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小浪底排沙洞混凝土衬砌不同阶段预应力变化实测分析
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作者单位:

(1.天津大学建工学院;2.黄委会勘测设计研究院;3.小浪底建管局;)

作者简介:

亢景付

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中图分类号:

TU473.13

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Actual measurement and analysis of prestressed changes in the concrete lining of Xiaolangdi sand discharge tunnel at different stages
Author:
Affiliation:

(1.College of Construction and Engineering, Tianjin University;2. Huang Wei Survey and Design Research Institute;3. Xiaolangdi Construction Management Bureau;)

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    摘要:

    小浪底排沙洞是我国首例采用双圈环绕无粘结预应力混凝土衬砌的水工隧洞,本文对这一新型结构形式和特点进行了简单介绍,并根据观测仪器所获得的大量实测数据,对不同阶段(预应力施加、回填灌浆和过水运行)混凝土衬砌和锚索中的有效预应力变化及混凝土徐变变化规律进行了探讨。实测资料表明,采用双圈环绕无粘结预应力技术,可实现理想的预应力效果和均匀的环向应力分布。围岩开挖的质量对环向预应力分布的均匀性具有重要影响;对预应力施加需时较长的实际结构,混凝土的徐变应变在观测仪器的总应变变化中占有不容忽视的比例,其大小与预压应力和持荷时间成线性关系,可按??=?∑?iti进行计算。过水运行阶段的实测数据表明,该工程混凝土衬砌中所建立的预压应力足以抵抗最高设计运行水位下的内水压力而实现不裂不渗

    Abstract:

    Xiaolangdi sand exclusion cave is the first case of hydraulic tunnel lined with double-ring surrounded non-bonded prestressed concrete in China, this paper gives a brief introduction to this new structural form and characteristics, and according to a large number of measured data obtained by the observation instrument, it discusses the effective prestressing force changes in the concrete lining and anchors in the different phases (prestressing force application, backfill grouting and over-water operation) and the change rule of concrete creep. The measured data show that the double-ring encircling unbonded prestressing technique can realize ideal prestressing effect and uniform ring stress distribution. The quality of the surrounding rock excavation has an important influence on the uniformity of the ring prestress distribution; for the actual structure that takes a long time to apply prestressing, the creep strain of the concrete occupies a non-negligible proportion in the total strain change of the observation instrument, and its size and the pre-compressive stress and the holding time are linearly related to the pre-compressive stress and the holding time, and can be measured by? =? ∑?iti can be calculated. The measured data of the over-water operation stage show that the precompressive stress established in the concrete lining of the project is sufficient to resist the internal water pressure at the maximum design operation level without cracking or seepage.

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Kang Jingfu, Hu Yuming, Hou Xinhua Actual measurement and analysis of prestressed changes in the concrete lining of Xiaolangdi sand discharge tunnel at different stages. Prestress Technology 2006,10(02):10-15. 10.59238/j. pt.2006.02.002

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  • 在线发布日期: 2023-08-10
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