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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第9卷    第5期    总第49期    2012年10月

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文章编号:1672-7029( 2012) 05-0054-05
微型抗滑桩组合结构模型试验与结构影响分析
胡毅夫1,王庭勇1,唐承铁2

(1.中南大学资源与安全工程学院,湖南长沙410083; 2.湖南省高速公路管理局,湖南长沙410001)

摘 要: 基于微型抗滑桩组合结构的研究长期集中在桩土相互作用,忽视了桩体结构体系的组合结构特性,通过模型试验,得到前后桩的弯矩分布,发现前桩弯矩明显比后桩的小,前后桩弯矩比约为0.65。利用结构力学位移法,对微型桩组合结构弯矩分布进行讨论,发现提高连梁线刚度有利于弯矩在前后桩的分配; 提出了组合结构差异抗弯刚度设计,前桩刚度应小于后桩刚度,为了更好地与弯矩分布匹配,建议实际工程中前桩桩径为后桩桩径的0.6 ~ 0.8 倍。

 

关键字: 边坡工程; 模型试验; 微型桩; 微型桩组合结构; 结构影响

Model test of micro-pile composite structure and the impact of composite structure
HU Yi-fu1,WANG Ting-yong1,TANG Cheng-tie2

1.School of Resources and Safety Engineering,Central South University,Changsha 410083,China;
2.Hunan Highway Administration,Changsha 410012,China

Abstract:The research based on anti-slide micro-piles composite structure has been long focused on the pile-soil interaction,cohile the struatural chanacteristic of the micro-piles composite structure was neglected.The bending moment distribution of the front and back pile was obtained by model test and found the moment of front pile is less than the back pile’s obviously,the ratio is about 0.65.The bending moment distribution of the micro-pile composite structure was discussed by using displacement method.The results show that improving stiffness of the coupling beam is beneficial to distribute the bending moment between the front and back pile.Considering the front pile’s sitffness should be Less than the back pile’s,the method of composite structure’s different bending stiffness design was put forward.In order to match bending moment distribution better,it is suggested that the front pile diamefer is 0.6—0.8 times the back pile’s in the practical project.

 

Key words: slope engineering; model experiment; micro-piles; micro-piles composite structure; structure impact

ISSN 1672-7029
CN 43-1423/U

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