| 考虑排水条件和粗料含量的砂砾石土动残余变形特性 |
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| 引用本文： | 赵凯,周建军,孙田,刘德洋.考虑排水条件和粗料含量的砂砾石土动残余变形特性[J].岩土力学,2018,39(3):926-932. |
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| 作者姓名： | 赵凯 周建军 孙田 刘德洋 |
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| 作者单位： | 1. 南京工业大学 岩土工程研究所，江苏 南京 210009；2. 中国中铁隧道集团有限公司 盾构及掘进技术国家重点实验室，河南 郑州 450001 |
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| 基金项目： | 国家863计划课题（No.2012AA041802，No.2012AA041803）；国家自然科学基金青年项目（No.51608267）。 |
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| 摘 要： | 采用改进的GDS循环三轴试验系统对5种级配的饱和砂砾土在不排水、单面排水和双面排水条件下进行了动残余变形试验，系统研究粗料含量P5（粒径大于5 mm颗粒质量百分比）和排水条件对饱和砂砾土动残余剪应变和动残余体应变的影响。试验结果表明：动残余剪应变随粗料含量和排水面数的增加而显著降低；循环加载30周产生的不排水动残余剪应变是单面排水条件下动残余剪应变的2～3倍，是双面排水条件下的4～9倍。砂砾土的动残余体应变随粗料含量增大而减小，随着排水面数的增加而增大；双面排水动残余体应变是单面排水动残余体应变的2.0～2.5倍。
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| 关 键 词： | 排水条件 粗料含量 砂砾土 动残余变形 |
| 收稿时间： | 2016-04-11 |
Dynamic residual deformation characteristics of saturated gravel soil considering drainage condition and coarse grain content |
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| ZHAO Kai,ZHOU Jian-jun,SUN Tian,LIU De-yang.Dynamic residual deformation characteristics of saturated gravel soil considering drainage condition and coarse grain content[J].Rock and Soil Mechanics,2018,39(3):926-932. |
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| Authors: | ZHAO Kai ZHOU Jian-jun SUN Tian LIU De-yang |
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| Institution: | 1. Institute of Geotechnical Engineering, Nanjing University of Technology, Nanjing, Jiangsu 210009, China; 2. State Key Laboratory of Shield Machine and Boring Technology, China Railway Tunnel Group Co., Ltd., Zhengzhou, Henan 450001, China |
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| Abstract: | A series of laboratory tests is performed to study the influence of drainage condition and coarse grain content on the dynamic residual deformation characteristics of the saturated gravel soil. Extensive tests are carried out under no-drainage, single-drainage and double-drainage conditions respectively, by using the improved GDS cyclic triaxial testing system. The gravel soil samples consist of five different gradations. The results indicate that, the dynamic residual shear strain is dominated by both the coarse grain content (the content of coarse particles, whose diameters are bigger than 5 mm) and the drainage condition. The residual shear strain significantly decreases as the coarse grain content and the number of drainage surfaces increase. When the number of the cyclic loading reaches 30, the dynamic residual shear strain under the no-drainage condition is 2-3 times that under the single-drainage condition, and 4-9 times that under the double-drainage condition. However, the dynamic residual volumetric strain of the saturated gravel soil decreases with the increase of the coarse grain content, as well as the number of drainage surfaces. The corresponding dynamic residual volumetric strain under the double-drainage condition is 2-2.5 times that under the single-drainage condition. |
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| Keywords: | drainage condition coarse grain content gravel soil dynamic residual deformation |
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