摘要
以云南某特大拱桥为对象,利用简化力学模型,在拱座重量、偏心及不同荷载组合条件下,分析了强风化泥灰岩地基、基底竖桩和斜桩的承载安全性。研究结果表明:在深、宽修正条件下,基底应力满足地基承载要求。各工况的竖桩和斜桩受力均满足桩基承载力要求。基于桩基实际受力进行的桩长反分析,确定边界竖桩最大有效桩长63.5m,中心竖桩最大有效桩长48.4m,边界斜桩最大有效桩长36.0m,中心斜桩最大有效桩长30.3m。该简化分析模型可为拱桥拱座承载安全评价提供参考。
A grand arch bridge in South west mouwtainous area is studied. Using simpli fied mechanical model,the bearing safety of intense weathering muddy limestone founda ＂don,the verdcal pile and ＂the batter pile under differewt loading condPdons wPth or wPth om weight and eccewtricPty are respecdvely esdmated. The resuhs show ＂that all ＂the basal stress under differewt load condPdons can meet ＂the requiremewts of ＂the ground bearing capacPty with depth and wi＆h modificadon considered. Forces clone on verdcal piles and batter piles are all less ＂than ＂their bearing capacPty. According ＂to pracdcal forces clone on piles, using back analysis method obtains opdmal pile length. The boundary verdcal piles opdmal length is 63.5 re,and ＂that of middle verdcal pile is 48.4 m. The boundary batter piles opdmal length is 36.0 m, and ＂that of middle batter pile is 30.3 m. The simplified mechanical analysis model can be used in bearing safety esdmadon of arch bridges.
作者
周晓靖
汪磊
尹小涛
陈永亮
ZHOU Xiao-jing;WANG Lei;YIN Xiao-tao;CHEN Yong-liang(Yunnan Tongda Highway Extension Projection Co.,Ltd.,Dali 671000,China;Yunnan Dayong Higway Project Construction Headquarters,Dali 671000,China;Broadvision Engineering Consultants,Kunming 650041,China;State Key Laboratory o{ Geomechanics and Geotechnical Engineering,Institute o{ Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China)
出处
《交通科学与工程》
2018年第3期12-19,共8页
Journal of Transport Science and Engineering
基金
国家自然科学基金项目(51778609)
云南省交通科技项目(云交科教[2017]23号)
关键词
拱桥拱座
基底应力
地基承载力
桩基承载力
承载安全
arch bridge＇s abmment
basal stress
ground bearing capacPty
bearing capacity of pile foundation
bearing safety
