三向土工格栅变形及筋土界面特性试验研究

曹文昭; 郑俊杰; 周燕君; 吴文彪; 江金国

doi:10.3969/j.issn.0258-2724.2016.05.004

三向土工格栅变形及筋土界面特性试验研究

doi: 10.3969/j.issn.0258-2724.2016.05.004

基金项目:

国家自然科学基金资助项目（51278216，51478201）

详细信息

作者简介:
曹文昭(1990-),男,博士,研究方向为地基处理,电话:027-87557024,E-mail:cwz_1990@hust.edu.cn

通讯作者:
郑俊杰(1967-),男,教授,博士,研究方向为岩土工程与隧道工程,电话:027-87557024,E-mail:zhengjj@hust.edu.cn

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出版历程
- 收稿日期: 2015-07-13
- 刊出日期: 2016-10-25

Experimental Investigation of Deformation and Geogrid-Soil Interface Behavior of Triaxial Geogrid

摘要

摘要: 为探讨三向土工格栅的筋土界面特性，以三向土工格栅为研究对象，考虑0和90两种拉拔方向（分别记为TX_0工况和TX_90工况）的影响，开展了一系列室内拉拔试验。通过对格栅试样沿拉拔方向4个断面的位移进行监测，研究了三向土工格栅的拉拔力-拉拔位移关系、分段变形特性、三向土工格栅的筋土界面剪胀（缩）特性、平均摩阻力-相对位移特征以及拉拔方向对筋土界面强度参数的影响。研究结果表明：填砂压实度对三向土工格栅拉拔力和筋土界面剪胀（缩）特性的影响显著；法向应力越高，筋土界面剪缩性越大，而剪胀性越小，达到最大剪缩（胀）量所需的剪切位移也越大；筋土界面摩阻力的发挥是一个渐进的过程，呈弹塑性-软化特征；法向应力高于20kPa时，TX_0工况的筋土界面强度较TX_90工况更高。
- 三向土工格栅 /
- 拉拔试验 /
- 拉拔方向 /
- 格栅变形 /
- 筋土界面特性
Abstract: In order to investigate the behavior of geogrid-soil interface of traxial geogrid, a series of laboratory pullout tests focusing on triaxial geogrid were conducted considering the effect of two kinds of pullout directions, referred to as TX_0 case and TX_90 case, respectively. The geogrid displacements were measured at four sections along the geogrid specimens. Based on the measurements, the relation between pullout force and pullout displacement and the deformation of each geogrid segment were studied. Furthermore, the dilatancy/shrinkage behavior, the relation between the average friction and relative displacement, and the effect of pullout directions on the interface strength were also analyzed. The experimental results demonstrate that the degree of compaction has a great influence on the pullout force and shear dilatancy/shrinkage behavior of the geogrid-soil interface. As the normal stress increases, the shear shrinkage increases while the shear dilatancy decreases. The shear displacements corresponding to the maximum shear dilatancy/shrinkage also increase with the increase of normal stress. The interface friction develops in a progressive mode and an elasto-plastic softening characteristic is observed of the interface behavior. The geogrid-soil interface strength of the TX_0 case is higher than that of the TX_90 case when the normal stress is higher than 20 kPa.
- triaxial geogrid /
- pullout test /
- pullout direction /
- geogrid deformation /
- behavior of geogrid-soil interface

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参考文献(16)

WANG Z, RICHWIEN W. A study of soil-reinforcement interface friction[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2002, 128(1): 92-94.

杨广庆,李广信,张保俭. 土工格栅界面摩擦特性试验研究[J]. 岩土工程学报,2006,28(8): 948-952. YANG Guangqing, LI Guangxin, ZHANG Baojian. Experimental studies on interface friction characteristics of geogrids[J]. Chinese Journal of Geotechnical Engineering, 2006, 28(8): 948-952.

CHEN C, MCDOWELL G R, THOM N H. Discrete element modeling of cyclic loads of geogrid-reinforced ballast under confined and unconfined conditions[J]. Geotextiles and Geomembranes, 2012, 35: 76-86.

CHEN C, MCDOWELL G R, THOM N H. A study of geogrid-reinforced ballast using laboratory pull-out tests and discrete element modeling[J]. Geomechanics and Geoengineering: an International Journal, 2013, 8(4): 244-253.

DONG Y L, HAN J, BAI X H. Numerical analysis of tensile behavior of geogrid with rectangular and triangular apertures[J]. Geotextiles and Geomembranes, 2011, 29(2): 83-91.

QIAN Y, HAN J, POKHAREL S K, et al. Performance of triangular aperture geogrid-reinforced base courses over weak subgrade under cyclic loading[J]. Journal of Materials in Civil Engineering, 2013, 25(8): 1013-1021.

陈榕,栾茂田,赵维,等. 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. CHEN Rong, LUAN Maotian, ZHAO Wei, et al. Research on pull-out test and frictional resistance characteristic of geogrids[J]. Rock and Soil Mechanics, 2009, 30(4): 960-964.

包承纲. 土工合成材料应用原理与工程实践[M]. 北京:中国水利水电出版社,2008: 142-146.

MORACI N, RECALCATI P. Factors affecting the pullout behaviour of extruded geogrids embedded in a compacted granular soil[J]. Geotextiles and Geomembranes, 2006, 24(4): 220-242.

PALMEIRA E M. Bearing force mobilisation in pull-out tests on geogrids[J]. Geotextiles and Geomembranes, 2004, 22(6): 481-509.

EZZEIN F M, BATHURST R J. A new approach to evaluate soil-geosynthetic interaction using a novel pullout test apparatus and transparent granular soil[J]. Geotextiles and Geomembranes, 2014, 42(2): 246-255.

BATHURST R J, EZZEIN F M. Geogrid and soil displacement observations during pullout using a transparent granular soil[J]. Geotechnical Testing Journal, 2015, 38(5): 673-685.

中华人民共和国水利部. SL 235-2012 土工合成材料试验规程[S]. 北京:中国水利水电出版社,2012.

汪明元,龚晓南,包承纲,等. 土工格栅与压实膨胀土界面的拉拔性状[J]. 工程力学,2009,26(11): 145-151. WANG Mingyuan, GONG Xiaonan, BAO Chenggang, et al. Pull-out behavior of the interface between geogrid and compacted expansive soil[J]. Engineering Mechanics, 2009, 26(11): 145-151.

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. XU Chao, LIAO Xingyue. Researches on interaction mechanism between geogrid and sand by pull-out tests[J]. Rock and Soil Mechanics, 2011, 32(2): 423-428.

刘飞禹,林旭,王军. 砂土颗粒级配对筋土界面抗剪特性的影响[J]. 岩石力学与工程学报,2013,32(12): 2575-2582. LIU Feiyu, LIN Xu, WANG Jun. Influence of particle-size gradation on shear behavior of geosynthetics and sand interface[J]. Chinese Journal of Rock Mechanics and Engineering, 2013, 32(12): 2575-2582.

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