泡沫轻质混凝土常规三轴压缩力学性能研究

doi:10.16552/j.cnki.issn1001-1625.2025.0258

硅酸盐通报 ›› 2025, Vol. 44 ›› Issue (9): 3246-3254.DOI: 10.16552/j.cnki.issn1001-1625.2025.0258

泡沫轻质混凝土常规三轴压缩力学性能研究

杨青原^1,2, 王垚², 单红日¹, 李辉^2,3, 陈聪¹, 姜能栋^2,4

1.济青高速铁路有限公司,济南 250000;
2.山东大学齐鲁交通学院,济南 250002;
3.中科智岩(山东)科技发展有限公司,临沂 277712;
4.山东铁路投资控股集团有限公司,济南 250102

收稿日期:2025-03-10 修订日期:2025-04-30 出版日期:2025-09-15 发布日期:2025-09-19
通信作者: 姜能栋,博士研究生。E-mail:jiangnengdong@mail.sdu.edu.cn
作者简介:杨青原(1987—),男,高级工程师。主要从事铁道工程方面的研究。E-mail:328572866@qq.com
基金资助:
山东省泰山产业领军人才工程(tscy20230660)

Conventional Triaxial Compressive Mechanical Properties of Foamed Lightweight Concrete

YANG Qingyuan^1,2, WANG Yao², SHAN Hongri¹, LI Hui^2,3, CHEN Cong¹, JIANG Nengdong^2,4

1. Jinan-Qingdao High-Speed Railway Co., Ltd., Jinan 250000, China;
2. School of Qilu Transportation, Shandong University, Jinan 250002, China;
3. Zhongke Zhiyan (Shandong) Technology Development Co., Ltd., Linyi 277712, China;
4. Shandong Railway Investment Holding Group Co., Ltd., Jinan 250102, China

Received:2025-03-10 Revised:2025-04-30 Published:2025-09-15 Online:2025-09-19

摘要/Abstract

摘要： 通过常规三轴压缩试验,研究了泡沫轻质混凝土在不同围压水平下的应力-应变曲线、破坏形态及抗剪强度特性。试验结果表明,泡沫轻质混凝土三轴压缩强度随围压水平的增大而显著提高,但增长速率随围压水平的增大而降低。在围压水平为0.1~0.5时,常规三轴压缩强度相对单轴压缩强度增长1.5~2.5倍,侧向压力对试件破坏形态有显著影响,无围压时试件端部形成三角形受约束区并产生斜裂缝,有围压时主要表现为剪切破坏,且高围压下试件断裂区难以横向膨胀,主裂缝宽度减小,出现挤压塑性流动,产生较大的塑性变形。通过莫尔-库仑准则分析发现,泡沫轻质混凝土的黏聚力和内摩擦角与湿密度呈正相关。

关键词: 泡沫轻质混凝土, 三轴压缩试验, 破坏形态, 湿密度, 围压水平, 抗剪强度特性

Abstract: This study investigated the stress-strain curves, failure modes, and shear strength characteristics of foamed lightweight concrete under different confining pressure levels through conventional triaxial compression tests. The results show that the triaxial compressive strength significantly increases with the increase of confining pressure level, but the growth rate slows down with the increase of confining pressure level. Within the confining pressure level range of 0.1 to 0.5, the conventional triaxial compressive strength increases by 1.5 times to 2.5 times relative to the uniaxial compressive strength. Lateral pressure has a significant impact on the failure mode of the specimens. Without confining pressure, a triangular constrained area is formed at the end of the specimen and diagonal cracks occur. With confining pressure, shear failure is the main manifestation. Under high confining pressure, the fracture area of the specimen is difficult to expand laterally, the main crack width is reduced, and the extrusion plastic flow occurs, resulting in large plastic deformation. Analysis using the Mohr-Coulomb criterion reveals that the cohesion and internal friction angle of foamed lightweight concrete are positively correlated with wet density, and the cohesion is approximately linearly related to porosity. These research findings provide a theoretical basis and technical support for the application of foamed lightweight concrete under complex stress states.

Key words: foamed lightweight concrete, triaxial compression test, failure mode, wet density, confining pressure level, shear strength characteristic

中图分类号:

U414

杨青原, 王垚, 单红日, 李辉, 陈聪, 姜能栋. 泡沫轻质混凝土常规三轴压缩力学性能研究[J]. 硅酸盐通报, 2025, 44(9): 3246-3254.

YANG Qingyuan, WANG Yao, SHAN Hongri, LI Hui, CHEN Cong, JIANG Nengdong. Conventional Triaxial Compressive Mechanical Properties of Foamed Lightweight Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(9): 3246-3254.

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泡沫轻质混凝土常规三轴压缩力学性能研究

Conventional Triaxial Compressive Mechanical Properties of Foamed Lightweight Concrete

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