| 冻融作用下纤维加筋固化盐渍土的抗压性能与微观结构 |
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| 引用本文： | 柴寿喜,张琳,魏丽,田萌萌.冻融作用下纤维加筋固化盐渍土的抗压性能与微观结构[J].水文地质工程地质,2022,49(5):96-105. |
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| 作者姓名： | 柴寿喜 张琳 魏丽 田萌萌 |
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| 作者单位： | 天津城建大学地质与测绘学院, 天津 300384 |
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| 基金项目： | 天津市科技计划项目（20YDTPJC00930）；天津市科技支撑重点项目（19YFZCSF00820） |
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| 摘 要： | 冬季冻结与春季融化引起北方滨海盐渍土的工程性质劣化。为研究纤维加筋对固化土的抗压性能、抗冻融性能与微观结构变化，开展了石灰固化盐渍土和纤维与石灰加筋固化盐渍土的冻融试验、无侧限抗压试验、扫描电镜试验、核磁共振试验和压汞试验，系统分析冻融后纤维加筋固化盐渍土的抗压强度与孔隙特征间的相关性、抗冻融性能及其变化规律。结果表明...
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| 关 键 词： | 冻融 加筋盐渍土 抗压强度 微观结构 核磁共振 |
| 收稿时间： | 2021-12-13 |
Compressive properties and microstructure of saline soil added fiber and lime under freezing-thawing cycles |
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| Institution: | School of Geology and Geomatics, Tianjin Chengjian University, Tianjin 300384, China |
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| Abstract: | Freezing in winter and thawing in spring lead to deterioration of the engineering property in the coastal saline soil in north China. In order to study the effect of the saline soil added lime (lime-soil) and saline soil added fiber and lime (fiber-lime-soil) on compressive capability, anti- freezing-thawing capability and microstructure, the freezing-thawing tests, unconfined compressive test, scanning electronic microscopy (SEM) test, nuclear magnetic resonance (NMR) test and mercury intrusion porosimetry (MIP) test are carried out, and the correlation between the compressive strength and microstructure characteristics, anti-freezing-thawing capability and its variation rules are systematically analyzed. The test results show that the compressive strength, pore volume and porosity of lime-soil and fiber-lime-soil under the freezing-thawing cycles are varied by four stages, that is, stage one (1?3 freezing-thawing cycles), stage two (4?7 freezing-thawing cycles), stage three (8?10 freezing-thawing cycles), stage four (11?15 freezing-thawing cycles). At the same freezing-thawing cycles, the failure strains of lime-soil and fiber-lime-soil increase with the increasing compactness, and the compressive strength and failure strain of fiber-lime-soil are greater than those of lime-soil, but the porosity is lower than that of lime-soil. The more the compactness is, the stronger the friction between fibers and particles, and the better the compressive properties. The interleaved fibers and randomly distributed fibers jointly limit the deformation of the soil and enhance the anti-freezing-thawing properties of the fiber-lime-soil. The results may provide the guidance in theory and technology for engineering utilization in saline soil areas in northern China. |
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