摘要
【目标】现有隧道台车模版荷载取值常参考建筑施工模板荷载计算方法,但隧道二衬浇注与建筑施工浇注存在显著差别。为解决现有台车模版荷载取值误差大,影响隧道衬砌施工质量的问题,对隧道浇注过程二衬台车模版荷载取值进行研究。【方法】提出了一种考虑混凝土随时间硬化特性的侧向模版荷载计算公式和一种基于局部注浆压力分布范围的顶部模版荷载计算方法,并基于临滕高速公路方山隧道建设工程,采用数值模拟和现场实测相结合的方法,对二衬台车在边墙和拱顶浇注过程中受力情况进行了分析及验证。【结果】边墙浇注过程中,混凝土硬化对侧向模版荷载的影响明显,提出的侧压力衰减系数使得模拟结果贴近实测值。拱顶浇注过程中,局部注浆压力横向和纵向的分布范围显著影响模板受力情况。对于方山隧道,横向上局部注浆压力主要集中在拱顶最后一个浇注工况范围内,纵向上分布在注浆口至台车边缘范围内,且压力自注浆口向外逐渐减小为零。此外,非对称浇注导致的偏压荷载显著增加台车变形,最大变形值达10.97 mm。台车最大应力集中在拱脚千斤、门架连接处和承重立柱的变截面处,最大应力值为585.8 MPa。【结论】提出的模版荷载计算方法使台车设计更符合隧道实际工况要求,从而提高隧道衬砌施工质量与安全性。
[Objective]The current methods for determining tunnel lining trolley formwork load often reference load calculation methods for building construction formwork,while the significant differences exist between tunnel secondary lining pouring and building construction concrete pouring.The study investigated the secondary lining trolley formwork load during tunnel pouring process,so as to address the large errors of current trolley formwork load,which affect the tunnel lining construction quality.[Method]A lateral formwork load calculation formula considering time-dependent concrete hardening characteristics was proposed;and a top formwork load calculation method based on local grouting pressure distribution ranges was proposed as well.The Fangshan tunnel on Linyi-Tengzhou expressway was taken for the study object.Combining numerical simulations with field measurements,the stress of secondary lining trolley during sidewall and vault pouring were analyzed and validated.[Result]The concrete hardening significantly influences lateral formwork loads during sidewall pouring.The proposed lateral pressure attenuation coefficient makes simulation results closer to measured values.During vault pouring,the transverse and longitudinal distribution ranges of local grouting pressure critically affect the formwork stress.In Fangshan tunnel,the transverse grouting pressure concentrates within the final pouring section of vault,while the longitudinal pressure decreases gradually from the grouting port to trolley edge.In addition,the asymmetric pouring induced biased loads make trolley deformation increasing to the maximum of 10.97 mm.The maximum stress(585.8 MPa)occurs at the jack bases,portal frame connections,and variable cross-sections of load-bearing columns.[Conclusion]The proposed load calculation methods improve alignment between trolley design and actual tunnel working conditions,enhancing the lining construction quality and safety.
作者
迟作强
宋仁杰
丁炜程
伍毅敏
孔强
CHI Zuoqiang;SONG Renjie;DING Weicheng;WU Yimin;KONG Qiang(Shandong Luqiao Group Co.,Ltd.,Jinan,Shandong 250014,China;School of Civil Engineering,Central South University,Changsha,Hunan 410075,China)
出处
《公路交通科技》
北大核心
2025年第8期178-188,共11页
Journal of Highway and Transportation Research and Development
基金
山东省交通运输厅科技项目(2024B61-01)。
关键词
隧道工程
台车模版荷载
数值模拟
二衬台车
隧道衬砌
混凝土硬化
tunnel engineering
trolley formwork load
numerical simulation
secondary lining trolley
tunnel lining
concrete hardening
