加筋土筋土界面抗剪强度影响因素试验研究
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摘要
通过室内筋土界面直剪试验,考虑筋土界面抗剪强度的影响因素,进行了不同剪切速度、筋材空隙率及土体含水率下筋土界面直剪试验,分析了不同因素对筋土界面抗剪强度的影响。试验结果表明,剪切速度主要影响筋土界面的内摩擦角,对筋土界面黏聚力几乎没有影响,随着剪切速度的增加,内摩擦角变大,导致筋土界面抗剪强度增大。筋材空隙率主要影响筋土界面黏聚力大小,空隙率越大,筋材肋条对土颗粒的约束作用越小,筋土界面抗剪强度降低。筋土界面抗剪强度受土体含水率的影响较大,随着土体含水率的增加,筋土界面黏聚力和内摩擦角都明显减小,导致筋土界面抗剪强度显著降低。
The direct shear tests between reinforcement material and soil interface are conducted considering different shear speeds,different void ratios of reinforcement material and different moisture contents of soil. And the influences of different factors to shear strength are analyzed. The test results show that shear speeds affected the friction angle mainly but had little effect on the cohesion. The friction angle got bigger with the shear speeds increased which resulted an increasing of shear strength. On the other hand,the cohesion was influenced by different void ratios of reinforcement material mainly. With the reinforcement material void ratios increased,the constraint effects of the ribs to soil reduced and the shear strength got smaller. The shear strength is influenced strongly by soil moisture content. It is shown that with the increases of soil moisture content,the cohesion and friction angle both reduced significantly which resulting a reduction of shear strength.
The direct shear tests between reinforcement material and soil interface are conducted considering different shear speeds,different void ratios of reinforcement material and different moisture contents of soil. And the influences of different factors to shear strength are analyzed. The test results show that shear speeds affected the friction angle mainly but had little effect on the cohesion. The friction angle got bigger with the shear speeds increased which resulted an increasing of shear strength. On the other hand,the cohesion was influenced by different void ratios of reinforcement material mainly. With the reinforcement material void ratios increased,the constraint effects of the ribs to soil reduced and the shear strength got smaller. The shear strength is influenced strongly by soil moisture content. It is shown that with the increases of soil moisture content,the cohesion and friction angle both reduced significantly which resulting a reduction of shear strength.
引文
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[15]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,2009,30(8):2237-2244.(Shi Danda,Liu Wenbai,Shui Weihou,et al.Comparative experimental studies of interface characteristics between uniaxial/biaxial plastic reinforcement material and different soils[J].Rock and Soil Mechanics,2009,30(8):2237-2244.(in Chinese))
[16]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 Guangzhi,Zhang Dongming,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))
[17]Anubhav,Basudhar P K.Modeling of soil-woven geotextile interface behavior from direct shear test results[J].Geotextiles and Geomembranes,2010,28(4):403-408.
[2]中华人民共和国水利部.土工试验规程(SL237-1999)[S].1999.(Ministry of Water Resources of the People’s Republic of China.Soil test procedures(SL237-1999)[S].Beijing:China Water Conservancy and Hydropower Press,1999.(in Chinese))
[3]中华人民共和国交通部.公路工程土工合成材料试验规范(JTG E50-2006)[S].北京:人民交通出版社,2006.(Ministry of Transport of the People’s Republic of China.Test methods of geosynthetics for highway engineering(JTG E50-2006)[S].Beijing:China Communications Press,2006.(in Chinese))
[4]]孙红,姜开锋,吴雪萍,等.软弱土路堤的玻璃纤维加筋土加固技术[J].地下空间与工程学报,2014,10(增2):1893-1898.(Sun Hong,Jiang Kaifeng,Wu Xueping,et al.Glass fiber-reinforced soil technology for soft soil embankment[J].Chinese Journal of Underground Space and Engineering,2014,10(Supp.2):1893-1898.(in Chinese))
[5]Krieger J,Thamm B R.Studies of failure mechanism and design method for geotextile reinforced soil walls[J].Geotextiles and Geomembranes,1991,10(1):53-63.
[6]Liu C N,Zornberg J G,Asce M,et al.Behavior of geogrid-sand interface in direct shear mode[J].Journal of Geotechnical and Geoenvironmental Engineering,2009,135(12):1863-1871.
[7]Anubhav P,basudhar K.Modeling of soil-woven geotextile interface behavior from direct shear test results[J].Geotextiles and Geomembranes,2010,28(4):403-408.
[8]Esterhuizen J J B,Fliz G M,Duncan J M.Constitutive behavior of geosynthetic interface[J].Journal of Geotechnical and Geoenvironmental Engineering,2001,127(10):834-840.
[9]张文慧,王保田,张福海,等.双向土工格栅与黏土界面作用特性试验研究[J].岩土力学,2007,28(5):1031-1034.(Zhang Wenhui,Wang Baotian,Zhang Fuhai,et al.Test study on interaction characteristics between two-way geogrids and clay[J].Rock and Soil Mechanics,2007,28(5):1031-1034.(in Chinese))
[10]蔡剑韬.土工格栅加筋膨胀土拉拔试验研究[J].岩土力学,2015,36(1):204-208.(Cai Jiantao.Pull-out test on interface behavior between expansive soils and geogrids[J].Rock and Soil Mechanics,2015,36(1):204-208.(in Chinese))
[11]周健,王家全,孔祥利,等.砂土颗粒与土工合成材料接触界面细观研究[J].岩土工程学报,2010,32(1):61-67.(Zhou Jian,Wang Jiaquan,Kong Xiangli,et al.Mesoscopic study of the interface between sandy soil and geosynthetics[J].Chinese Journal of Geotechnical Engineering,2010,32(1):61-67.(in Chinese))
[12]陈建峰,李辉利,柳军修,等.土工格栅与砂土的细观界面特性研究[J].岩土力学,2011,32(增1):66-71.(Chen Jianfeng,Li Huili,Liu Junxiu,et al.Mesoscopic study of interface properties of geogridreinforced soil[J].Rock and Soil Mechanics,2011,32(Supp.1):66-71.(in Chinese))
[13]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,2006,25(9):1735-1744.(Bao Chenggang.Study on interface behavior of geosynthetics and soil[J].Chinese Journal of Rock Mechanics and Engineering,2006,2(5):1735-1744.(in Chinese))
[14]]张小莉,张永兴.基于有限元法的加筋路堤影响因素分析[J].地下空间与工程学报,2006,2(5):731-733.(Zhang Xiaoli,Zhang Yongxing.Finite element analysis of reinforced embankment simulated by ANSYS software[J].Chinese Journal of Underground Space and Engineering,2006,2(5):731-733.(in Chinese))
[15]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,2009,30(8):2237-2244.(Shi Danda,Liu Wenbai,Shui Weihou,et al.Comparative experimental studies of interface characteristics between uniaxial/biaxial plastic reinforcement material and different soils[J].Rock and Soil Mechanics,2009,30(8):2237-2244.(in Chinese))
[16]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 Guangzhi,Zhang Dongming,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))
[17]Anubhav,Basudhar P K.Modeling of soil-woven geotextile interface behavior from direct shear test results[J].Geotextiles and Geomembranes,2010,28(4):403-408.