不同网孔形状格栅加筋土界面特性试验研究
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摘要
为探讨土工格栅网孔形状对筋土界面特性的影响,选取网孔尺寸和力学特性相近的三角形网孔土工格栅和矩形网孔土工格栅进行了拉伸试验.基于拉拔阻力、筋土界面抗剪强度、界面表观摩擦系数及格栅肋条变形等参数的变化规律,对不同法向压力及拉拔方向工况下格栅网孔形状对筋土界面特性的影响进行对比分析,结果表明:三角形网孔土工格栅对砂土颗粒侧向位移的限制大于矩形网孔土工格栅;对于三角形网孔土工格栅,工况TX_0和工况TX_90的峰值摩擦角分别为48.2°和38.2°,矩形网孔土工格栅工况SS20的峰值摩擦角仅为35.9°;拉拔过程中,三角形网孔土工格栅的横向肋条和对角线肋条出现了不同程度的挠曲变形,矩形网孔土工格栅的肋条主要为纵肋拉伸变形.
In order to investigate the effect of aperture shape on the geogrid-soil interface behavior,tensile tests were conducted using two kinds of geogrids with triangular apertures and rectangular apertures,which are of similar aperture size and mechanical properties. The effect of aperture shape on the geogrid-soil interface behavior under different normal pressures and pullout test directions were analyzed in terms of the pullout resistance,shear strength of geogrid-soil interface,apparent friction coefficient and geogrid rib deformation. The results show that the geogrid with triangular apertures plays a better role than the geogrid with rectangular apertures in restraining the lateral displacement of soil. For the geogrid with triangular apertures,the peak values of friction angle in cases TX_0 and TX_90 were 48. 2° and 38. 2°,respectively,while the peak value of friction angle in case SS20 case was only 35. 9°. The flexural deformation of different degrees was observed in the horizontal and diagonal ribs of the geogrid with triangular apertures during the pullout test,while the ribs of the geogrid with rectangular apertures mainly presented a tensile deformation.
In order to investigate the effect of aperture shape on the geogrid-soil interface behavior,tensile tests were conducted using two kinds of geogrids with triangular apertures and rectangular apertures,which are of similar aperture size and mechanical properties. The effect of aperture shape on the geogrid-soil interface behavior under different normal pressures and pullout test directions were analyzed in terms of the pullout resistance,shear strength of geogrid-soil interface,apparent friction coefficient and geogrid rib deformation. The results show that the geogrid with triangular apertures plays a better role than the geogrid with rectangular apertures in restraining the lateral displacement of soil. For the geogrid with triangular apertures,the peak values of friction angle in cases TX_0 and TX_90 were 48. 2° and 38. 2°,respectively,while the peak value of friction angle in case SS20 case was only 35. 9°. The flexural deformation of different degrees was observed in the horizontal and diagonal ribs of the geogrid with triangular apertures during the pullout test,while the ribs of the geogrid with rectangular apertures mainly presented a tensile deformation.
引文
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[2]颜祥程,翁兴中,蔻雅楠,等.纤维格栅增强水泥混凝土的弯曲力学特性[J].西南交通大学学报,2012,47(3):394-399.YAN Xiangcheng,WENG Xingzhong,KOU Yanan,et al.Bending mechanical properties of cement concrete with fiber grid reinforcement[J].Journal of Southwest Jiaotong University,2012,47(3):394-399.
[3]苏谦,蔡英.土工格栅、格室加筋砂垫层大模型试验及抗变形能力分析[J].西南交通大学学报,2001,36(2):176-180.SU Qian,CAI Ying.Geogrid-and Geocell-reinforced sand blanket:model test and ability to reduce deformation[J].Journal of Southwest Jiaotong University,2001,36(2):176-180.
[4]刘文白,周健.土工格栅与土界面作用特性试验研究[J].岩土力学,2009,30(4):965-970.LIU Wenbai,ZHOU Jian.Experimental research on interface friction of geogrids and soil[J].Rock and Soil Mechanics,2009,30(4):965-970.
[5]徐林荣,吕大伟,顾绍付,等.筋土界面参数的拉拔试验过程划分研究[J].岩土力学,2004,25(5):709-714.XU Linrong,LDawei,GU Shaofu,et al.Experimental research on pull-out tests processseparation for reinforcement/soil interface parameters selection[J].Rock and Soil Mechanics,2004,25(5):709-714.
[6]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,2006,9(25):1735-1744.BAO Chenggang.Study on interface behavior of geosynthetics and soil[J].Chinese Journal of Rock Mechanics and Engineering,2006,9(25):1735-1744.
[7]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.
[8]史旦达,刘文白,水伟厚,等.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,2013,30(8):2237-2244.SHI Danda,LIU Wenbai,SHUI Weihou,et al.Comparative experimental studies of interface characteristics between uniaxial/biaxial plastic geogrids and different soils[J].Rock and Soil Mechanics,2013,30(8):2237-2244.
[9]EZZEIN F M,BATHOUST R J.A new approach to evaluated soil-geosynthetic interaction using a novel pullout test apparatus and transparent granular soil[J].Geotextiles and Geomembranes,2014,42(2):246-255.
[10]马强,肖衡林,李丽华,等.三向格栅加筋桥头路堤的试验和数值模拟分析[J].岩土工程学报,2013,35(增刊1):287-293.MA Qiang,XIAO Henglin,LI Lihua,et al.Experimental and numerical studies on triaxial geogridreinforced embankment at bridge approach[J].Chinese Journal of Geotechnical Engineering,2013,35(Sup.1):287-293.
[11]苗晨曦,郑俊杰,崔明娟,等.节点突起影响格栅加筋性能的离散元研究[J].岩土力学,2014,35(4):1181-1186.MIAO Chenxi,ZHENG Junjie,CUI Mingjuan,et al.Study of influence of joint protuberance on geogrid reinforcement performance by discrete element method[J].Rock and Soil Mechanics,2014,35(4):1181-1186.
[12]苗晨曦,郑俊杰,崔明娟,等.三向土工格栅筋土界面及摩擦特性的离散元模拟[J].岩土力学,2014,35(增刊1):423-430.MIAO Chenxi,ZHENG Junjie,CUI Mingjuan,et al.Discrete element simulation of interface characteristic and frictional properties of triaxial geogrid[J].Rock and Soil Mechanics,2014,35(Sup.1):423-430.
[13]DONG Y L,HAN J.Behavior of triaxial geogridreinforced bases under static loading[C]∥Geosynthetics for a Challenging World.Proceedings of the 9th International Conference on Geosythetics.Brazil:[s.n.],2010:1547-1550.
[14]DONG Y L,HAN J,BAI X H.Numerical analysis of tensile behaviour of geogrids with rectangular and triangular apertures[J].Geotextiles and Geomembranes,2011,29(7):83-91.
[15]杨广庆,庞巍,吕鹏,等.塑料土工格栅拉伸特性试验研究[J].岩土力学,2008,29(9):2387-2391.YANG Guangqing,PANG Wei,LPeng,et al.Experimental study of tensile properties of geogrids[J].Rock and Soil Mechanics,2008,29(9):2387-2391.