外力作用下夹江盾构隧道纵向沉降特征及其影响分析  

Analysis on Characteristics and Influence of Longitudinal Settlement of Jiajiang Shield Tunnel Under External Force

作　　者：华晓晔 周全 丁鸿志 Hua Xiao-ye;Zhou Quan;Ding Hong-zhi

机构地区：[1]南京市公共工程建设中心,南京210019

出　　处：《建筑技术开发》2021年第17期112-114,共3页Building Technology Development

摘　　要：岸边堆载、河床冲淤及潮汐荷载等因素将导致水下隧道建成后继续出现沉降,差异沉降过大时将给运营安全带来一定威胁。针对刚建成通车的南京夹江隧道,通过隧道结构纵向受力特性模拟,分析了陆域段堆土、江中河床冲刷和水位变化工况下结构的纵向沉降特性,讨论了典型区段的差异沉降分布规律及其对接头受力、防水影响,用于评估运营安全状态。分析表明,在保证管片预制和拼装质量的前提下,运营期堆载、冲淤、潮汐变化不会降低结构的纵向承载及防水性能。Factors such as shore loading,riverbed erosion and siltation,and tidal loads will cause underwater tunnel to continue to settle after its completion.If the differential settlement is too large,it will pose a certain threat to operational safety.Aiming at the Nanjing Jiajiang Tunnel,which has just been opened to traffic,through simulation of longitudinal force characteristics of the tunnel structure,longitudinal settlement characteristics of the structure under the conditions of soil piling,river bed erosion and water level changes in the land section are analyzed,and the differences in the typical sections are discussed.The distribution law of settlement and its influence on force and waterproof performance of joints are used to guide assessment of operational safety status.The analysis shows that under the premise of ensuring quality of segment prefabrication and assembly,stacking,scouring and silting,and tidal changes during the operation period will not reduce longitudinal load-bearing and waterproof performance of the structure.

关 键 词：水下盾构隧道 纵向差异沉降 曲率半径 螺栓应力 

分 类 号：U457.4[建筑科学—桥梁与隧道工程]