土工合成材料大型直剪界面作用宏细观研究

王家全; 周健; 黄柳云; 黄世斌

土工合成材料大型直剪界面作用宏细观研究 English Version

王家全¹,
周健^{2, 3},
黄柳云¹,
黄世斌¹

1. 广西科技大学土木建筑工程学院，广西柳州 545006; 2. 同济大学地下建筑与工程系，上海 200092; 3. 同济大学岩土及地下工程教育部重点实验室，上海 200092

基金项目: 国家自然科学基金项目（51009030）；广西自然科学基金项目（2011GXNSFB018003）；广西防灾减灾与工程安全实验室开放课题（2012ZDK07）；广西科技大学博士基金项目（院科博1011）

详细信息

作者简介:
王家全(1981- )，男，广西南宁人，博士，副教授，主要从事加筋结构、细观岩土力学、地基基础等方面的教学与研究工作。E-mail: wjquan1999@163.com。

中图分类号: TU43
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出版历程
- 收稿日期: 2012-10-07
- 发布日期: 2013-05-26

Macroscopic and mesoscopic studies of interface interaction on geosynthetics by use of large direct shear tests

1. Department of Civil Engineering, Guangxi University of Science and Technology, Liuzhou 545006, China; 2 Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 3 Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China

摘要

摘要: 利用大型直剪模型试验设备，在不同竖向压力下进行一系列的土工合成材料直剪试验，应用数码可视化跟踪技术，结合土体变形无标点量测技术来研究双向土工格栅与砂土直剪界面作用的宏细观特性，同时分析界面附近土压力分布规律，并研究界面颗粒运动变化规律和细观组构演化特征与宏观特性的关联。分析结果表明，直剪筋土界面附近竖向压力分布从前端依次向后端减少；直剪界面位移达25 mm时，形成了稳定的剪应变集中带；在筋土界面（6～8）D₅₀粒径厚度范围内，界面颗粒以旋转和平动方式同时位移，该范围外颗粒以平动方式沿剪切方向位移，且位移较小；在剪切过程中，界面颗粒发生旋转，土体发生剪胀，孔隙率增大，平均接触数减小，颗粒重新被压密，孔隙率减小，平均接触数增多，颗粒长轴排列趋于水平方向，各细观组构处于相对稳定状态。
- 直剪试验 /
- 接触面 /
- 土工合成材料 /
- 宏细观研究
Abstract: Through a series of direct shear tests under different vertical stresses, digital visual tracking technology and non- punctuation soil deformation measurement techniques are adopted to study the macroscopic and mesoscopic behaviors of the interface between biaxial geogrid and sand. The distribution laws of soil pressure near the reinforcement soil interface are analyzed, and the changes of interface movement and mesoscopic fabric evolution characteristics are studied. The results show that the distribution of the vertical pressures decreases from the front to the back end on the near direct shear reinforcement interface. The direct shear displacement is up to 25 mm, and a stable shear strain concentration zone is formed. In the range of reinforcement interface 6 to 8 times D₅₀ particle size thickness, the sand particle particles on the interface exhibit rotational and translational displacements, and outside this range, the particles show translational displacement along the shearing direction, and the displacement is smaller. During the shearing process, the interface particles rotate, soil dilatancy occurs, the porosity increases, the coordiation number decreases, the particles are re-compacted, the porosity decreases, the coordiation number increases, the particles along the long axis orientation tends to be horizontal direction, and various meso fabrics are in relatively stable state.
- direct shear test /
- interface /
- geosynthetics /
- macroscopic and mesoscopic study

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参考文献(17)

