既有暗挖车站上盖增层基坑围护结构力学效应研究
梁尔斌
Mechanical Effect of Enclosure Structure of Existing Underground Excavated Station Overlaying Level Foundation Pit
LIANG Erbin
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作者信息:中铁十四局集团有限公司， 250014， 济南
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Affiliation:Author′s address: China Railway 14th Group Co., Ltd., 250014, Ji′nan, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2022.04.015
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中图分类号/CLCN:TU311.2;TU94+2
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栏目/Col:研究报告
摘要:
既有暗挖地铁车站的上盖增层扩建明挖基坑直接坐落在既有车站拱顶，既有车站结构和基坑围护结构之间存在复杂的相互影响。基于北京地铁苹果园站，针对围护结构嵌固桩与无嵌固桩的受力特点，建立三维有限元数值模型，对不同桩体展开关键参数分析，并对围护桩桩体及既有结构的受力变形规律进行深入分析。研究结果表明：无嵌固桩底部与既有车站结构不连接时，桩体最大位移比二者连接时增大约27倍；随着嵌固桩桩体与既有车站结构距离的增加，桩与车站结构间的土体变形呈趋于平缓的非线性增加，且嵌固桩位移增大、受力减小；当桩体与既有车站结构距离大于47 m后，桩体位移和受力基本不再变化；桩体嵌固深度对桩体受力变形影响主要体现在桩体下半部分；随着嵌固深度的增加，桩体最大位移最多可减少约169％。
Abstracts:
The overlaying level open excavation foundation pit of existing underground excavated metro station is located above the arch of the existing station directly. There are complex interactions between the existing station structure and the foundation pit enclosure structure. Based on Beijing Metro Pingguoyuan Station, targeting the stress characteristics of enclosure structure with embedded or nonembedded retaining piles, threedimensional finite element models are established to carry out the key parametric analysis on different piles, and to analyze the stress deformation pattern of enclosure piles and existing structure indepth. Research results show that when the bottom of the nonembedded retaining pile walls is connected to the existing station structure, the maximum displacement of the pile is increased by about 2.7 times. As the distance between the embedded retaining pile wall and the existing station structure increases, the soil deformation between the pile and the station structure shows a nonlinear increase tending to be gentle. The displacement of the embedded retaining pile wall increases and the inner force decreases. When the distance is greater than 4.7 m, displacement and the force almost stop changing. The effect of the pile embedded depth on the force and deformation of the pile is mainly in the lower part of the pile. As the embedded depth increases, the maximum displacement decreases by about 16.9%.
引文 / Ref:
梁尔斌. 既有暗挖车站上盖增层基坑围护结构力学效应研究. 城市轨道交通研究, 2022, 25(4): 70.
LIANG Erbin. Mechanical effect of enclosure structure of existing underground excavated station overlaying level foundation pit. Urban Mass Transit, 2022, 25(4): 70
LIANG Erbin. Mechanical effect of enclosure structure of existing underground excavated station overlaying level foundation pit. Urban Mass Transit, 2022, 25(4): 70
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