| 考虑含水率对人工冻结红黏土力学特性的影响 |
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| 引用本文： | 王泽成,李栋伟,张潮潮,罗昌泰,卜文杰,贾志文,陈昊.考虑含水率对人工冻结红黏土力学特性的影响[J].地质科技通报,2022,41(6):287-293. |
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| 作者姓名： | 王泽成 李栋伟 张潮潮 罗昌泰 卜文杰 贾志文 陈昊 |
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| 作者单位： | 东华理工大学土木与建筑工程学院, 南昌 330013 |
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| 基金项目： | 国家自然科学基金项目41977236国家自然科学基金项目41672278江西省自然科学基金项目20192ACBL20002新疆兵团科技计划基金项目2020AB003 |
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| 摘 要： | 在冻结法施工中, 冻土的强度及变形特性对冻结壁的稳定性至关重要。为了研究不同含水率对冻结作用下土的强度和蠕变的影响, 以江西红黏土为研究对象, 通过冻结三轴试验, 在-10℃下研究含水率对冻结红黏土强度及蠕变特征的影响。试验结果表明: 16%~32%含水率范围内, 冻结红黏土的抗压强度随含水率的增加先增大后减小; 16%~28%含水率范围内, 随着含水率增大, 其黏聚力逐渐增大, 内摩擦角逐渐减小; 围压为0.2 MPa与0.5 MPa下的蠕变曲线都显示含水率较低时只会出现衰减蠕变阶段和稳定蠕变阶段, 含水率较高时会出现加速蠕变阶段。含水率对红黏土的力学性质影响较大, 研究成果可为江西地区红黏土地层地铁隧道建设人工冻结法施工提供参考。
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| 关 键 词： | 冻结法 红黏土 含水率 三轴试验 力学特性 |
| 收稿时间： | 2021-07-13 |
Effect of water content on the mechanical properties of artificially frozen red clay |
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| Institution: | School of Civil and Architecture Engineering, East China University of Technology, Nanchang 330013, China |
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| Abstract: | In the construction of artificial freezing methods, the strength and deformation characteristics of frozen soil are crucial to the stability of frozen walls. To investigate the effect of different water contents on the strength and creep of the soil under freezing action after specimen preparation, the specimen was kept in an incubator for 24 hours, and the influence of moisture content on the strength and creep characteristics of Jiangxi red clay was studied by freezing triaxial tests at -10℃. The results show that the compressive strength of frozen red clay first increases and then decreases with increasing water content in the range of 16%-32%. In the range of 16%-28% water content, the cohesion increases and the internal friction angle decreases with increasing water content.The creep curves under confining pressures of 0.2 MPa and 0.5 MPa show that the red clay with a low water content only has a decay creep stage and stable creep.The results can be used as a reference for the artificial freezing method in the construction of subway tunnels in the red clay stratum in Jiangxi Province. |
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