Prediction of Durability Ultimate Life of Cantilever Anti-slide Pile Under Simulated Acid Rain Erosion Environment
JIN Honghua1,2, REN Qingyang1,2,*, XIAO Songqiang1,2, REN Xiaokun1,2
1 State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074, China 2 School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
Abstract: In order to construct the durability limit life criterion and service life prediction model of cantilever anti-slide piles under the coupling action of long-term load and acid rain erosion, a multi-factor time history evolution model of concrete neutralization depth was constructed by carrying out concrete neutralization test under acid rain alone erosion, the coupling action of bending load and acid rain erosion. Secondly, the initial rust time model of cantilever anti-slide pile reinforcement was established by modifying the calculation model of neutralization residue of concrete. Combined with the existing corrosion rate model of reinforcement, the durability limit life criterion and service life prediction model of cantilever anti-slide pile were constructed. Finally, based on the control variable method, the parametric study of cantilever anti-slide pile was carried out, including the pile material, pile construction, external environment and external load. Results indicated that the neutralization depth of concrete under the coupling action of bending load and acid rain erosion is positively correlated with erosion time, stress level and the acidity of simulated acid solution. The time-varying evolution of neutralization depth of concrete conforms to the three-stage model. The predicted values obtained by the durability limit life prediction model of the cantilever anti-slide pile in this work are 17.52 a and 12.47 a longer than those obtained by the original model, the established model has good applicability, and the predicted results are more economical and reasonable and conform to the enginee-ring practice. The service life of the cantilever anti-slide pile is directly proportional to the thickness of the concrete protective layer, the concrete strength, the construction quality and the pH value of the external erosion solution of the cantilever anti-slide pile, and inversely proportional to the water-cement ratio of the concrete and the stress level at the sliding surface of the cantilever anti-slide pile. The research results have important scientific guiding significance and practical value for the service life evaluation of cantilever anti-slide pile under acid rain erosion.
1 Zhou Y, Zheng S S, Chen L Z, et al. Journal of Building Engineering, 2021, 44, 1. 2 Hadigheh S A, Ke F H, Kashi S. Construction and Building Materials, 2020, 261, 1. 3 Yao J W, Chen J K, Lu C S. Construction and Building Materials, 2019, 209, 492. 4 Wang K, Lin J, Ge C C, et al. Bulletin of the Chinese Silicate Society, 2018, 37(1), 173(in Chinese). 王凯, 林静, 葛翠翠, 等. 硅酸盐通报, 2018, 37(1), 173. 5 Fan Y F, Hu Z Q, Luan H Y, et al. Structural Engineering & Mecha-nics, 2014, 52(1), 35. 6 Gu H, Li Q W, Hou G J. Engineering Mechanics, 2021, 38(5), 113(in Chinese). 谷慧, 李全旺, 侯冠杰. 工程力学, 2021, 38(5), 113. 7 Wang C T, Wang H, Qin W M, et al. Bulletin of Engineering Geology and the Environment, 2021, 80(10), 7507. 8 Li J P, Xie F, Li L, et al. Journal of Harbin Institute of Technology, 2019, 51(6), 89(in Chinese). 李镜培, 谢峰, 李亮, 等. 哈尔滨工业大学学报, 2019, 51(6), 89. 9 Yi L Y, Tang H M, Chen H K. The Chinese Journal of Geological Hazard and Control, 2009, 20(3), 94(in Chinese). 易丽云, 唐红梅, 陈洪凯. 中国地质灾害与防治学报, 2009, 20(3), 94. 10 Huang X P. Study on durability of anti-slide pile in the erosive environment with acid rain. Master's Thesis, Chongqing University, China, 2013(in Chinese). 黄新朋. 酸雨侵蚀性环境下抗滑桩耐久性研究. 硕士学位论文, 重庆大学, 2013. 11 Ministry of Housing and Urban-Rural Construction of the People's Republic of China. Specification for mix proportion design of ordinary concrete(JGJ 55-2011), China Construction Industry Press, China, 2011(in Chinese). 中华人民共和国住房和城乡建设部. 普通混凝土配合比设计规程(JGJ 55-2011), 中国建筑工业出版社, 2011. 12 Wang Y, Niu D T, Song Z P. Materials Reports, 2014, 28(12), 120(in Chinese). 王艳, 牛荻涛, 宋占平. 材料导报, 2014, 28(12), 120. 13 Cao C, Zheng S S, Hu W B. Materials Reports, 2019, 33(11), 1869(in Chinese). 曹琛, 郑山锁, 胡卫兵. 材料导报, 2019, 33(11), 1869. 14 Gao M Z, Gan W Z. Building Structure, 2012, 42(7), 84(in Chinese). 高明赞, 干伟忠. 建筑结构, 2012, 42(7), 84. 15 Ministry of Housing and Urban-Rural Development of the People's Republic of China. Durability assessment standard for existing concrete structures(GB/T 51355-2019), China Construction Industry Press, China, 2019(in Chinese). 中华人民共和国住房和城乡建设部. 既有混凝土结构耐久性评定标准(GB/T 51355-2019), 中国建筑工业出版社, 2019. 16 Kim A T V, Mark G S. Building Technique Development, 2007, 22(4), 313. 17 Li C Q. Journal of Structural Engineering, 2004, 130(10), 1570. 18 Ministry of Construction of the People's Republic of China. Specification for geotechnical engineering investigation(GB 50021-2001), China Construction Industry Press, China, 2002(in Chinese). 中华人民共和国建设部. 岩土工程勘察规范(GB 50021-2001), 中国建筑工业出版社, 2002. 19 Ministry of Housing and Urban and Rural Construction of the People's Republic of China. Durability design standards for concrete structures(GB/T 50476-2019), China Construction Industry Press, China, 2019(in Chinese). 中华人民共和国住房和城乡建设部. 混凝土结构耐久性设计标准(GB/T 50476- 2019), 中国建筑工业出版社, 2019.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2024, Vol. 38 
