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Actual measurement and analysis of prestressed changes in the concrete lining of Xiaolangdi sand discharge tunnel at different stages
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(1.College of Construction and Engineering, Tianjin University;2. Huang Wei Survey and Design Research Institute;3. Xiaolangdi Construction Management Bureau;)

Clc Number:

TU473.13

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    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.

    Reference
    [1]林秀山等.小浪底工程后张法无粘结预应力隧洞衬砌技术研究与实践IM1郑州:黄河水利出版社1999
    [2]俞祥荣等.双圈环绕无粘结预应力混凝土衬砌施工技术[M1北京:中国水利水电出版社2000
    [3]张士锋.现代混凝土基础理论[M1.上海:同济大学出版社1994
    [4]徐芝纶弹性力学[M1北京:高等教育出版社1982
    [5]李国平预应力混凝结构设计原理[M北京:人民交通出版社,2000
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引用本文

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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  • Online: August 10,2023