摘要
依托浅埋四孔小净距隧道工程实践,基于行车动载理论,建立了三维弹性半空间隧道振动分析模型,分析车速和载重等10种激励作用下隧道竖向位移及应力响应规律。结果表明,在不同激励力作用下中隔带路面沉降最大,影响范围至隧道拱腰-拱脚位置,呈倒槽型分布,且4条隧道均在拱顶出现位移峰值,峰值随载重大致呈线性关系,车行及人行隧道位移曲线近似呈镜面对称的“漏斗型”曲线和渐变曲线。隧道最大主应力峰值主要分布于左、右拱肩,主应力峰值随载重大致呈线性关系。车行及人行隧道主应力近似呈镜面对称的不规则“双峰型”曲线和渐变曲线。公路下穿段范围隧道位移及主应力变化速率较大,但车速对隧道竖向位移及主应力影响并不明显,载重是关键影响因素。结合分析结果,给出了监控加密部位、交通管制及加固措施等建议。
Based on the engineering practice of shallow-buried four-holes small-clear distance tunnel, a three-dimensional elastic half-space tunnel vibration analysis model was established based on the dynamic theory of traffic load, and the vertical displacement and stress response law of tunnel under 10 kinds of excitation such as speed and load were analyzed. The results show that the settlement of the median pavement is the largest under different excitation forces, and the influence range is to the arch waist and arch foot of the tunnel, showing an inverted trough type distribution. The displacement peak values of the four tunnels appear on the vault, and the peak values show a linear relationship with the load. The displacement curves of the vehicular tunnel and pedestrian tunnel are similar to the mirror symmetrical "funnel" curve and gradual change curve. The maximum stress peak value of the tunnel is mainly distributed in the left and right arch shoulders, and the peak stress is linear with the load. The main stress of the tunnel is approximately mirror symmetrical irregular "double peak" curve and gradual curve. The change rate of tunnel displacement and principal stress in the highway underpass section is large, but the vehicle speed has no obvious effect on the vertical displacement and principal stress of the tunnel, and the load is the key factor. Combined with the analysis results, some suggestions such as densifying monitoring parts, traffic control and reinforcement measures were put forward.
作者
姚志雄
刘耀星
张忠星
曾子扬
邓历振
Yao Zhixiong;Liu Yaoxing;Zhang Zhongxing;Zeng Ziyang;Deng Lizhen(Department of Civil Engineering,Fujian University of Technology,Fuzhou 350118,P.R.China;Key Laboratory of Underground Engineering,Fujian Province University,Fuzhou 350118,P.R.China;Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering,Fuzhou 350118,P.R.China;China Railway 24th Bureau Group Fujian Railway Construction Co.,Ltd.,Fuzhou 351111,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2022年第4期1363-1373,共11页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金项目(51504070)
福建省自然科学基金项目(2021J011061)
中铁二十四局集团有限公司科技项目(GY-H-20111)
中土集团福州勘察设计研究院有限公司科技项目(GY-H-21014)
福建工程学科科技项目(GY-Z21051)。
关键词
交通荷载
小净距隧道
振动分析模型
载重
最大主应力
traffic load
small spacing tunnel
vibration analysis model
load
maximum principal stress
