明挖地铁隧道基坑围护桩优化方案分析
赵秀绍1,2王际凯1,2侯世磊4张晗秋3石钰锋1,2
Analysis of Retaining Pile Optimization Scheme for Open Excavation Metro Tunnel Foundation Pit
ZHAO XiushaoWANG JikaiHOU ShileiZHANG HanqiuSHI Yufeng
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作者信息:1.1.华东交通大学土木建筑学院，330013，南昌；
2.2.江西省地下空间技术开发工程研究中心，330013，南昌；
3.3.南昌轨道交通集团有限公司，330038，南昌；
4.4.中铁十四局集团有限公司，250101，济南
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Affiliation:School of Civil Engineering and Architecture, East China Jiaotong University, 330013, Nanchang, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2023.05.008
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中图分类号/CLCN:U445.45; TU476+.9
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栏目/Col:研究报告
摘要:
为了降低地铁围护结构的工程造价，以南昌艾溪湖地铁隧道为例，采用数值模拟结合现场测试的方法，从围护桩桩长、桩径和短桩配比等方面分析了地铁围护结构长短桩方案的可行性。研究结果表明：围护桩的水平位移随着其桩长和桩径的减小，以及短桩数量的增多而逐渐增大，但总体而言其变化幅度较小;优化方案的围护桩最大水平位移为4.59 mm；参数优化虽然会使原方案的弯矩和位移略有增大，但其仍在安全系数的变化范围内，且优化方案较原方案在经济性方面更有优势。根据数值分析结果，优化方案的参数建议设为：长桩桩长为16 m，桩径为0.8 m；短桩桩长为10 m，桩径为0.6 m；长短桩配比为一长三短。
Abstracts:
To reduce the engineering cost of metro retaining structure, taking the Aixihu Metro Tunnel in Nanchang City as an example, using the method of numerical simulation combined with field test results, from the perspective of pile length, pile diameter and short retaining pile ratio, the feasibility of long and short pile scheme for metro retaining structure is discussed. Research results show that: (1) the horizontal displacement of the pile gradually increases with the reduction of pile length and pile diameter and the increase of the number of short piles, but the change amplitude is small in general, the maximum horizontal displacement of the optimized scheme is 4.59 mm; (2) although parameter optimization will make the bending moment and displacement of the original scheme increase slightly, it is still within the variation range of the safety coefficient, while the optimized scheme is more economical than the original scheme. According to the results of numerical analysis, the optimized scheme is recommended to be: long pile length 16 m and pile diameter 0.8 m; short pile length 10 m and pile diameter 0.6 m. The ratio of long and short piles is one to three.
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