干湿-冻融循环下水泥固化淤泥土的力学性能与裂隙发育特征

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (1): 34-40.

所属专题：水泥混凝土

干湿-冻融循环下水泥固化淤泥土的力学性能与裂隙发育特征

陶攀

黄河水利职业技术学院水利工程学院,开封 475004

收稿日期:2020-08-03 修回日期:2020-09-22 出版日期:2021-01-15 发布日期:2021-02-07
作者简介:陶攀(1983—),男,讲师。主要从事岩土工程材料方面的研究。E-mail:cmw9804@163.com
基金资助:
河南省科技指导项目(2019ZD0194);河南省高等教育教学改革研究与实践项目(2019SJGLX736)

Mechanical Properties and Crack Development Characteristics ofCement-Solidified Mud Soil under Dry-Wet-Freeze-Thaw Cycles

TAO Pan

College of Hydraulic Engineering,Yellow River Conservancy Technical Institute,Kaifeng 475004,China

Received:2020-08-03 Revised:2020-09-22 Online:2021-01-15 Published:2021-02-07

摘要/Abstract

摘要： 针对水泥固化淤泥土性能受干湿-冻融循环效应的影响,开展了不同干湿-冻融循环次数下的土体三轴剪切试验、CT扫描试验和SEM扫描试验,研究了干湿-冻融过程中水泥固化淤泥土的力学特征和微结构损伤规律。结果表明:水泥固化淤泥土的应力-应变曲线呈应变硬化特征,内摩擦角与黏聚力指标随干湿-冻融循环次数增加而逐渐减小,且分别表现为指数型和线性衰减趋势;根据二值化的CT扫描图像定量分析了裂隙演化规律,发现试样的裂隙率随干湿-冻融循环次数增加呈指数型增加;由SEM扫描试验可以观测到干湿-冻融循环后试样中的水泥基胶结物流失,颗粒间密实度下降,这是导致水泥固化淤泥土发生裂隙扩展与力学性能弱化的微观机制。

关键词: 水泥固化淤泥土, 干湿-冻融循环, 三轴剪切试验, 力学性能, 裂隙发育特征, 微观形态

Abstract: In order to study the effect of dry-wet-freeze-thaw (short as D-W-F-T) cycle on the properties of cement-solidified mud soil,triaxial shear tests,CT scan tests and SEM scan tests were carried out under different times of D-W-F-T cycle,and the mechanical characteristics and microstructure damage rules of cement-solidified mud soil were studied.The results show that the stress-strain curves of cement-solidified mud soil shows the strain hardening type.The internal friction angle and cohesion index gradually decrease with the increase of the number of D-W-F-T cycles,and the trend of exponential and linear decay are presented,respectively.The cracking evolution rules of the samples are quantitatively analyzed based on the binary CT scan images.It is found that the crack content of the sample increases exponentially with the increase of the number of D-W-F-T cycles.It is also observed by SEM scanning test that the D-W-F-T cycle causes the loss of cement-based materials in the samples and the decrease of compaction between particles,which is the microscopic mechanism that leads to the crack expansion and the mechanical properties weakening of cement-solidified mud soil.

Key words: cement-solidified mud soil, dry-wet-freeze-thaw cycle, triaxial shear test, mechanical property, crack development characteristic, micromorphologic

中图分类号:

TU525

陶攀. 干湿-冻融循环下水泥固化淤泥土的力学性能与裂隙发育特征[J]. 硅酸盐通报, 2021, 40(1): 34-40.

TAO Pan. Mechanical Properties and Crack Development Characteristics ofCement-Solidified Mud Soil under Dry-Wet-Freeze-Thaw Cycles[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(1): 34-40.

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干湿-冻融循环下水泥固化淤泥土的力学性能与裂隙发育特征

Mechanical Properties and Crack Development Characteristics ofCement-Solidified Mud Soil under Dry-Wet-Freeze-Thaw Cycles

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