温度对大型基坑超长混凝土支撑轴力影响研究

作者：林丽芬¹,李萧翰²,李牧羽²

作者简介：

林丽芬,高级工程师,E⁃mail:linlifen@ dtsjy. com

作者单位：

1. 广州地铁设计院施工图咨询有限公司, 广东广州 510010;2. 广州地铁设计研究院股份有限公司,广东广州 510010

基金项目：

∗国家重点研发计划(2022YFC3005203);广东省城市轨道交通工程建造新技术企业重点实验室资助项目(2017B030302009)

摘要：

以广州市某轨道交通大型基坑工程为研究对象,研究超长混凝土支撑轴力在夏季早中晚太阳辐射下的变化规律. 通过现场监测,获得支撑体表温度与支撑轴力数据,分析支撑轴力与温度变化的相关性. 利用最小二乘法对轴力和温度进行拟合,并将拟合公式和现场监测数据进行比较,验证了拟合公式的可靠性. 结果表明,混凝土支撑轴力受温度的影响较大,夏日太阳辐射引起混凝土支撑结构温度大幅升高,进而导致支撑轴力增加,最大可增加 60%. 受温度变化影响,混凝土支撑轴力变化存在滞后性,温度升高 2h 后,支撑轴力发生明显变化. 拟合公式可精准预测混凝土支撑轴力随温度的变化趋势,误差<5%.

关键词：基坑;混凝土;支撑;轴力;监测;温度

English：

Taking a large foundation excavation project of the rail transit in Guangzhou as the researchobject, the variation law of axial force of super⁃long concrete support under solar radiation in themorning, afternoon, and evening of the summer was studied. The surface temperature of the support andthe support axial force data were obtained, and the correlation between the support axial force and thetemperature change was analyzed through on⁃site monitoring. The least square method was used to fit theaxial force and temperature, and the reliability of the fitting formula was verified by comparing the fittingformula with the field monitoring data. The results indicate that the axial force of concrete support isgreatly affected by temperature. The temperature of the concrete support structure is greatly increased bysummer solar radiation, which leads to the increase in support axial force, with the maximum increase of60%. Under the influence of temperature change, the change of axial force of concrete support hashysteresis. After the temperature rises for 2 hours, the axial force of support changes obviously. Thefitting formula can accurately predict the change trend of concrete support axial force with temperature,and the error is less than 5%.

