考虑土拱效应的微型桩组合结构合理桩间距研究  

Research on the Reasonable Pile Spacing of Micro-Pile Composite Structure Considering Soil Arching Effect

作　　者：朱彦鹏[1,2] 成栋 Zhu Yanpeng;Cheng Dong(Western Civil Engineering Disaster Prevention and Mitigation Engineering Research Center,Ministry of Education,Lanzhou University of Technology,Lanzhou 730050,P.R.China;Gansu Provincial Key Laboratory of Disaster Prevention and Mitigation of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,P.R.China)

机构地区：[1]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,兰州730050 [2]兰州理工大学甘肃省土木工程防灾减灾重点实验室,兰州730050

出　　处：《地下空间与工程学报》2024年第5期1624-1633,共10页Chinese Journal of Underground Space and Engineering

基　　金：甘肃省优秀研究生"创新之星"项目(2022CXZX-455);国家自然科学基金(51978321);教育部长江学者和创新团队支持计划项目(IRT_17R51)。

摘　　要：目前,微型抗滑桩及微型桩组合抗滑结构的桩间距一般由工程经验确定,极大地影响了其抗滑性能。针对这一问题,将桩间土拱拱轴线视为抛物线,分别以拱顶或拱脚处土体达到极限状态为控制条件给出最大桩间距计算公式,并与模型试验结果对比分析,验证了其合理性。在此基础上,考虑桩间土拱与桩群间土拱的相互作用,建立了微型桩组合抗滑结构合理桩间距简化计算模型,将简化工程实例计算结果与数值模拟结果对比分析,验证了该计算模型的合理性。本文建立的桩间距计算模型可以为微型桩群桩位的布置提供理论依据。At present,the pile spacing of micro-pile and micro-pile combination anti-skid structure is generally determined by engineering experience,which greatly affects the anti-skid performance.To solve this problem,the axis of the soil arch between piles is assumed to be parabola.Then,the maximum pile spacing formula is given under the control condition that the soil at the arch crown or arch foot reaches the limit state.The rationality is verified by comparing it with the model test results.On this basis,considering the interaction between soil arches between piles and soil arches among pile groups,a simplified calculation model of pile spacing of the structure is established and applied to a simplified engineering example.The results obtained are compared with the numerical simulation results,and the rationality is verified.The calculation model of pile spacing established in this paper can provide a theoretical basis for the pile location of the micropile group.

关 键 词：边坡 微型桩 土拱 桩间距 桩群横向间距 

分 类 号：U213.1[交通运输工程—道路与铁道工程]