沉管管节沉放系缆力试验的研究.pdf

武汉理工大学硕士学位论文摘要沉管隧道作为一种特殊的跨海越江工程,由于其独特的优势,正逐渐广泛被采用,并日益成为交通运输系统中的一个重要的环节。在沉管隧道施工过程中,管节沉放的施工是重点和难点。一方面,管节沉放过程涉及沉放驳船、待沉管节与系泊缆绳等,是一个非常复杂的体系;另一方面,管节沉放过程受到风、浪、流等多种江海环境因素的综合影响。因此,研究沉管管节沉放过程中浮驳与管节系泊缆绳的受力特性,有利于预报管节沉放过程的危险情况,为实际沉放施工提供参考。本文重点从模型试验角度对沉管隧道管节沉放状态下的系泊定位缆绳进行受力特性分析。全文工作围绕管节沉放过程的物理模型试验展开:首先,对系泊系统的单绳悬链模型和缆绳系统模型分别进行静力计算分析;然后,依据理论推导结果,对系泊缆绳进行相似模拟设计和物理模型调配,并对制作的物理模型系泊缆与实际系泊缆绳的力学特性进行了对比,验证了物理模型的可靠性; 再将模型缆绳应用于沉管管节沉放物理模型试验,分析了试验中水流、波浪、负浮力和沉放深度等因素对系泊缆绳张力特性的影响;最后,根据试验分析结果,得到沉放过程系泊缆绳张力特性的相关结论,并对实际管节沉放施工中可能出现危险的情况提出建议。关键词:沉管隧道;系泊沉放;缆绳张力;模型制作;模型试验武汉理工大学硕士学位论文 Abstract As anew and special type ofengineering across river orsea,immersed tube tunnel hasbeenwidely adopted intransportationsystem all over of themost important and difficultprocedures on immersed tube construction iS immersion only theimmersing process plex which involvesfloatingbarges,tube elementandmooting cables,but alsothebarges and immersedtube element have been affectedbywind,water flow,wave andmany other marine environment theforcecharacteristics ofmooring cablesandthemotion of tubeelementwill behelpful forforecasting thedangerous situationandguiding theconstruction. Thisexperimental study iSconducted on theimmersion emphasis of theinvestigation is on thetension characteristics ofmooring cables. First,the haracteristicsof asingle cableandmooring cables system are ,the physical model ofmooring similarity and reliability of thephysical models are that,the cable models ale usedinmodel testof tHaneltube immersion affection of wind,water flow,wave,negative buoyancy oftube,sinking depth on thetension characteristicsofmooring system totheresultandanalysis, some proposals aboutthe immersion process are offered. KeyWords:ImmersedTunnel;MooringSystem;Model Test ofImmersion;Tension Characteristic;Mooring CableModel ,陆路交通已经形成了一个完整而成熟的