黄土泥岩接触地带边坡的土工织物防护模型试验
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摘要
以内蒙古黄土泥岩接触地带的路基边坡为研究对象,设计黄土泥岩接触地带的路基边坡模型试验,运用Mirafi-H2Ri新型土工织物疏导下渗雨水,阻止雨水下渗路基并集聚于接触面而引起界面滑移,对黄土泥岩接触地带路基边坡的工程防护进行试验研究。通过在坡体内埋置孔隙水压力传感器,采集黄土层中孔隙水压力值,并测定黄土层中各测点的含水率,研究黄土泥岩路基边坡坡面铺设Mirafi-H2Ri土工织物前后坡体稳定性的变化。结果表明:在降雨条件下,Mirafi-H2Ri土工织物可以将黄土层沿坡面下渗的雨水利用自身的导流通道进行疏导,使得黄土泥岩接触面的孔隙水压力及含水率值较未铺设土工织物时明显降低;沿路基边坡铺设Mirafi-H2Ri土工织物能有效地降低或延缓黄土泥岩界面滑移的出现。
Slope stability of loess mudstone contacted zones in Inner Mongolia is regarded as the study object,and subgrade slope model experiment of loess mudstone contacted zones is designed.Some engineering protection measures are considered,and the Mirafi-H2Ri geotextile is selected due to its hydrophobic property.It is adept in transporting the storm water which infiltrates from the surface of loess layer out of the slope.The interfacial slip between loess layer and mudstone is prevented.The measuring results of pore water pressure are collected in loess layer by pore water pressure sensor which is embeded in the slope body,and the moisture content of loess layer at some position are tested.The slope stability is evaluated through using the Mirafi-H2Ri geotextile before and after.The results show that Mirafi-H2Ri geotextile can transfer the storm water out of the slope through its own diversion channels,and the pore water pressure and moisture content are decreased along the interface significantly.The Mirafi-H2Ri geotextile can be used in slope surface to delay or avoid emergence of interfacial in loess mudstone contacted zones.
Slope stability of loess mudstone contacted zones in Inner Mongolia is regarded as the study object,and subgrade slope model experiment of loess mudstone contacted zones is designed.Some engineering protection measures are considered,and the Mirafi-H2Ri geotextile is selected due to its hydrophobic property.It is adept in transporting the storm water which infiltrates from the surface of loess layer out of the slope.The interfacial slip between loess layer and mudstone is prevented.The measuring results of pore water pressure are collected in loess layer by pore water pressure sensor which is embeded in the slope body,and the moisture content of loess layer at some position are tested.The slope stability is evaluated through using the Mirafi-H2Ri geotextile before and after.The results show that Mirafi-H2Ri geotextile can transfer the storm water out of the slope through its own diversion channels,and the pore water pressure and moisture content are decreased along the interface significantly.The Mirafi-H2Ri geotextile can be used in slope surface to delay or avoid emergence of interfacial in loess mudstone contacted zones.
引文
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[2]石崇喜,黄英,甄祯,等.滑坡模型试验研究现状[J].云南水利水电,2011,27(5):7-10.Shi Ch X,Huang Y,Zhen Zh,et al.State-of-art of research on landslide model experiment[J].Yunnan Water Power,2011,27(5):7-10.(in Chinese)
[3]宋彧,张贵文,党星海,等.相似模型与缩尺模型特点分析[J].高等建筑教育,2003,12(4):57-58.Song Y,Zhang G W,Dang X H,et al.Specialties analysis of similar model and reduced-scale model[J].Journal of Architectural Education in Institutions of Higher Learning,2003,12(4):57-58.(in Chinese)
[4]顾大钊.相似材料和相似模型[M].北京:中国矿业大学出版社,1995.Gu D Zh.Similar material and similar model[M].Beijing:China University of Mining Technology,1995.(in Chinese)
[5]宋克强,孙超图,袁继国,等.黄土滑坡的模型试验研究[J].水土保持学报,1991,5(2):14-21.Song K Q,Sun Ch T,Yuan J G,et al.The study of loess slide by model test[J].Acta Conservationis Soil Et Aquae Sinica,1991,5(2):14-21.(in Chinese)
[6]胡明鉴,汪稔,张平仓.斜坡稳定性及降雨条件下激发滑坡的试验研究[J].岩土工程学报,2001,23(4):454-457.Hu M J,Wang R,Zhang P C.Primary research on the effect of rainfall on landslide[J].Chinese Journal of Geotechnical Engineering,2001,23(4):454-457.(in Chinese)
[7]钱纪芸,张嘎,张建民,等.降雨时黏性土边坡的离心模型试验[J].清华大学学报(自然科学版),2009,49(6):829-833.Qian J Y,Zhang G,Zhang J M,et al.Centrifuge model tests of cohesive soil slopes during rainfall[J].J Tsinghua Univ(Sci&Tech),2009,49(6):829-833.(in Chinese)
[8]Timpong S,Itoh K,Toyosawa Y.Geotechnical centrifuge modeling of slope failure induced by ground water table change[C]∥International Conference on Landslides and Climate Change-Challenges and Solutions.London:Taylor&Francis Group,2007:107-112.
[9]Kawamura S,Miura S,Yokohama S.Rainfall-induced failure of volcanic slope with crushable particles subjected to freeze-thaw action[C]∥Proceedings of American Society Civil Engineers.Dallas:Geo-Frontiers Congress,2011:624-628.
[10]王微.公路土工合成材料防排水性能研究[D].哈尔滨:东北林业大学,2004.Wang W.Research on waterproof and drainage properties of road geosynthetics[D].Harbin:Northeast Forestry University,2004.(in Chinese)
[11]汪锦锦.土工布非饱和导水特性研究[D].兰州:兰州大学,2014.Wang J J.Unsaturated hydraulic conductivity characteristics of geotextiles[D].Lanzhou:Lanzhou University,2014.(in Chinese)
[12]Stormont J C,Henry K S,Evans T M.Water retention functions of four nonwoven polypropylene geotextiles[J].Geosynthetics International,1997,4(6):661-672.
[13]Lafleur J,Lebeau M,Faure Y,et al.Influence of matric suction on the drainage performance of polyester geotextiles[C]∥The 53rd Annual Conference of Canadian Geotechnical Society.Montreal,Canada:[s.n.],2000:1115-1122.
[14]李驰,杨柳,乌力吉那顺,等.黄土泥岩接触地带界面滑坡的工程防护模型试验研究[J].岩石力学与工程学报,2016,35(增2):3923-3929.Li Ch,Yang L,Wuliji N Sh,et al.Model experiment of engineering protection on loess-mudstone interfacial landslide[J].Chinese Journal of Rock Mechanics and Engineering,2016,35(Sup2):3923-3929.(in Chinese)
[15]刘传成.内蒙古黄土泥岩地带界面滑坡的室内模型试验研究[D].呼和浩特:内蒙古工业大学,2014.Liu Ch Ch.Indoor model experiment on interfacial landslide about loess-mudstone area in Inner Mongolia[D].Hohhot:Inner Mongolia University of Technology,2014.(in Chinese)
[16]清水河县政府.清水河县自然概况[EB/OL].(2015-5-25)[2016-4-10].http:∥www.nmgqsh.gov.cn/index.php?m=content&c=index&a=show&catid=1383&id=6410.