| 干湿循环下重塑砂质粉黏土强度及变形特性研究 |
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| 引用本文： | 王乐,钱叶琳,王洁,吕卫柯,高海云.干湿循环下重塑砂质粉黏土强度及变形特性研究[J].路基工程,2016,0(5):78-82. |
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| 作者姓名： | 王乐 钱叶琳 王洁 吕卫柯 高海云 |
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| 作者单位： | 1.安徽省公路工程检测中心, 合肥 230051 |
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| 基金项目： | 国家自然科学基金（51304057）；安徽省住房城乡建设科学技术计划项目（2013YF-27）；中央高校基本科研业务费资助项目（2012HGQC0023）；合肥市重点工程建设局科技项目（2013CGAZ0771） |
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| 摘 要： | 砂质粉黏土是一种广泛存在于富水区域的土，容易受到地下水位的升降和季节变换的影响。为得到满足工程需要的设计参数，了解合肥南淝河附近轨道交通东门换乘站工程的砂质粉黏土在干湿循环下的强度变形特征，基于室内直剪试验，获得了砂质粉黏土经历干湿循环后的抗剪强度指标及其变形情况。试验结果表明:重塑砂质粉黏土在经历干湿循环后，抗剪强度先增大后减小，发生了衰减，最终趋于稳定，且稳定值小于初始值；剪切破坏滑动面由较为完整变为有明显的裂缝而丧失完整性。从机制上分析了剪切强度变化的原因，认为重塑土的损伤变量在干湿循环时开始了演化，导致土体发生强度衰减。
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| 关 键 词： | 重塑黏土 直剪试验 干湿循环 抗剪强度 变形特征 |
| 收稿时间： | 2019-11-10 |
Study on Strength and Deformation Characteristics of Remoulded Sandy Silt Clay under Dry-wet Cycle |
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| Abstract: | Sandy silt clay exists widely in water-rich areas, and is susceptible to the level of underground water and change of seasons. To get the design parameters as required by the engineering, and understand the strength and deformation characteristics of the sandy silt clay at Dongmen Transfer Station of rail transit project near Nanfei River, Hefei, under dry-wet cycle, the paper based on indoor direct shear test found out the shear strength and deformations of the sandy silt clay after dry-wet cycle. The test result shows that remoulded sandy silt clay after dry-wet cycle has its shear strength increase first then decrease, occuring declined, and finally tend to stable value which is less than the intial value thereof; the relatively intact sliding surface of shear failure loses its integrity and has significant cracks. The reason why the shear strength changes was so analyzed from the mechanism that the the damage variable of remolded clay starts to evolve in the dry-wet cycle, leading to weakening of the clay’s shear strength. |
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