李慧媛,李海枫,李炳奇,张振宇,刘小楠,黄涛

• 1:南水北调中线工程建设管理局河北分局
• 2:中国水利水电科学研究院结构材料研究所

摘要(Abstract)：

多厢互联式渡槽是针对南水北调输水量大而专门提出的一种新型渡槽结构型式,与传统单厢渡槽相比,这种新型渡槽纵向与横向尺寸相差不大,并采用三向预应力设计,导致其横向刚度与纵向刚度相差不大,承载以后的受力表现更像板而不是梁,这种结构挠度变形很小,但对不均匀沉降变形异常敏感。为此,以某三厢互联预应力渡槽为例,通过对现有沉降变形监测资料进行分析,提出了两种不同类型不均匀沉降变形模式,即"一头倒"和"扭麻花"沉降变形模式,并指出实际不均匀沉降是上述两种的复合模式。同时,当不均匀沉降发生时,将会改变槽身受力状态,对渡槽安全运行产生不利影响;随着不均匀沉降变形增大,槽身内壁及外壁应力状态逐渐恶化,内壁受拉区范围逐渐增大,最大拉应力值也逐渐增大;该不均匀沉降变形达到当前状态的1.5倍时,槽身内壁环向正应力将超过1.70 MPa,内壁存在很大的开裂风险。

关键词(KeyWords)： 多厢互联预应力渡槽;不均匀沉降;沉降模式;安全评估

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划项目(2016YFC0401807)

作者(Author): 李慧媛,李海枫,李炳奇,张振宇,刘小楠,黄涛

DOI: 10.13928/j.cnki.wrahe.2021.03.006

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