排架式微型桩组合结构受力分析  

An Analysis of Mechanical Behaviors of Row Micro-pile Composite Structure

作　　者：徐小林[1,2,3] 王全才[1,2] 王浩[1,2,3] 吴清[1,2,3] 

机构地区：[1]中国科学院山地灾害与地表过程重点实验室,四川成都610041 [2]中国科学院水利部成都山地灾害与环境研究所,四川成都610041 [3]中国科学院大学,北京100049

出　　处：《水土保持通报》2013年第1期280-284,共5页Bulletin of Soil and Water Conservation

基　　金：中国科学院知识创新项目"震裂坡地暴雨型泥石流滑坡物源的分布规律与孕灾环境变化"(KZCX2-YW-332);国家自然科学基金项目"新型围桩-土耦合式抗滑桩作用机理及计算方法研究"(51068006)

摘　　要：排架式微型桩组合结构作为边坡防护的一种轻型支挡结构,施工安全便捷,对非常环境适应性强。基于弹性地基梁理论应用的基本条件是土体为稳定体,以及排架式微型桩组合结构对不稳定坡体的改善作用使不同位置的微型桩前抗力条件有所差别,在弹性地基梁理论的基础上,借鉴一般微型桩水平承载力计算的思路,通过不同的m(弹性抗力系数)计算值和桩顶大变形对m值的限定条件,来体现微型桩前其他微型桩的存在对地基反力的贡献。以3种基本计算模型建立排架式微型桩组合结构的计算公式,计算并分析该类桩群的内力及对地震力的特殊反应,为微型桩的设计提供一定的参考依据。The composite structure of row posture micro piles, as a light-weight protection structure in side- slope protection, has the advantages of safe and quick construction and high adaptability to some special envi ronments. A basic requirement of the elastic foundation beam theory application is that the foundation should be stable. Because the row posture micro-piles composite structure improves the stability of slope, the resist ant forces in front of different positions of micro-piles are different. On the basis of the elastic foundation- beam theory and by using the idea of the general micro piles horizontal bearing capacity calculation method, the row posture micro-piles advantages are revealed by the different calculated rn（the coefficient of rock re- sistance） values and the limited conditions of pile top large deformation. The computational formula of row posture micro pile composite structure is established from three basic calculation models. The special re- sponse to seismic force is calculated and analyzed in a practical case, which may provide certain reference for the micro-piles design.

关 键 词：弹性地基梁 桩前抗力 地震力 微型桩 组合结构 桩顶大变形 

分 类 号：TU47[建筑科学—结构工程]