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| 干密度对土工格栅与膨胀土界面拉拔性状的影响 | |
| 引用本文： | 汪明元,李齐仁,施戈亮. 干密度对土工格栅与膨胀土界面拉拔性状的影响[J]. 武汉大学学报(工学版), 2010, 43(1) |
| 作者姓名： | 汪明元 李齐仁 施戈亮 |
| 作者单位： | 1. 中国水电顾问集团华东勘测设计研究院,浙江,杭州,310014;长江科学院水利部岩土力学与工程重点实验室,湖北,武汉,430010 2. 中铁西南科学研究院有限公司,四川,成都,610031 3. 长江科学院水利部岩土力学与工程重点实验室,湖北,武汉,430010 |
| 基金项目： | 国家“十一五”科技支撑计划重大项目(编号:2006BAB04A10) |
| 摘 要： | 采用高密度聚乙烯(HDPE)单向土工格栅与聚脂(PET)双向土工格栅,以及南水北调中线工程新乡段的膨胀性泥灰岩风化土,在填土尺寸为600 mm×600 mm×600 mm的大型叠环式剪切仪上进行拉拔试验,研究了干密度对土工格栅与膨胀土界面拉拔性状的影响.结果表明:干密度较大时,土工格栅刚体平动及其速率增大时的拉拔力较大,峰值拉拔力较大,峰值时土工格栅的变形量较大;干密度较大时,筋土界面摩阻力-相对位移曲线更偏于弹塑性特征,其界面切向刚度较小;干密度对界面似摩擦角的影响显著,而对似粘聚力的影响较小. |
| 关 键 词： | 土工格栅 膨胀土 界面性状 干密度 拉拔试验 南水北调工程 |
Effect of dry density on pull-out behaviors of interface between geogrids and compacted expansive soils |
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| WANG Mingyuan,,LI Qiren,SHI Geliang. Effect of dry density on pull-out behaviors of interface between geogrids and compacted expansive soils[J]. Engineering Journal of Wuhan University, 2010, 43(1) | |
| Authors: | WANG Mingyuan LI Qiren SHI Geliang |
| Affiliation: | WANG Mingyuan1,2,LI Qiren3,SHI Geliang2(1.HydroChina Huadong Engineering Corporation,Hangzhou 310014,China,2.Key Lab.of Geotechnical Mechanics , Engineering of Ministry of Water Resources,Yangtze River Scientific Research Institute,Wuhan 430010,3.China Railway Southwest Research Institute Co.,Ltd.,Chengdu 610031,China) |
| Abstract: | A filling with dimension of 600 mm ×600 mm ×600 mm laminated shear test apparatus is adopted to carry out a series of pull-out tests, with HDPE uniaxial geogrid and PET biaxial geogrid, and the weathered expansive marlite in Xinxiang, the middle route of the South-to-North Water Transfer Project (SNWTP) , to investigate effect of dry density on behaviors of the interface between geogrids and compacted expansive soils. The results show that, with higher dry density, the pull-out force increases when the velocity of geogrid's rigid movement increases, and the peak pull-out force and the deformation of geogrid develops greater. Curve of interface friction and relative displacement tends to be elastoplastic behavior with high dry density; and the interface rigidity is smaller. The dry density has a significant effect on the interface quasi-friction angle, but unconspicuous effect on the quasi-cohesion. |
| Keywords: | geogrid expansive soil interface behavior dry density pull-out test South-to-North Water Transfer Project(SNWTP) |
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