| 冻结黏土空心圆柱试样制样方法 |
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| 引用本文： | 雷乐乐,王大雁,王永涛,张斌龙.冻结黏土空心圆柱试样制样方法[J].冰川冻土,2022,44(5):1674-1680. |
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| 作者姓名： | 雷乐乐 王大雁 王永涛 张斌龙 |
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| 作者单位： | 1.东华理工大学 土木与建筑工程学院，江西 南昌 330013;2.中国科学院 西北生态环境资源研究院 冻土工程国家重点实验室，甘肃 兰州 730000;3.内蒙古大学 交通学院，内蒙古 呼和浩特 010070 |
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| 基金项目： | 东华理工大学博士启动基金项目(DHBK2019242);国家自然科学基金项目(41871054);冻土工程国家重点实验室项目(SKLFSE-ZT-31) |
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| 摘 要： | 冻土空心圆柱仪是室内研究冻土在车辆荷载等复杂应力路径下力学特性的主要仪器，试验中为实现主应力轴方向在垂直于径向平面内连续旋转，其试样多采用薄壁空心圆柱试样，但由于空心圆柱试样薄壁的特点，增加了制样的困难，成为制约冻土空心圆柱试验研究进展的主要阻碍。为此，借鉴冻土三轴试验的制样方法，基于实验室现有的制样条件，设计了一套重塑冻结黏土空心圆柱试样的制样装置，可提高制样效率，减小制样过程中人为因素的影响；随后，基于该制样装置，提出了一种冻结黏土空心圆柱试样的制样方法，给出了制备重塑冻结黏土的制样步骤。最后，通过对所制备试样的物理力学性质测定，发现采用该制样方法可以制备含水率及干密度均匀、力学性质稳定的重塑冻结黏土试样；同时对两个平行制备的冻结黏土试样的不同主应力轴方向的定向剪切试验结果进行了比较，证明了所提出的制样方法具有良好的可重复性，且所得的冻土力学特性与已有研究成果吻合较好，可用于进一步系统研究复杂条件下冻结黏土的静、动力学特性。
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| 关 键 词： | 冻土 空心圆柱试样 制样方法 力学特性 |
| 收稿时间： | 2021-08-11 |
| 修稿时间： | 2022-05-25 |
Study on preparation method of remolded hollow cylinder specimen of frozen soil |
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| Lele LEI,Dayan WANG,Yongtao WANG,Binlong ZHANG.Study on preparation method of remolded hollow cylinder specimen of frozen soil[J].Journal of Glaciology and Geocryology,2022,44(5):1674-1680. |
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| Authors: | Lele LEI Dayan WANG Yongtao WANG Binlong ZHANG |
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| Institution: | 1.East China University of Technology，Nanchang 330013，China;2.State Key Laboratory of Frozen Soil Engineering，Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China;3.Institute of Transportation，Inner Mongolia University，Hohhot 010070，China |
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| Abstract: | The frozen soil hollow cylinder apparatus is the main experiment instrument to study the mechanical characteristics of frozen soil under the complex stress paths including stress rotation. The sample used in frozen soil hollow cylinder test is mostly hollow cylinder sample to achieve the continuous rotation of the main stress axis direction. However， it is difficult to prepare hollow cylinder specimen because of the thin wall， which can have a great influence on the further study in frozen soil hollow cylindrical tests. Therefore， based on the preparation method of clay sample in triaxial test， a novel preparation device for remolded hollow cylinder specimen of frozen soil is designed， which can improve the efficiency of sample making and reduce the influence of human factors in the sample making process. Based on the novel preparation device， a practical preparation method for frozen clay hollow cylindrical specimens is proposed. It is found the moisture content and dry density of the clay samples prepared by this method is uniform and the mechanical properties are stable， which can meet the requirements of indoor mechanical tests of frozen soil. Two parallel remodeled hollow cylinder soil samples of frozen clay prepared under the same conditions are tested in the different principal stress directions tests， and the consistency of the results indicates that the preparation method for samples has sound repeatability. Thus， the proposed preparation method can be used for further systematical researches on the static and dynamic mechanical behaviors of frozen soil under complex condition. |
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| Keywords: | frozen clay hollow cylinder specimen preparation method mechanical characteristic |
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