基于土拱效应下的地震作用与抗滑桩桩间距关系分析
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摘要
基于抗滑桩桩间土土拱效应,建立在地震作用下土拱效应的力学分析模型,在Mononobe-Okabe理论的基础上,将土拱作用等效为挡土墙作用,提出在一定地震设防烈度下土拱面上水平地震力的计算方法;在考虑滑坡推力和地震力两种外力作用下,依据桩间土在极限平衡状态下的静力平衡条件和强度条件,得出桩间净距理论计算公式。工程实例和系列试算表明,同等条件下,考虑地震作用比不考虑地震作用桩间净距要减小4%~23%,由此得出不同抗震设防等级下桩间净距计算的折减系数和桩间净距直接折减计算公式,以指导抗滑桩工程设计。
Based on the soil arch effect among anti-slide piles,the mechanics analysis model of soil arch effect for seismic action is established.On the basis of the Mononobe-Okabe theory and assuming that the soil arch effect is equivalent to retaining wall effect,the calculation method of the horizontal seismic force in the soil arch surface is presented under the seismic fortification intensity.According to the static equilibrium condition and strength condition of piles soil in the limit equilibrium state,the landslide thrust and seismic force is considered and the theoretical calculation formula of spacing between piles are otabined.Under the same conditions,engineering examples and series of trial show that spacing between piles reduce from 4% to 23% when the seismic action is considered.The calculation formula of direct reduction factor and reduction coefficient for spacing between piles in different seismic fortification levels are attained.
Based on the soil arch effect among anti-slide piles,the mechanics analysis model of soil arch effect for seismic action is established.On the basis of the Mononobe-Okabe theory and assuming that the soil arch effect is equivalent to retaining wall effect,the calculation method of the horizontal seismic force in the soil arch surface is presented under the seismic fortification intensity.According to the static equilibrium condition and strength condition of piles soil in the limit equilibrium state,the landslide thrust and seismic force is considered and the theoretical calculation formula of spacing between piles are otabined.Under the same conditions,engineering examples and series of trial show that spacing between piles reduce from 4% to 23% when the seismic action is considered.The calculation formula of direct reduction factor and reduction coefficient for spacing between piles in different seismic fortification levels are attained.
引文
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[14]王立强,王元战,迟丽华.挡土墙地震土压力及其分布[J].中国港湾建设,2007(5):1-2.[WANG L Q,WANG Y Z,CHI L H.Distribution of seismic soil pressure on a retaining wall[J].China Harbour Engineering,2007(5):1-2.(in Chinese)]
[15]林宇亮,杨果林,赵炼恒,等.地震动土压力水平层分析法[J].岩石力学与工程学报,2010,29(12):2581-2585.[LIN Y L,YANG G L,ZHAO L H,et al.Horizontal slices analysis method for seismic earthpressure calculation[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(12):2581-2585.(in Chinese)]
[16]GB50111—2006铁路工程抗震设计规范[S].北京:中国计划出版社,2009.[GB50111—2006 Code for Seismic Design of Railway Engineering[S].Beijing:China Planning Press,2009.(in Chinese)]
[17]焦赟.高烈度地震区抗滑桩锚固深度可靠性分析[J].路基工程,2012(5):5-8.[JIAO Y.Reliability analysis of anchoring depth for friction piles in high intensity earthquake zone[J].Subgrade Engineering,2012(5):5-8.(in Chinese)]
[2]罗渝,何思明,何尽川.地震作用下抗滑桩作用机制研究[J].长江科学院院报,2010,27(6):26-29.[LUO Y,HE S M,HE J C.Study on interaction between slope and stabilizing pileunder seism loading[J].Journal of Yangtze River Scientific Research Institute,2010,27(6):26-29.(in Chinese)]
[3]李海光.新型支挡结构设计与工程实例[M].北京:人民交通出版社,2011.[LI H G.New Retaining Structure Design and Engineering Example[M].Beijing:China Communications Press,2011.(in Chinese)]
[4]TERZAGHI K.Theoretical soil mechanics[M].New Youk:JohnWiley&Sons,1943.
