坡顶加载时黏性土坡土钉加固前后的离心模型试验比较研究
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摘要
为研究坡顶加载条件下黏性土坡的承载特性和变形规律,进行了素土坡和土钉加固土坡的加载离心模型试验。测量了土坡的承载和变形过程。通过对比两种土坡的承载特性和变性规律,土钉的加固作用体现在:限制了土坡向坡面方向的位移,使土坡的承载能力得到了明显提高;在加固土坡内形成的土钉影响区域改善了加载底板边缘处的薄弱程度;增大了土坡中上部土体的竖向压缩变形,减小了剪切变形,增强了土坡的稳定性。土坡上部土钉的加固效果随着坡顶荷载的增大而越明显;土坡中下部土与土钉的相互作用越靠近坡面越强。
In order to investigate the bearing behavior and deformation rules of cohesive soil slopes during crest loading,centrifuge model tests of unreinforced slope and soil nail-reinforced slope were conducted.The loading and deformation process were observed and measured.Based on the comparison of bearing capacity and deformation rules between the unreinforced and soil nail-reinforced slope,the results show that soil nails improve the bearing capacity of slope obviously by confining the displacement toward slope surface.The deformation on the weakest location-footing edge is enhanced due to a nail-influence zone formed in reinforced slope;compression deformation of soil in middle and upper parts of slope is increased and shear deformation of which is decreased,resulting in the strengthening of slope stability.Soil nails in upper parts of reinforced slope has much more significant effects on reinforcing as load increased.Also in middle and lower parts of slope,the interaction between soil and nails becomes intensive near the slope surface.
In order to investigate the bearing behavior and deformation rules of cohesive soil slopes during crest loading,centrifuge model tests of unreinforced slope and soil nail-reinforced slope were conducted.The loading and deformation process were observed and measured.Based on the comparison of bearing capacity and deformation rules between the unreinforced and soil nail-reinforced slope,the results show that soil nails improve the bearing capacity of slope obviously by confining the displacement toward slope surface.The deformation on the weakest location-footing edge is enhanced due to a nail-influence zone formed in reinforced slope;compression deformation of soil in middle and upper parts of slope is increased and shear deformation of which is decreased,resulting in the strengthening of slope stability.Soil nails in upper parts of reinforced slope has much more significant effects on reinforcing as load increased.Also in middle and lower parts of slope,the interaction between soil and nails becomes intensive near the slope surface.
引文
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[2]LEE K M,MANJUNATH V R.Experimental and numerical studies of geosynthetic-reinforced sand slopes loaded with a footing[J].Canadian Geotechnical Journal,2000,37:828-842.
[3]CHUNGSIK Y.Laboratory investigation of bearing capacity behavior of strip footing on geogrid-reinforced sand slope[J].Geotextiles and Geomembranes,2001,19:279-298.
[4]高文华,BATHURST R J.条形荷载作用下加筋土边坡稳定性分析[J].岩石力学与工程学报,2007,26(2):374-380.GAO Wen-hua,BATHURST R J.Stability analysis of reinforced slope loaded by a strip footing[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(2):374-380.
[5]SAWWAF M E.Experimental and numerical study of strip footing supported on stabilized sand slope[J].Journal of Geotechnical and Geoenvironmental Engineering,2009,28(4):311-323.
[6]张嘎,王爱霞,张建民,等.土工织物加筋土坡变形和破坏过程的离心模型试验[J].清华大学学报(自然科学版),2008,48(12):2057-2060.ZHANG Ga,WANG Ai-xia,ZHANG Jian-min,et al.Centrifuge modeling of the failure of geotexile-reinforced slopes[J].Journal of Tsinghua University(Science and Technology),2008,48(12):2057-2060.
[7]于玉贞,邓丽君.抗滑桩加固边坡地震响应离心模型试验[J].岩土工程学报,2007,29(9):1320-1323.YU Yu-zhen,DENG Li-jun.Centrifuge modeling of seismic behavior of slopes reinforced by stabilizing pile[J].Chinese Journal of Geotechnical Engineering,2007,29(9):1320-1323.
[8]张建红,张雁,濮家骝,等.土钉支护的离心模型试验研究[J].土木工程学报,2009,42(1):76-80.ZHANG Jian-hong,ZHANG Yan,PU Jia-liu,et al.Centrifuge modeling of soil nail reinforcements[J].Chinese Civil Engineering Journal,2009,42(1):76-80.
[9]ZHANG G,HU Y,ZHANG J M.New image analysis-based displacement-measurement system for geotechnical centrifuge modeling tests[J].Measurement,2009,42:87-96.
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