[1]	包承纲). 土工合成材料界面特性的研究和试验验证[J]. 岩石力学与工程学报. 2006, 26(9):1735-1744. (BAO Cheng-gang. Study on interface behavior of geosynthetics and soil[J]. Chinese Journal of Rock Mechanics and Engineering, 2006, 26(9): 1735-1744.( (in Chinese))
[2]	徐超,(赵春风),(叶观宝). 关于土与土工合成材料界面的试验研究[J]. (同济大学学报), 2004,32(3):307-311. (XU Chao, ZHAO Chun-feng, YE Guan-bao. Research on interface between soil and geosynthetics[J]. Journal of Tongji University, 2004, 32 (3): 307-311.( (in Chinese))
[3]	张孟喜),(张石磊),黄瑾. 低超载下条带式带齿加筋界面特性[J]. (岩土工程学报), 2007,29(11):1623-1629. (ZHANG Meng-xi, ZHANG Shi-lei, HUANG Jin. Behavior of interface between denti-strip geosynthetic reinforcements and soil under low surcharge[J]. Chinese Journal of Geotechnical Engineering,2007,29(11): 1623-1629. (in Chinese)
[4]	闫澍旺), BARR B. 土工格栅与土相互作用的有限元分析[J]. (岩土工程学报), 1997,19(6):56-61. (YAN Shu-wang, BEN Barr. Finite-element modelling of soil-geogrid interaction with application to interpret the pullout behaviour of geogrids[J]. Chinese Journal of Geotechnical Engineering,1997,19(6): 56-61. (in Chinese)
[5]	MORACI N, GIOFFRE D. A simple method to evaluate the pullout resistance of extruded geogrids embedded in a compacted granular soil[J]. Geotextiles and Geomembranes, 2006,24(2):116-128.
[6]	TAFRESHI S N M, DAWSON A R. Comparison of bearing capacity of a strip footing on sand with geocell and with planar forms of geotextile reinforcement[J]. Geotextiles and Geomembranes, 2010,28(1):72-84.
[7]	吴景海),(王德群),陈环. 土工合成材料加筋砂土三轴试验研究[J]. (岩土工程学报), 2000,22(2):199-204. (WU Jing-hai, WANG De-qun, CHEN Huan. Study on geosynthetic reinforced sand by triaxial compression test[J]. Chinese Journal of Geotechnical Engineering,2000,22(2): 199-204. (in Chinese)
[8]	DIETZ M S, LINGS M L. Postpeak strength of interfaces in a stress-dilatancy framework[J]. Journal of Geotechnical and Geoenvironmental, 2006,132(11):1474-1484.
[9]	DOVE J E, JARRETT J B. Behavior of dilative sand interfaces in a geotribology framework[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2002,128(1):25-37.
[10]	王吉力),(马时冬). 土与土工织物接触界面间摩擦特性的试验研究[J]. (岩土力学), 1992,13(4):35-44. (WANG Ji-li, MA Shi-dong. Experimental study of friction features for interface of soils and geotextiles[J]. Rock and Soil Mechanics. 1992, 13(4):35-44. (in Chinese))
[11]	吴景海),陈环,(王玲娟),等. 土工合成材料与土界面作用特性的研究[J]. (岩土工程学报), 2001,23(1):89-93. (WU Jing-hai, CHEN Huan, WANG Ling-juan, et al. Study on soil interaction characteristics of geosynthetics[J]. Chinese Journal of Geotechnical Engineering,2001,23(1): 89-93. (in Chinese)
[12]	刘炜,(汪益敏),(陈页开),等. 土工格室加筋土的大尺寸直剪试验研究[J]. (岩土力学), 2008,29(11):3133-3138. (LIU Wei, WANG Yi-min, CHEN Ye-kai, et al. Research on large size direct shear test for geocell reinforced soil[J]. Rock and Soil Mechanics,2008,29(11): 3133-3138. (in Chinese)
[13]	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.
[14]	尹光志),(张东明),(魏作安),等. 土工合成材料与细粒尾矿界面作用特性的试验研究[J]. (岩石力学与工程学报), 2004,23(3):426-429. (YIN Guang-zhi, ZHANG Dong-ming, WEI Zuo-an, et al. Testing study on interaction characteristics between fine grained tailings and geosynthetics[J]. Chinese Journal of Rock Mechanics and Engineering.2004,23(3): 426-429. (in Chinese)
[15]	ZHANG G, LIANG D F, ZHANG J M. Image analysis measurement of soil particle movement during a soil-structure interface test[J]. Computers and Geotechnics, 2006,33(4/5):248-259.
[16]	张嘎,(张建民),(梁东方). 土与结构接触面试验中的土颗粒细观运动测量[J]. (岩土工程学报), 2005,27(8):903-907. (ZHANG Ga, ZHANG Jian-min, LIANG Dong-fang. Measurement of soil particle movement in soil-structure interface test[J]. Chinese Journal of Geotechnical Engineering, 2005, 27(8): 903-907.( (in Chinese))
[17]	周健,(余荣传),(贾敏才). 基于数字图像技术的砂土模型试验细观结构参数测量[J]. (岩土工程学报), 2006,28(12):2047-2052. (ZHOU Jian, YU Rong-chuan, JIA Min-cai. Measurement of microstructure parameters for granular soil model using digital image technology[J]. Chinese Journal of Geotechnical Engineering, 2006, 28(12): 2047-2052.( (in Chinese))