| 引用本文: | 刘 伟,邹春霞,李红云,等.冻融-风沙吹蚀对渠道衬砌混凝土损伤的加速劣化机制[J].灌溉排水学报,2023,42(12):132-139. |
| LIU Wei,ZOU Chunxia,LI Hongyun,et al.冻融-风沙吹蚀对渠道衬砌混凝土损伤的加速劣化机制[J].灌溉排水学报,2023,42(12):132-139. |
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| 摘要: |
| 【目的】探究北方水工渠道混凝土衬砌在冻融-风沙吹蚀不利环境的损伤破坏机制。【方法】利用内蒙古地区固体废弃物粉煤灰和硅粉配制满足渠系工程要求的混凝土试样，研究不同铺设方位渠道混凝土衬砌的抗冻融-风沙吹蚀损伤特征及对其使用寿命的影响。【结果】①风沙吹蚀加速了北方寒区混凝土衬砌的冻融损伤破坏，渠道混凝土表面浆体剥蚀程度随吹蚀角增大而加剧，90°吹蚀角风沙吹蚀时混凝土表面损伤最严重，加速了表面浆体脱落和内部损伤，对混凝土内部产生的损伤是30°吹蚀角的2倍；②吹蚀面劣化程度表现出明显的分形特征，冻融-风沙吹蚀耦合作用使内部小孔隙向大孔隙演变；③基于物质衰变理论与灰色理论，建立了相对动弹性模量的GM（1,1）灰色预测模型和不同角度风沙吹蚀下混凝土冻融循环损伤的寿命预测模型。【结论】水工混凝土衬砌服役寿命随吹蚀角增加而减小，90°吹蚀角作用下服役寿命缩短为25.83 a。 |
| 关键词: 渠道混凝土；冻融循环；风沙吹蚀；吹蚀角；分形维数；服役寿命 |
| DOI：10.13522/j.cnki.ggps.2023243 |
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| Unveiling the Mechanisms Underlying the Accelerated Channel Lining Concrete Damage Caused by Freeze-Thaw-Wind-Sand Erosion |
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LIU Wei, ZOU Chunxia, LI Hongyun, HUANG Kun, GUO Xiaosong, SONG Yuxin
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1. Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, China;
2. Ordos Housing and Urban Rural Development Bureau of Dalad Banner, Ordos 017300, China;
3. Xi’an HaiTang Vocational College, Xi’an 710038, China
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| Abstract: |
| 【Objective】This study delves into the mechanisms underlying the damage and failure of concrete linings in hydraulic channels in cold regions in Northern China that are prone to freeze-thaw, wind and sand erosion.【Method】We prepared concrete samples, in line with canal system engineering standards, using solid waste fly ash and silicon powder sourced from Inner Mongolia. Our investigation focused on the freeze-thaw-wind-sand erosion of the concrete lining when it is laid in different directions and the consequential impact on its service life.【Result】①Wind-sand erosion exacerbates freeze-thaw damage in the concrete lining within. The extent of slurry erosion on the channel concrete surface intensifies with the increase in erosion angle. The most severe surface damage occurs when the wind-sand erosion angle was 90°, accelerating surface slurry shedding and internal damage, which is twice as severe as when the angle was 30°. ②The degradation of the eroded surface showed a distinctive fractal pattern. The combined effects of freeze-thaw-wind-sand erosion initiated small pores which then propagated to larger pores. ③Based on material decay and grey theory, we proposed an GM (1,1) grey model to predict the relative dynamic elastic modulus and a model to predict of serve life of the concrete under cycled freeze-thaw erosion under various wind-sand erosion angles.【Conclusion】The service life of the hydraulic concrete lining diminishes as the wind-sand erosion angle increases, with a substantial reduction to 25.83 years when exposed to 90° wind-sand erosion. |
| Key words: channel concrete; freezing-thawing; wind erosion; blowing angle; fractal dimension; service life |
