地震荷载作用下抗滑桩嵌固深度的研究
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摘要
国内外对地震荷载作用下碎石土边坡抗滑桩的最佳嵌固深度研究很少,以往抗滑桩嵌固深度的确定还主要采用经验方法。以云南省文天公路K123+920～+950段的南温碎石土滑坡为研究对象,采用物理模型试验方法,通过对滑坡地质力学条件分析,建立抗滑桩相似试验模型,进行地震荷载作用下抗滑桩不同嵌固深度的变形破坏试验研究,获取抗滑桩变形试验数据。运用传递系数法,分析地震荷载作用下抗滑桩承受的水平荷载与桩体位移的相互关系,确定了碎石土滑坡在一定的滑坡推力条件下,抗滑桩的最佳嵌固深度,最后建立碎石土边坡中抗滑桩最佳嵌固深度的经验判别式。此判别式可作为不同强度下碎石土滑坡中抗滑桩最佳嵌固深度的设计提供参考,也可为地震荷载作用下最佳嵌固深度验算提供帮助。
An empirical discriminate for the optimal embedded depth was proposed through modeling experiments.A case study was conduced in Nanwen gravel-soil landslide of Wentian highway in Yunnan Province.The physical model was based on the analysis of the geological and mechanic conditions,and the simulation of the deformation and failure of piles at different embedded depths under earthquake impact.Then,the relationship between horizontal load and the displacement of the piles was obtained and the discriminate was put forwards for the optimal embedded depth using the transfer coefficient method.The formula could be applied to the design of optimal embedded depth of anti-sliding piles for gravel-soil slopes under different strength conditions,and is helpful for the calculation of optimal embedded depth of anti-sliding piles under earthquake impact.
An empirical discriminate for the optimal embedded depth was proposed through modeling experiments.A case study was conduced in Nanwen gravel-soil landslide of Wentian highway in Yunnan Province.The physical model was based on the analysis of the geological and mechanic conditions,and the simulation of the deformation and failure of piles at different embedded depths under earthquake impact.Then,the relationship between horizontal load and the displacement of the piles was obtained and the discriminate was put forwards for the optimal embedded depth using the transfer coefficient method.The formula could be applied to the design of optimal embedded depth of anti-sliding piles for gravel-soil slopes under different strength conditions,and is helpful for the calculation of optimal embedded depth of anti-sliding piles under earthquake impact.
引文
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[8]Kong Jiming,A Fayou,Wu Wenping.The typical examplesanalysis the types of Wenchuan Earthquake landslide[J].Journal of Soil and Water Conservation,2009,23(6):66-70.[孔纪名,阿发友,吴文平.汶川地震滑坡类型及典型实例分析[J].水土保持学报,2009,23(6):66-70.]
[2]Wang Pengcheng,Zhu Dayong,Xu Qiang.Dynamic responseof slope subjected to intense earthquakes and effect compari-son between various support modes[J].Journal of Hefei U-niversity of Technology,2009,32(10):1501-1504.[汪鹏程,朱大勇,许强.强震作用下加固边坡的动力响应及不同加固方式的比较研究[J].合肥工业大学学报,2009,32(10):1501-1504.]
[3]Yang Xu.Research on the embedded depth of anti-slide pilein Xigeda Rock[D].Chengdu:Southwest Jiaotong Universi-ty,2005.[杨旭.昔格达组地层中抗滑桩的嵌固深度研究[D].成都:西南交通大学,2005.]
[4]Li Rongjian,Yu Yuzhen,Lv He,et al.Design of model con-crete piles to reinforced slopes for dynamic centrifuge tests[J].Journal of Tsinghua University,2009,49(9):66-70.[李荣建,于玉贞,吕禾,等.动力离心模型试验中微混凝土抗滑模型桩的设计[J].清华大学学报,2009,49(9):66-70.]
[5]Chen L T,Poulos H G,Hull T S.Piles subjected to lateralsoil movements[J].Journal of Geotechnical and Geoenviron-mental Engineering,ASCE,1997,123(9):802-805.
[6]Xu Jiancong,Shang Yuequan.Study on mechanism of disin-tegration deformation and failure of debris landslide underrainfall[J].Rock and Soil Mechanics,2008,29(1):107-112.[许建聪,尚岳全.降雨作用下碎石土滑坡解体变形破坏机制研究[J].岩土力学,2008,29(1):107-112.]
[7]Rowe R K,Poulos H G.A method for predicting the effect ofpiles on slope behavior[C].Third Internationnal Conferenceon Numerical Methods in Geomechanics,Aachen,1979,3:1073-1085.
[8]Kong Jiming,A Fayou,Wu Wenping.The typical examplesanalysis the types of Wenchuan Earthquake landslide[J].Journal of Soil and Water Conservation,2009,23(6):66-70.[孔纪名,阿发友,吴文平.汶川地震滑坡类型及典型实例分析[J].水土保持学报,2009,23(6):66-70.]
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