摘要
针对在盾构输水隧洞管片衬砌中常采用的带衬垫的管片接头,建立了能够考虑接头混凝土榫槽、螺栓、弹性衬垫、止水衬垫等结构受力特性的三维精细化数值模型,研究带衬垫管片接头从开始承载至极限破坏全过程的承载性能。结果表明:带衬垫管片接头的承载性能十分复杂,在正弯矩工况下可以根据弹性衬垫开始张开、外缘混凝土开始接触、弹性衬垫完全张开3个关键点依次划分为4个阶段。在负弯矩工况下可以根据止水衬垫张开、弹性衬垫开始张开两个关键点依次划分为3个阶段。轴力对接头刚度的影响十分显著,但接头在不同轴力水平下的弯矩-转角曲线仍然符合在正负弯矩工况下的阶段特征。接头在弯矩作用下的极限状态通常是管片接头边缘混凝土先屈服,因此工程实践中需注意对该部位混凝土进行保护或者强化。
A detailed three-dimensional numerical model was established for the segment joints with gaskets commonly used in the segment lining of water conveyance tunnel constructed by shield tunneling machine,considering the stress of concrete mortise,bolt,elastic gasket,sealing gasket and other structures.Based on the models,the bearing performances of the segmental joint with gaskets from beginning bearing to ultimate failure were studied.The results indicated that the bearing performance of the segmental joint with gaskets is very complex.For the sagging moment case,the bearing performance can be divided into four stages by the three key points which are elastic gasket started to open,concrete at external edge started to contact and elastic gasket fully opened.For the hogging moment case,the bearing performance can be divided into three stages by two key points which were sealing gasket opened and elastic gasket started to open.The joint bending stiffnesses are significantly influenced by the axial forces,and the curves of the moment-rotations relationship with different axial forces still meet the basic law that can be divided into four stages in sagging moment case and three stages in hogging moment case.The joint ultimate states subject to the bending moments are commonly that the concrete at the edges of the segmental jointed yield firstly.Therefore,in engineering practice,it is necessary to protect or strengthen the concrete at these positions.
作者
秦敢
杨帆
陈锐
金典琦
QIN Gan;YANG Fan;CHEN Rui;JIN Dianqi(School of Civil and Environmental Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China;Shenzhen Urban Public Safety and Technology Institute,Shenzhen 518000,China;School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China)
出处
《人民长江》
北大核心
2023年第4期163-169,共7页
Yangtze River
基金
国家重点研发计划项目(2019YFC0810702)
中央高校基本科研业务费专项资金项目(JZ2022HGTA0335)。
关键词
盾构输水隧洞
管片接头
承载性能
衬垫
三维精细化数值模型
穿黄隧洞
water conveyance tunnel constructed by shield machine
segmental joint
bearing performance
gasket
detailed three-dimensional model
water conveyance tunnel crossing the Yellow River
