基于正交试验的缺陷钢筋混凝土管道承载性能研究
Study on bearing capacity of defective reinforced concrete pipeline based on orthogonal test
刘俊博 1刘赫 1王志钢 2王伟 3曾正 4朱子豪 4梅哲 4邰宇峰1
作者信息
- 1. 国网吉林省电力有限公司电力科学研究院,长春 130012
- 2. 国网吉林省电力有限公司辽源供电公司,辽源 136200
- 3. 国网吉林省电力有限公司,长春 130022
- 4. 中国地质大学 (武汉)工程学院,武汉 430070
- 折叠
摘要
在电力隧道服役过程中由于复杂地质条件的影响,容易出现变形、裂缝、腐蚀等结构病害,为保证电缆隧道的安全运行需要研究不同结构病害对电缆隧道承载性能的影响以评估隧道运行健康状态.采用带缺陷钢筋混凝土管道进行三边荷载正交模型试验,将管顶竖向位移、管道开裂荷载和极限荷载作为管道承载性能评价指标,通过分析不同因素水平条件下管道承载性能评价指标的极差和方差,得到了裂缝深度、钢筋腐蚀劣化程度和混凝土劣化程度对管道承载性能指标影响的显著性.结果表明:钢筋腐蚀劣化后塑性减弱是导致钢筋混凝土管道塑性变形能力减弱的主要原因;裂缝发展导致截面面积降低是导致管道开裂状态承载能力减弱的主要原因;混凝土腐蚀劣化后强度降低是导致管道极限承载性能减弱的主要原因.
Abstract
Due to the influence of complex geological conditions during the service of power tunnels,structural diseases such as deformation,cracks and corrosion are prone to occur.In order to ensure the safe operation of cable tunnels,it is necessary to study the influence of different structural diseases on the bearing capacity of cable tunnels to evaluate the health status of tunnel operation.The trilateral load orthogonal model test of defective reinforced concrete pipeline was carried out.The vertical displacement of the pipe top,the cracking load and the ultimate load of the pipeline were taken as the evaluation indexes of the bearing capacity of the pipeline.By analyzing the range and variance of the evaluation indexes of the bearing capacity of the pipeline under different factors and levels,the significance of the influence of crack depth,corrosion deterioration degree of steel bar and concrete deterioration degree on the bearing capacity index of the pipeline was obtained.The results show that the main reason for the decrease of plastic deformation capacity of reinforced concrete pipeline is the decrease of plasticity after corrosion degradation of steel bar.The decrease of cross-sectional area caused by crack development is the main reason for the decrease of bearing capacity of pipeline cracking state.The strength reduction of concrete after corrosion degradation is the main reason for the weakening of the ultimate bearing capacity of the pipeline.
关键词
钢筋混凝土管道/管道缺陷/承载性能/正交试验Key words
reinforced concrete pipeline/pipe defect/bearing capacity/orthogonal test引用本文复制引用
基金项目
国家电网总部科技项目(5200-202029144A-0-0-00)
出版年
2024
NETL
NSTL
维普
万方数据