模拟酸雨侵蚀环境下悬臂抗滑桩耐久性极限寿命预测

doi:10.11896/cldb.22070148

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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.

Key words： cantilever anti-slide pile bending load acid rain erosion environment neutralization depth durability ultimate life criterion service life prediction

Published: 10 March 2024 Online: 2024-03-18

CLC number:

P694

Fund:National Key Research and Development Program of China(2023YFC3008304-4), National Natural Science Foundation of China (U20A20314, 41472262, 52104184), the Key Project of Chongqing Natural Science Foundation (cstc2020jcyj-zdxmX0012), the Innovation Research Group of Universities in Chongqing(CXQT19021), the Chongqing Graduate Research Innovation Project (CYB21210), and the Special Support of Chongqing Postdoctoral Research Project(2021XM3038).

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	JIN Honghua
	REN Qingyang
	XIAO Songqiang
	REN Xiaokun

Cite this article:

JIN Honghua,REN Qingyang,XIAO Songqiang, et al. Prediction of Durability Ultimate Life of Cantilever Anti-slide Pile Under Simulated Acid Rain Erosion Environment[J]. Materials Reports, 2024, 38(5): 22070148-8.

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http://www.mater-rep.com/EN/10.11896/cldb.22070148 OR http://www.mater-rep.com/EN/Y2024/V38/I5/22070148

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