大型沉井下沉阻力分布特征及相关工程问题  

Sinking Resistance Distribution Characteristics of Large Open Caissons and Related Engineering Problems

作　　者：潘亚洲 王琛[1,2] 梁发云[1,2] PAN Yazhou;WANG Chen;LIANG Fayun(Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China;Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学岩土及地下工程教育部重点实验室,上海200092 [2]同济大学地下建筑与工程系,上海200092

出　　处：《结构工程师》2020年第6期134-143,共10页Structural Engineers

摘　　要：随着深水大跨度桥梁的迅猛发展,超大超深的沉井基础得到广泛应用,小型基础的相关经验与理论已不再适用,有必要明确现阶段的研究进展和研究成果,提炼沉井施工过程中尚需解决的关键性问题。已有研究表明,下沉阻力的变化或分布不均是引起沉井基础发生突沉、滞沉及偏沉等工程问题的直接原因,然而,目前对此类工程问题的研究尚停留在现象分析和预警补救的层面,缺乏理论方法的深入探索,对土层特性及固结条件等因素的考虑不足。本文归纳总结了大型沉井基础下沉阻力的分布特性和变化规律,进一步分析了沉井下沉期间由此引发的突沉、滞沉及偏沉等工程问题的内在机理,并探讨了大型沉井施工对周边环境的影响,为其施工技术及工程灾变机理研究提供参考。With the rapid development of deep-water and long-span bridges,large and deep open caisson foundations have been widely used.The relevant experience and theory of small foundations,however,are not suitable any more.It is necessary to clarify the current research,and refine the key problems during caisson construction.Previous studies have shown that the varied and uneven sinking resistance is the direct cause of the sudden sinking,stagnant sinking,and inclined sinking of caisson foundation.However,at present,research on such engineering problems is still at the level of phenomenon analysis and early warning and remedy,lacking of in-depth exploration of theoretical methods.In addition,the effects of soil properties and consolidation conditions are not well considered.This paper summarized the sinking resistance distribution characteristics and changing laws of large caisson foundation,and analyzed the internal mechanism of the engineering problems such as sudden sinking,stagnant sinking and inclined sinking during the sinking process of an open caisson,and discussed the influence of large caisson construction on the surrounding environment,to provide recommendations for the research and construction of large caisson foundation as well as the related engineering disaster mechanism.

关 键 词：大型沉井 下沉阻力 突沉 滞沉 偏沉 

分 类 号：TU753.64[建筑科学—建筑技术科学]