| 土工格栅与砂土相互作用机制的拉拔试验研究 |
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| 引用本文： | 徐超,廖星樾.土工格栅与砂土相互作用机制的拉拔试验研究[J].岩土力学,2011,32(2):423-428. |
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| 作者姓名： | 徐超 廖星樾 |
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| 作者单位： | 1. 同济大学,岩土及地下工程教育部重点实验室,上海,200092
2. 四川省泸州县县委组织部,四川,泸州县,646100 |
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| 基金项目： | 国家自然科学基金，上海市重点学科建设项目 |
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| 摘 要： | 筋土之间的相互作用机制复杂,是土工合成材料加筋加固应用中的核心问题。通过室内拉拔试验,研究了土工格栅与砂土相互作用机制和格栅几何特征对拉拔阻力的影响。初步揭示了格栅横肋和纵肋在拉拔模式下的作用机制和格栅网格刚度对拉拔阻力的影响。结果表明,在拉拔位移较小时,纵肋摩阻力和横肋被动阻力几乎同步增长;在拉拔位移较大时,纵肋摩阻力逐步达到峰值,拉拔力的增量大部分来源于被动阻力的进一步增长。土工格栅拉伸模量和网格刚度是影响筋土界面力学特性的重要因素。
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| 关 键 词： | 拉拔试验 筋土相互作用 土工格栅 被动阻力 界面摩阻力 |
| 收稿时间： | 2009-06-02 |
Researches on interacton mechanism between geogrid and sand by pull-out tests |
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| XU Chao,LIAO Xing-yue.Researches on interacton mechanism between geogrid and sand by pull-out tests[J].Rock and Soil Mechanics,2011,32(2):423-428. |
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| Authors: | XU Chao LIAO Xing-yue |
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| Institution: | 1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 2. Organization Department of Luzhou County Committee of CPC, Luzhou, Sichuan 646100, China |
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| Abstract: | The complicated mechanism of interaction between soils and reinforcement is the key problem in the application of geosynthetic reinforced soil engineering. Through laboratory pull-out tests, the mechanism of interaction between sand and geogrid and the factors of grid metric features influencing the pull-out resistance have been explored. This research work tentatively reveals the action mechanism of transverse ribs and longitude ribs and the influence of grid rigidity on the pull-out resistance. The results indicate that the interface friction of longitude ribs and the passive resistance of transverse ribs develop basically simultaneously when the pull-out displacement is small; while the displacement becomes larger, the longitude ribs’ fricton reaches gradually the peak value, the increaseing of pull-out resistance is mostly attributed to the development of transverse ribs’ resistance. The tensile modulus and the structure stiffness of geogrids are the important factors affecting the mechanical charateristics of interface between soils and reinforcement. |
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| Keywords: | pull-out tests interaction between soils and reinforcement geogrid passive resistance interface friction |
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