³

1.中国港湾工程有限责任公司,北京 100027;
2.江苏省水利科学研究院材料结构研究所,扬州 225000;
3.河海大学岩土力学与堤坝工程教育部重点实验室,南京 210024

收稿日期:2021-08-13 修订日期:2021-10-13 出版日期:2022-01-15 发布日期:2022-02-10
通信作者: 史江伟,博士,副教授。E-mail:ceshijiangwei@163.com
作者简介:陶然(1988—),男,高工。主要从事港口工程设计施工与数字化的研究。E-mail:rtao@chec.bj.cn
基金资助:
国家自然科学基金(52178327);中央高校基本科研业务费项目(B200202082);江苏省水利科学研究院自主科研经费专项资金项目(2020z027)

Investigation of Compression Modulus and Consolidation Coefficient of Cement Solidified Peat with Ultra High Water Content

TAO Ran¹, WANG Rong¹, FAN Yanqi², DONG Junquan³, SHI Jiangwei³

1. China Harbour Engineering Company Limited, Beijing 100027, China;
2. Material and Structural Engineering Department of Jiangsu Water Research Institute, Yangzhou 225000, China;
3. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210024, China

Received:2021-08-13 Revised:2021-10-13 Online:2022-01-15 Published:2022-02-10

摘要/Abstract

摘要： 泥炭土具有高含水率、高有机质含量、大孔隙比和低剪切强度等特点。化学固化常用于提升泥炭土地基承载力和抵抗变形能力。通过开展单向固结试验,研究了含水率、有机质含量、pH值、水泥掺量和掺料粒径对水泥固化泥炭土压缩模量和固结系数的影响。研究表明,随着水泥掺量和养护龄期增加,水泥水化反应生成的凝胶不断增长,固化土压缩模量随之增长。泥炭土初始含水率从600%降至300%后,固化土压缩模量增加了3.5倍。有机质含量从40%增至80%(质量分数)时,固化土压缩模量降低了50%。pH值从7.0降至3.5时,固化土压缩模量降低了15.8%。固化泥炭土的压缩模量和固结系数受含水率、水泥掺量影响最大,有机质含量次之,pH值影响最小。掺石英砂能提升固化泥炭土的压缩模量,且石英砂粒径越小,固化土压缩模量增幅越大。

关键词: 高含水率, 泥炭土, 固化, 压缩模量, 固结系数, 地基工程

Abstract: Peat has the characteristics of high water content, high organic matter content, large void ratio and low shear strength. Chemical solidification can be used to improve the bearing capacity and deformation resistance of the soft ground. By conducting one-dimensional consolidation test, effects of water content, organic content, pH value, cement content and sand particle size on compression modulus and consolidation coefficient of cement solidified peat were systematically investigated. The results show that the amount of hydration reaction induced gel increases with the increase of cement content and curing age, resulting in an increase in compression modulus of solidified peat. By decreasing water content from 600% to 300%, the compression modulus of solidified peat increases by 3.5 times. The compression modulus of solidified peat decreases by 50% as organic content of peat increase from 40% to 80% (mass fraction). Moreover, the compression modulus of solidified peat decreases by 15.8% as pH value decrease from 7.0 to 3.5. Based on compression modulus and consolidation coefficient of solidified peat, water and cement contents have the greatest influence on solidified peat, followed by organic content and pH value. The modulus of solidified peat can be increased by adding quartz sand, and the smaller the size of sand particle, the greater the compression modulus.

Key words: high water content, peat, solidification, compression modulus, consolidation coefficient, foundation engineering

中图分类号:

TU41

陶然, 王荣, 范衍琦, 董俊全, 史江伟. 超高含水率水泥固化泥炭土压缩模量和固结系数研究[J]. 硅酸盐通报, 2022, 41(1): 60-67.

TAO Ran, WANG Rong, FAN Yanqi, DONG Junquan, SHI Jiangwei. Investigation of Compression Modulus and Consolidation Coefficient of Cement Solidified Peat with Ultra High Water Content[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(1): 60-67.

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超高含水率水泥固化泥炭土压缩模量和固结系数研究

Investigation of Compression Modulus and Consolidation Coefficient of Cement Solidified Peat with Ultra High Water Content

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