桩间复合结构土拱效应试验与受力机制研究
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摘要
西南山区高陡边坡多采用桩与桩间墙、桩板墙、桩间土钉墙的组合加固结构,由于土拱效应的存在,桩及桩间结构的受力发生重分布。利用自制的土拱试验仪,考虑桩间土体的内摩擦角对桩间土拱的影响,对不同桩间距、桩截面尺寸的试验模型进行对比试验,探讨土拱的形状、土拱效应对边坡坡体应力分布的影响,提出土拱拱高和拱轴线方程。结合某铁路高边坡的桩间挡土墙加固结构,提出考虑土拱效应的边坡潜在滑移面的剩余下滑力的计算方法,并与传统计算方法进行对比。
At the southwest mountain areas,the composite structures,such as piles and retaining wall,plank wall,soil nailing wall,were applied to support high engineering slopes. Because of the soil arch effection,the soil pressure of the composite structure are redistributed. Considering the influence of soil friction angle,the contrast tests using the soil arch test machine(the patent No. is ZL200910058441.6) were conducted. The differences between those tests were soil friction angle,pile space and pile section dimension. The shape of soil arch,the soil pressure distribution caused by soil arch were analyzed. The equations of height and axis of soil arch considering the soil friction angle were suggested. A case history,considering soil arch effect,the support structure composited by piles and retaining wall was analyzed. Considering the effect of soil arch,a calculation method of potential slip surface and soil pressure on the retaining wall was put forward,and compared with the tradition method.
At the southwest mountain areas,the composite structures,such as piles and retaining wall,plank wall,soil nailing wall,were applied to support high engineering slopes. Because of the soil arch effection,the soil pressure of the composite structure are redistributed. Considering the influence of soil friction angle,the contrast tests using the soil arch test machine(the patent No. is ZL200910058441.6) were conducted. The differences between those tests were soil friction angle,pile space and pile section dimension. The shape of soil arch,the soil pressure distribution caused by soil arch were analyzed. The equations of height and axis of soil arch considering the soil friction angle were suggested. A case history,considering soil arch effect,the support structure composited by piles and retaining wall was analyzed. Considering the effect of soil arch,a calculation method of potential slip surface and soil pressure on the retaining wall was put forward,and compared with the tradition method.
引文
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[7]周德培,肖世国,夏雄,等.边坡工程中抗滑桩合理桩间距的探讨[J].岩土工程学报,2004,26(1):132–135.(ZHOU Depei,XIAO Shiguo,XIA Xiong,et al.Discussion on rational spacing between adjacent anti-slide piles in some cutting slope projects[J].Chinese Journal of Geotechnical Engineering,2004,26(1):132–135.(in Chinese))
[8]吴子树,张利民,胡定,等.土拱的形成机制及存在条件的探讨[J].四川联合大学学报,1995,(2):15–19.(WU Zishu,ZHANG Limin,HU Ding.Studies on the mechanism of arching action in loess[J].Journal of Sichuan Union University,1995,(2):15–19.(in Chinese))
[9]张建勋,陈福全,简红珏.被动桩中土拱效应问题的数值分析[J].岩土力学,2004,25(2):174–178.(ZHANG Jianxun,CHEN Fuquan,JIAN Hongyu.Numerical analysis of soil arching effects in passive piles[J].Rock and Soil Mechanics,2004,25(2):174–178.(in Chinese))
[10]张建华,谢强,张照秀.抗滑桩结构的土拱效应及其数值模拟[J].岩石力学与工程学报,2004,23(4):699–703.(ZHANG Jianhua,XIE Qiang,ZHANG Zhaoxiu.Arching effect of anti-slide pile structure and its numerical simulation[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(4):699–703.(in Chinese))
[2]CHEN L T,POULOS H.G,HULL T S.Model tests on pile groups subjected to lateral soil movement[J].Soils and Foundations,1997,37(1):1–12.
[3]ADACHI T,KIMURA M,TADA S.Analysis on the preventive mechanism of landslide stabilizing piles[C]//Proceedings of the 3rd Int.Symp.on Numerical Models in Geomechanics,[S.l.]:[s.n.],691–698.
[4]HANDY L R.The arch in soil arching[J].Journal of Geotechnical Engineering,1985,111(3):302–318.
[5]王成华,陈永波,林立相,等.抗滑桩间土拱特性及最大桩间距分析[J].山地学报,2001,19(6):556–559.(WANG Chenghua,CHEN Yongbo,LIN Lixiang,et al.Soil arch mechanical character and suitable space between one another anti-sliding pile[J].Journal of Mountain Science,2001,19(6):556–559.(in Chinese))
[6]冯君,吕和林,王成华.普式理论在确定抗滑桩桩间距中的作用[J].中国铁道科学,2003,24(6):79–81.(FENG Jun,LU Helin,WANG Chenghua.Application of M.M.promojiyfakonov theory to solution of distance between anti-slide piles[J].China Railway Science,2003,24(6):79–81.(in Chinese))
[7]周德培,肖世国,夏雄,等.边坡工程中抗滑桩合理桩间距的探讨[J].岩土工程学报,2004,26(1):132–135.(ZHOU Depei,XIAO Shiguo,XIA Xiong,et al.Discussion on rational spacing between adjacent anti-slide piles in some cutting slope projects[J].Chinese Journal of Geotechnical Engineering,2004,26(1):132–135.(in Chinese))
[8]吴子树,张利民,胡定,等.土拱的形成机制及存在条件的探讨[J].四川联合大学学报,1995,(2):15–19.(WU Zishu,ZHANG Limin,HU Ding.Studies on the mechanism of arching action in loess[J].Journal of Sichuan Union University,1995,(2):15–19.(in Chinese))
[9]张建勋,陈福全,简红珏.被动桩中土拱效应问题的数值分析[J].岩土力学,2004,25(2):174–178.(ZHANG Jianxun,CHEN Fuquan,JIAN Hongyu.Numerical analysis of soil arching effects in passive piles[J].Rock and Soil Mechanics,2004,25(2):174–178.(in Chinese))
[10]张建华,谢强,张照秀.抗滑桩结构的土拱效应及其数值模拟[J].岩石力学与工程学报,2004,23(4):699–703.(ZHANG Jianhua,XIE Qiang,ZHANG Zhaoxiu.Arching effect of anti-slide pile structure and its numerical simulation[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(4):699–703.(in Chinese))