土质边坡中部与顶部抗滑桩动力响应和边坡变形比较
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摘要
地震作用及其诱发的变形或滑坡常会使抗滑桩受力发生显著变化,为此,研究了地震作用下不同加固位置的抗滑桩的动力响应和边坡变形情况。试验分析表明:中桩位边坡坡顶变形比高桩位边坡坡顶变形大,但中桩位边坡坡脚堆积变形比高桩位边坡坡脚变形较小;在同样条件下中桩位抗滑桩的静力、动力弯矩小于高桩位抗滑桩相应位置的弯矩;地震结束后由于坡体震动残余变形较大,抗滑桩最终承担着震后残余弯矩,但高桩位抗滑桩的承载能力在震后仍然发挥较大。研究结果表明:高桩位加固位置可以有效发挥抗滑桩的抗弯承载能力,但中桩位可以有效抑制坡底坡脚变形。
The difference of response of stabilizing piles in differently installed position in slope should be properly realized in aseismic design for the reinforced slope.In this paper,the dynamic response of piles in differently installed position and the deformation of slope were compared.Based on the seismic response,the investigation and analyses evaluated the soil arching effect and effectively reinforced effect. According to the observed deformation of crest and bottom in slope,the settlement of slope's peak with piles reinforced near crest of slope is less than that of piles in the middle of slope,and vice versa about the deformation of slope's toe. Further more,the different behavior of the bending moment distribution of piles were discussed in different piles' position in slope. The excess dynamic moments of piles near the crest are more than those of piles in the middle of slope. After the earthquake the residual moments of piles near the crest still are more than the values of piles in the middle of slope.
The difference of response of stabilizing piles in differently installed position in slope should be properly realized in aseismic design for the reinforced slope.In this paper,the dynamic response of piles in differently installed position and the deformation of slope were compared.Based on the seismic response,the investigation and analyses evaluated the soil arching effect and effectively reinforced effect. According to the observed deformation of crest and bottom in slope,the settlement of slope's peak with piles reinforced near crest of slope is less than that of piles in the middle of slope,and vice versa about the deformation of slope's toe. Further more,the different behavior of the bending moment distribution of piles were discussed in different piles' position in slope. The excess dynamic moments of piles near the crest are more than those of piles in the middle of slope. After the earthquake the residual moments of piles near the crest still are more than the values of piles in the middle of slope.
引文
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[13]Yu Yuzhen,Deng Lijun.Centrifuge modeling of seismic behavior of slope reinforced by stabilizing pile[J].Chinese Journal of Geotechnical Engineering,2007,29(9):1320～1323[于玉贞,邓丽军.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]
[14]Yu Yuzhen,Li Rongjian,Li Guangxin,et al.Centrifuge modeling of static and dynamic failure of stabilizing piles in slope[J].Chi-nese Journal ofGeotechnical Engineering,2008,30(7):1090～1093[于玉贞,李荣建,李广信,等.抗滑桩静力与动力破坏离心模型试验对比分析[J].岩土工程学报,2008,30(7):1090～1093]
[15]Li Rongjian,Yu Yuzhen,Chai Lin,et al.Analyses of elastic dy-namic response of model concrete piles near slope peak in dynamic centrifuge modeling test.Water Resources and Hydropower Engi-neering,2008,39(5):47～50[李荣建,于玉贞,柴霖,等.微混凝土抗滑模型桩的地震动力弹性反应试验研究[J].水利水电技术,2008,39(5):47～50]
