陡峻河谷高面板坝坝体与坝基接触效应

doi:10.16285/j.rsm.2017.2199

›› 2018, Vol. 39 ›› Issue (9): 3415-3424.doi: 10.16285/j.rsm.2017.2199

陡峻河谷高面板坝坝体与坝基接触效应

魏匡民^{1, 2}，陈生水^{1, 2}，李国英^{1, 2}，吴俊杰^{1, 3}

1. 南京水利科学研究院岩土工程研究所，江苏南京 210024；2. 南京水利科学研究院水利部土石坝破坏机理与防控技术重点实验室，江苏南京 210029；3. 新疆水利水电勘测设计研究院，新疆乌鲁木齐 830000

收稿日期:2017-11-02 出版日期:2018-09-11 发布日期:2018-10-08
作者简介:魏匡民，男，1985年生，博士，高级工程师，主要从事岩土工程数值分析和本构模型方面的研究
基金资助:
国家重点研发计划重点专项（No.2017YFC0404904）；国家自然科学基金项目（No.51509163，No.U1765203）；中央级公益性科研院所基本科研业务费（No.Y317004）；水利部公益性行业专项经费项目（No.201501035）。

Influence of contact effect between dam body and dam foundation on behaviours of high concrete faced rockfill dam built in steep valleys

WEI Kuang-min ^{1, 2}, CHEN Sheng-shui^{1, 2}, LI Guo-ying^{1, 2}, WU Jun-jie^{1, 3}

1. Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing, Jiangsu 210024, China; 2. Key Laboratory of Failure Mechanism and Safety Control Techniques of Earth-Rock Dam of the Ministry of Water Resources, Nanjing Hydraulic Research Institute, Nanjing, Jiangsu 210029, China; 3. Xinjiang Water Conservancy and Hydropower Survey Design Institute, Urumqi, Xinjiang 830000, China)

Received:2017-11-02 Online:2018-09-11 Published:2018-10-08
Supported by:
This work was supported by the National Key R & D Plan (2017YFC0404904), the National Natural Science Foundation of China (51509163, U1765203) , the Basic Scientific Research Funds in National Nonprofit Institutes (Y317004) and the Financial Support from the Chinese Ministry of Water Resource ( 201501035).

摘要/Abstract

摘要： 以新疆大石峡250 m级特高面板砂砾石坝为依托工程，采用大型接触面直剪试验确定了筑坝料与基岩的摩擦接触参数，建立了考虑坝体与坝基相互接触作用的面板坝三维数值模型，研究了摩擦接触效应对坝体、混凝土面板应力变形以及止水接缝三向变位的影响。结果表明：双曲线模型符合筑坝料与基岩之间剪应力与位移的非线性关系；若不考虑坝体与基岩的接触效应，坝体边界处变形梯度和主应力值计算值均偏小，导致判断该区域坝体开裂区范围偏小而拱效应被高估；蓄水期面板挠度和顺坡向应力受接触效应影响相对较小，而轴向位移和轴向应力受接触效应影响较大；周边缝变位受接触效应影响非常强烈，在高水头压力作用下，坝体局部可能出现相对基岩的滑移导致周边止水变形和坝肩竖缝张开量大幅增加。陡峻河谷筑坝若不考虑接触效应，计算结果是偏危险的。计算结果和Anchicaya 坝实测渗漏位置结果均表明，周边缝变位控制是陡峻河谷面板坝建设的关键。

关键词: 陡峻河谷, 面板坝, 摩擦接触, 直剪试验, 有限元

Abstract: In this study, based on the 250 m grade concrete face gravel dam of Dashixia in Xinjiang province, large-scale direct shear tests were conducted to determine friction parameters of the interface, and numerical model considering the contact effect was established. The influence of contact effect on stress and deformation of the dam body, concrete slab, and water stops were studied. Results show that the hyperbolic model can meet the non-linear relationship of the shear stress and the displacement of the interface. If the contact effect is not taken into account, the deformation gradient and the principal stress value of the dam body become low, and the arch effect would be overestimated. The deflection and the slope direction stress of slab are less affected by the contact effect, while the axial displacement and the axial stress are greatly influenced. The deformation of the peripheral joint is strongly affected by the contact effect. Under the high-water pressure, the local dam body slip may occur, which may lead to an increase of the peripheral and vertical joint deformation. The results of this study and in-situ observations of Anchicaya dam reveal that the control of peripheral joint deformation is the key point in constructing concrete-faced rockfill dams in steep valleys.

Key words: steep valley, concrete-faced rockfill dam, friction contact, direct shear test, finite element

中图分类号:

TV 223

魏匡民，陈生水，李国英，吴俊杰, . 陡峻河谷高面板坝坝体与坝基接触效应[J]. , 2018, 39(9): 3415-3424.

WEI Kuang-min , CHEN Sheng-shui, LI Guo-ying, WU Jun-jie, . Influence of contact effect between dam body and dam foundation on behaviours of high concrete faced rockfill dam built in steep valleys[J]. , 2018, 39(9): 3415-3424.

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陡峻河谷高面板坝坝体与坝基接触效应

Influence of contact effect between dam body and dam foundation on behaviours of high concrete faced rockfill dam built in steep valleys

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