盐冻耦合侵蚀作用下寒旱地区渡槽劣化机制

doi:10.16265/j.cnki.issn 1003-3033.2020.11.007

中国安全科学学报 ›› 2020, Vol. 30 ›› Issue (11): 43-52.doi: 10.16265/j.cnki.issn 1003-3033.2020.11.007

盐冻耦合侵蚀作用下寒旱地区渡槽劣化机制

贡力^1,2 教授, 康春涛¹, 王鸿¹, 杨轶群¹, 王忠慧¹

1 兰州交通大学土木工程学院,甘肃兰州 730070;
2 兰州交通大学调水工程及输水安全研究所,甘肃兰州 730070

收稿日期:2020-08-31 修回日期:2020-10-11 出版日期:2020-11-28 发布日期:2021-07-15
作者简介:贡力 (1977—),男,江苏丹阳人,博士,教授,国家一级安全评价师,主要从事输水工程安全方面的研究。E-mail:gongl@mail.lzjtu.cn。
基金资助:
国家自然科学基金资助(51669010,51969011)。

Mechanism of aqueducts in cold and dry areas under effect of salt-frozen coupling erosion

GONG Li^1,2, KANG Chuntao¹, WANG Hong¹, YANG Yiqun¹, WANG Zhonghui¹

1 School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou Gansu 730070,China;
2 Institute of Water Diversion Engineering and Water Security, Lanzhou Jiaotong University, Lanzhou Gansu 730070, China

Received:2020-08-31 Revised:2020-10-11 Online:2020-11-28 Published:2021-07-15

摘要/Abstract

摘要： 为探究西北盐渍寒旱地区渡槽的服役性能,首先,运用顺序耦合热应力分析方式对渡槽槽身进行冻融循环有限元模拟分析;然后,开展基准、加防冻剂和加早强减水剂3种类型的混凝土试件在4种质量浓度的Na₂SO₄溶液侵蚀下的冻融循环试验。结果表明:有限元模拟中,随着冻融循环次数的增加,渡槽槽身的应力应变值也相应增大,且集中在渡槽槽身受冻区的交界处;试验中,混凝土试件的质量损失率和抗压强度损失率随着盐冻次数增加而增大,且试件的破坏程度也均逐渐加剧;在同种质量浓度盐溶液侵蚀下,不同类型试件的破坏程度由大到小依次为添加防冻剂组、基准组、添加早强减水剂组。盐冻作用会导致渡槽槽身产生破坏,长此以往则会造成渡槽结构的强度与稳定性下滑,影响输水工程的使用寿命。

关键词: 盐冻, 寒旱地区, 渡槽, 有限元模拟, 损失率

Abstract: In order to explore service performance of aqueduct in saline cold and arid areas of Northwest China, firstly, finite element simulation analysis of freezing and thawing cycle of aqueduct body was carried out using sequential coupled thermal stress analysis method. Then, freeze-thaw cycle tests were conducted on 3 types of concrete specimens, including reference, antifreeze and early strengthening water reducer, under erosion of Na₂SO₄ solutions at 4 mass concentrations. The results show that in finite element simulation, as number of freeze-thaw cycles increases, stress and strain values of aqueduct body also increase correspondingly which are mainly concentrated at junction of frozen areas. It is found through tests that quality loss rate and compressive strength loss rate of concrete specimens increase with rise in number of salt freezing, and their damage also gradually intensifies. Under erosion of salt solution at same mass concentration, damage degree of specimen ranks in descending order as antifreeze, reference and early strengthening water reducing agent group. Moreover, salt freezing will cause damage to aqueduct body, and in a long run, it will lead to decline of strength and stability of its structure, therefore affecting service life of water delivery project

Key words: salt freezing, cold and dry areas, aqueduct, finite element simulation, loss rate

中图分类号:

X935

贡力, 康春涛, 王鸿, 杨轶群, 王忠慧. 盐冻耦合侵蚀作用下寒旱地区渡槽劣化机制[J]. 中国安全科学学报, 2020, 30(11): 43-52.

GONG Li, KANG Chuntao, WANG Hong, YANG Yiqun, WANG Zhonghui. Mechanism of aqueducts in cold and dry areas under effect of salt-frozen coupling erosion[J]. China Safety Science Journal, 2020, 30(11): 43-52.

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盐冻耦合侵蚀作用下寒旱地区渡槽劣化机制

Mechanism of aqueducts in cold and dry areas under effect of salt-frozen coupling erosion

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