[2]Zhang Youliang,Feng Xiating,Fan Jianhai,et al.Study on the in-teraction between landslide and Passive Piles[J].Chinese Journal ofRock Mechanics and Engineering,2002,21(6):839～842[张友良,冯夏庭,范建海等.抗滑桩与滑坡体相互作用研究[J].岩石力学与工程学报,2002,21(6):839～842]
[3]Yang ming,Yao Lingkan,Wang Guangjun.Analyses of centrifugalmodel tests of XIGEDA stratum landslide reinforced with piles[J].Highway,2006,(11):1～5[杨明,姚令侃,王广军.昔格达地层滑坡抗滑桩加固离心模型试验研究[J].公路,2006,(11):1～5]
[4]Zhang Liang,Wei Yongxing,Luo Qiang.Study on reinforcement projects for slope flabby subgrade embankment based on centrifugal model tests[J].Journal RailwayEngineering Society,2004,(1):73～76,64[张良,魏永幸,罗强.基于离心模型试验的斜坡软弱土地基路堤加固方案研究[J].铁道工程学报,2004,(1):73～76,64]
[5]Goh ATC,Teh C I,Wong K S.Analysis of piles subjected to em-bankment induced lateral soil movements[J].Journal ofGeotechni-cal and Geoenvironmental Engineering,1997,123(9):792～801
[6]Mezazigh S,Levacher D.Laterally loaded piles in sand:Slope effect on P-Y reaction curves[J].Canadian Geotechnical Journal,1998,35(3):433～441
[7]Yang Ming,Yao Lingkan,Wang Guang-jun.Study on effect of width and space of anti-slide piles on soil arching between piles[J].Chinese Journal ofGeotechnical Engineering,2007,9(10):1477～1482.[杨明,姚令侃,王广军.抗滑桩宽度与桩间距对桩间土拱效应的影响研究[J].岩土工程学报,2007,9(10):1477～1482]
[8]于玉貞,鵜飼?三,井田寿朗.抑止杭効果の三次元?塑性FEMによる評価[A].见:第31回地盤工学研究発表会[C].日本,北海道.1996,31:396～397(in Japanese)
[9]Fei Cai,Keizo Ugai.Numerical Analysis of the stability of a slope reinforced with piles[J].Soils and Foundations.2000,40(1):73～84
[10]Wei Lide,Yang Chunhe,Gao Changsheng.Optimization of slide-resistant piles based on strength reduction method with3D FEM[J].Chinese Journal of Geotechnical Engineering,2005,27(11):1350～1352[韦立德,杨春和,高长胜.基于三维强度折减有限元的抗滑桩优化探讨[J].岩土工程学报,2005,27(11):1350～1352]
[11]Takahashi A,Takemura J,Kawaguchi Y,et al.Stability of piled pier subjected to lateral flow of soils during earthquake[A].In:Kimura,Kusakabe,Takemura,eds.Centrifuge98[C].Rotter-dam,1998:365～370
[12]Satoh H,Ohbo N,Yoshizako K.Dynamic test on behavior of pile during lateral ground flow[A].In:Kimura,Kusakabe,Takemu-ra,eds.Centrifuge98[C].Rotterdam,1998:327～332
[13]Yu Yuzhen,Deng Lijun.Centrifuge modeling of seismic behavior of slope reinforced by stabilizing pile[J].Chinese Journal of Geotechnical Engineering,2007,29(9):1320～1323[于玉贞,邓丽军.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]
[14]Yu Yuzhen,Li Rongjian,Li Guangxin,et al.Centrifuge modeling of static and dynamic failure of stabilizing piles in slope[J].Chi-nese Journal ofGeotechnical Engineering,2008,30(7):1090～1093[于玉贞,李荣建,李广信,等.抗滑桩静力与动力破坏离心模型试验对比分析[J].岩土工程学报,2008,30(7):1090～1093]
[15]Li Rongjian,Yu Yuzhen,Chai Lin,et al.Analyses of elastic dy-namic response of model concrete piles near slope peak in dynamic centrifuge modeling test.Water Resources and Hydropower Engi-neering,2008,39(5):47～50[李荣建,于玉贞,柴霖,等.微混凝土抗滑模型桩的地震动力弹性反应试验研究[J].水利水电技术,2008,39(5):47～50]
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