[1]	胡琦,凌道盛,程泽海,等. 温度应力对环形地连墙围护结构受力变形的影响分析 [ J]. 岩土工程学报, 2013, 35 ( 11 ):2139⁃2143.HU Q,LING D S,CHENG Z H,et al. Effects of temperature stresson diaphragm wall of circular deep foundation pit [ J]. Chinesejournal of geotechnical engineering,2013,35(11):2139⁃2143.
[2]	叶林,张怡琦,李翠翠,等. 考虑共同作用的超长混凝土梁温度应力计算分析 [ J]. 施工技术(中英文), 2023, 52 ( 3):113⁃117.YE L, ZHANG Y Q, LI C C. Calculation and analysis oftemperature stress of super long concrete beam consideringinteraction [ J ]. Construction technology, 2023, 52 ( 3 ):113⁃117.
[3]	谭宜玮. 基于温度效应的深基坑长板撑内力预测和预警研究[D]. 广州:华南理工大学,2023.TAN Y W. Research on prediction and early warning of internalforce of long slab bracing in deep foundation pit based ontemperature effect [ D]. Guangzhou: South China University ofTechnology,2023.
[4]	魏星星. 高温差对呼和浩特地铁基坑支撑温度效应影响分析[D]. 北京:中国铁道科学研究院,2018.WEI X X. Influence of high temperature difference on temperatureeffect of foundation pit support in Hohhot metro [ D]. Beijing:China Academy of Railway Sciences,2018.
[5]	彭晓光. 西北干旱地区深基坑支护温度效应研究[D]. 西安:西安工业大学,2022.PENG X G. Research on temperature effect of deep foundation pitretaining in arid area of northwest China [ D]. Xi ’ an: Xi ’ anTechnological University,2022.
[6]	罗川疆. 太阳辐射作用下基坑围护结构非均匀温度效应与力学行为研究[D]. 成都:西南交通大学,2019.LUO C J. Non⁃uniform temperature effect and mechanical behaviorof foundation pit retaining structure under solar radiation [ D].Chengdu:Southwest Jiaotong University,2019.
[7]	向艳. 温度应力对深基坑支护结构内力与变形的影响研究[J]. 岩土工程学报,2014,36(S2):64⁃69.XIANG Y. Influence of temperature stress on internal force anddeformation of retaining structures for deep excavations [ J ].Chinese journal of geotechnical engineering, 2014, 36 ( S2 ):64⁃69.
[8]	徐冠玉,陈俊生,刘自兵,等. 温度对超大超深基坑长板撑支护结构支撑轴力的影响研究[J]. 四川水泥,2023(4):198⁃200.XU G Y,CHEN J S,LIU Z B, et al. Study on the influence oftemperature on the axial force of long plate supporting structure insuper⁃large and ultra⁃deep foundation pit [ J]. Sichuan cement,2023(4):198⁃200.
[9]	范君宇. 深大基坑中水平支撑的温度内力与变形计算[ J]. 山西建筑,2014,40(18):59⁃62.FAN J Y. In deep big hole excavated for building foundation levelsupport temperature endogenic force and distortion computationalmethod[J]. Shanxi architecture,2014,40(18):59⁃62.
[10]	陈林靖,罗一鸣,戴自航. 软土地基坑中坑支护体系温度效应的数值分析[J]. 地质与勘探,2023,59(3):637⁃646.CHEN L J,LUO Y M,DAI Z H. Numerical analysis of temperatureeffect on retaining system for pit⁃in⁃pit excavation engineering insoft soil ground [ J ]. Geology and exploration, 2023, 59 ( 3 ):637⁃646.
[11]	王辉. 温度对地铁基坑混凝土支撑轴力影响分析[ J]. 黑龙江交通科技,2015,38(1):20,22.WANG H. Influence of temperature on axial force of concretesupport in subway foundation pit[J]. Communications science andtechnology Heilongjiang,2015,38(1):20,22.
[12]	CHAPMAN K R, CORDING E J, SCHNABEL H. Performanceof a braced excavation in granular and cohesive soils[C] / / ASCE,Proceedings of the Specialty Conference on Performance of Earthand Earth⁃Supported Structures, 1972.
[13]	郑刚,顾晓鲁. 考虑支撑⁃围护桩⁃土相互作用的基坑支护水平支撑温度应力的简化分析法[ J]. 土木工程学报, 2002, 35(3):87⁃89,108.ZHENG G,GU X L. Simple method for calculating temperaturestress in horizontal strut of foundation pit considering strut⁃pile⁃soilinteraction[J]. China civil engineering journal,2002,35(3):87⁃89,108.
[14]	朱家晖. 佛山大良站基坑横向支撑对围护结构变形影响研究[D]. 西安:长安大学,2019.ZHU J H. Study on the influence of transverse bracing system onthe deformation of enclosure structure of Foshan daliangfoundation pit[D]. Xi’an:Changan University,2019.
[15]	金亚兵,沈翔,劳丽燕. 温度变化对深基坑内支撑轴力和变形的影响研究[J]. 岩土工程学报,2021,43(8):1417⁃1425.JIN Y B,SHEN X,LAO L Y. Influences of temperature change onaxial force and deformation of inner support in deep foundationpits[ J]. Chinese journal of geotechnical engineering, 2021, 43(8):1417⁃1425.
[16]	王琪明. 基坑混凝土支撑轴力监测系统与数据处理方法研究[D]. 绵阳:西南科技大学,2021.WANG Q M. Research on axial force monitoring system and dataprocessing method of concrete bracing in foundation pit [ D].Mianyang:Southwest University of Science and Technology,2021.

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