[5]胡晓军,王建国.边坡加固工程中抗滑桩间距的确定[J].河海大学学报:自然科学版,2007,35(3):330-333.[HU X J,WANG J G.Determination of anti-slide pile spacing inside slope consolidation project[J].Journal of Hohai University:Natural Sciences,2007,35(3):330-333.(in Chinese)]
[6]周应华,周德培,冯君.推力桩桩间土拱几何力学特性及桩间距的确定[J].岩土力学,2006,27(3):455-462.[ZHOU Y H,ZHOU D P,FENG J.Geometrically mechanical characters of soil arch between two adjacent laterallyloaded piles and determination of suitable pile spacing[J].Rock and Soil Mechanics,2006,27(3):455-462.(in Chinese)]
[7]郑磊,殷坤龙,简文星,等.抗滑桩设计中关于确定桩间距问题的分析[J].水文地质与工程地质,2006,33(6):71-74.[ZHENG L,YIN K L,JIAN W X,et al.Analysis on spacing between piles in the design of anti-slide pile[J].Hydrogeology and Engineering Geology,2006,33(6):71-74.(in Chinese)]
[8]赵明华,廖彬彬,刘思思.基于拱效应的边坡抗滑桩桩间距计算[J].岩土力学,2010,31(4):1211-1214.[ZHAO M H,LIAO B B,LIU S S.Calculation of anti-slide piles spacing based on soil arching effec[J].Rock and Soil Mechanics,2010,31(4):1211-1214.(in Chinese)]
[9]王成华,陈永波,林立相.抗滑桩间土拱力学特性与最大桩间距分析[J].山地学报,2001,19(6):556-559.[WANG C H,CHEN Y B,LIN L X.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)]
[10]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,2007,29(10):1477-1481.[YANG M,YAO Li K,WANG G J.Study on effect of width and space of anti-slide piles on soil arching between piles[J].Chinese Journal of Geotechnical Engineering,2007,29(10):1477-1481.(in Chinese)]
[11]冯君,吕和林,王成华.普氏理论在确定抗滑桩间距中的应用[J].中国铁道科学,2003,24(6):79-81.[FENG J,LV H L,WANG C H.Application of M.M.PROMOJIYFAKONOV Theory to Solution of Distance between Anti-slide Piles[J].China Railway Rcience,2003,24(6):79-81.(in Chinese)]
[12]顾慰慈.挡土墙土压力计算手册[M].北京:中国建材工业出版社,2005.[GU W C.Calculation manual for earth pressure on retaining wall[M].Beijing:China Building Material Industry Publishing House,2005.(in Chinese)]
[13]卢坤林,杨扬,朱大勇,等.考虑土拱效应的挡土墙地震土压力及其分布[J].水电能源科学,2010,28(5):65-68.[LU K L,YANG Y,ZHU D Y,et al.Seismic earth pressure on retaining wall considering soil arching effects and its distribution[J].Water Resources and Power,2010,28(5):65-68.(in Chinese)]
[14]王立强,王元战,迟丽华.挡土墙地震土压力及其分布[J].中国港湾建设,2007(5):1-2.[WANG L Q,WANG Y Z,CHI L H.Distribution of seismic soil pressure on a retaining wall[J].China Harbour Engineering,2007(5):1-2.(in Chinese)]
[15]林宇亮,杨果林,赵炼恒,等.地震动土压力水平层分析法[J].岩石力学与工程学报,2010,29(12):2581-2585.[LIN Y L,YANG G L,ZHAO L H,et al.Horizontal slices analysis method for seismic earthpressure calculation[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(12):2581-2585.(in Chinese)]
[16]GB50111—2006铁路工程抗震设计规范[S].北京:中国计划出版社,2009.[GB50111—2006 Code for Seismic Design of Railway Engineering[S].Beijing:China Planning Press,2009.(in Chinese)]
[17]焦赟.高烈度地震区抗滑桩锚固深度可靠性分析[J].路基工程,2012(5):5-8.[JIAO Y.Reliability analysis of anchoring depth for friction piles in high intensity earthquake zone[J].Subgrade Engineering,2012(5):5-8.(in Chinese)]
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