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岩土力学 2012, 33(1) 53-59 DOI:
ISSN: 1000-7598 CN: 42-1199/O3 |
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| 基础理论与实验研究 |
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带加强肋单向土工格栅的拉拔试验 |
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蔡 春1, 2，张孟喜1，赵岗飞1，李 洁1，吴郦威1 |
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1. 上海大学 土木工程系，上海 200072；2. 大华（集团）有限公司 工程管理中心，上海 200442 |
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摘要：
在水平-垂直加筋体系研究的基础上，对单向土工格栅设置了加强肋，使其具备立体加筋效果。通过大量的拉拔试验，研究了带加强肋土工格栅加筋的筋-土界面特性。通过对汇总得到的36组拉拔试验数据进行分析，探讨了肋间距与肋厚对极限拉拔阻力的影响情况。试验结果表明：在相同法向应力作用下，带加强肋土工格栅的极限拉拔阻力明显高于普通土工格栅，其极限拉拔阻力随着加强肋肋厚的增加而显著增加，并随着加强肋肋距的增加而逐渐减小。在试验基础上，进一步分析了带加强肋土工格栅与砂土的相互作用机制，探讨了极限拉拔阻力的影响因素，建立了拉拔阻力理论公式，并将试验结果与理论值比较，二者基本吻合。 |
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关键词：
立体加筋
带加强肋土工格栅
拉拔试验
极限拉拔阻力
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Pull-out test of uniaxial geogrid with strengthening ribs |
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CAI Chun1, 2，ZHANG Meng-xi1，ZHAO Gang-fei1，LI Jie1，WU Li-wei1
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1. Department of Civil Engineering, Shanghai University, Shanghai 200072, China; 2. Engineering Management Center, Dahua Group Co., Ltd., Shanghai 200442, China
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Abstract:
A new reinforced materials as to strengthen the rib of conventional geogrid is proposed on the basis of horizontal-vertical reinforced soil, which has the effect of three-dimensional reinforcement. A series of pull-out tests of geogrid with strengthening ribs are performed to investigate the interface behavior between sand and strengthening rib geogrid inclusions in terms of different forms of reinforcements. 36 groups of pull-out test data are received by a large number of tests. The impacts of tooth height and tooth spacing of reinforcement on ultimate pull-out resistance are discussed. Test results show that the ultimate pull-out force of strengthening rib geogrid significantly larger than ordinary ones in the same normal stress. Ultimate pull-out resistance increased as the increase of the height of strengthening rib; while it decreased when increased the rib spacing under the same degree of rib height. From the test results, the coefficient of apparent pull-out friction is evaluated. The interaction mechanism between soil and geogrid with strengthening ribs is further analyzed. The influencing factors of ultimate pull-out resistance are discussed; and a new theoretical formula is proposed to determine the pull-out resistance. The comparison between theoretical values and experimental results is in good agreement. |
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Keywords:
three-dimensional reinforcement
geogrid with strengthening ribs
pull-out test
ultimate pull-out resistance
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收稿日期 2010-06-05 修回日期 网络版发布日期 |
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DOI: |
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基金项目:
国家自然科学基金资助项目(No. 40972192)；上海市教育委员会科研创新重点项目(No.11ZZ88) |
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通讯作者: 张孟喜，男，1963年生，博士后，教授，博士生导师，主要从事新型土工加筋技术及环境岩土工程方面的研究工作。E-mail: mxzhang@shu.edu.cn |
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作者简介: 蔡春，男，1984年生，硕士，工程师，主要从事新型土工加筋技术及深基坑工程方面的研究工作 |
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作者Email: caichun2011@sina.com |
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| 参考文献： |
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| 本刊中的类似文章 |
| 1．蔡 春 ，张孟喜 .带加强肋土工格栅的极限拉拔阻力分析[J]. 岩土力学, 2011,32(S2): 340-345 |
| 2．陈建峰，李辉利，柳军修，周 健.1000－7598 (2011)增刊1－0066－06[J]. 岩土力学, 2011,32(S1): 66-71 |
| 3．张达德，张家豪.砂土围压下的废轮胎拉拔试验评估[J]. 岩土力学, 2011,32(3): 733-737 |
| 4．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 |
| 5．李齐仁，汪明元，蔡剑韬，施戈亮.含水率对土工格栅与膨胀土界面拉拔性状的影响[J]. 岩土力学, 2010,31(S2): 175-178 |
| 6．唐朝生，施 斌，高 玮，刘 瑾.纤维加筋土中单根纤维的拉拔试验及临界加筋长度的确定[J]. 岩土力学, 2009,30(8): 2225-2230 |
| 7．史旦达，刘文白，水伟厚，梁永辉.单、双向塑料土工格栅与不同填料界面作用特性对比试验研究[J]. 岩土力学, 2009,30(8): 2237-2244 |
| 8．陈 榕，栾茂田，赵 维，徐晓艳，郝冬雪.土工格栅拉拔试验及筋材摩擦受力特性研究[J]. 岩土力学, 2009,30(4): 960-964 |
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