疲劳-腐蚀耦合作用下岩土预应力锚固结构的力学特性和耐久性研究

IF 1.5 Q3 MECHANICS
Ming Li
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引用次数: 0

摘要

本文介绍了一种包含室内实验、理论分析和数值模拟的综合方法,用于研究承受疲劳荷载和腐蚀的预应力锚固结构的耐久性。该研究解决了累积荷载和腐蚀造成的逐渐老化和损坏这一关键问题,最终导致结构耐久性下降。通过严格分析疲劳载荷和腐蚀对钢筋性能的影响,进行了数值模拟,以阐明内部锚固部分的失效机制和变化规律。在对钢筋进行一定时间的疲劳和腐蚀试验后,对其进行系统分类,并在不同的酸性和碱性环境中对其进行不同的疲劳拉伸循环试验。利用 PFC2D 程序,开发了疲劳载荷、腐蚀和疲劳载荷耦合效应下的预应力锚固结构数值模型。该模型对两种不同条件下螺栓-灌浆界面的剪应力、轴向应力和位移场的演变进行了对比分析。研究结果揭示了在疲劳载荷和腐蚀的协同作用下,螺栓-灌浆界面粘接降解的微观机制。提出的方法和实验结果表明,岩土锚固技术可以有效加固 70% 的岩土结构,显著减少约 80% 的土壤流失。这项研究为预应力锚固结构的耐久性提供了宝贵的见解,为未来的改进和优化铺平了道路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study on Mechanical Characteristics and Durability of Prestressed Anchorage Structure of Rock and Soil under Fatigue-Corrosion Coupling Action
This paper presents a comprehensive approach encompassing indoor experiments, theoretical analysis, and numerical simulations to investigate the durability of prestressed anchorage structures subjected to fatigue loads and corrosion. The study addresses the critical issue of gradual aging and damage caused by cumulative loads and corrosion, which ultimately leads to a decrement in structural durability. Through a rigorous analysis of the effects of fatigue load and corrosion on the performance of steel bars, numerical simulations were conducted to elucidate the failure mechanisms and variation patterns within the internal anchoring section. After subjecting steel bars to fatigue and corrosion tests for a defined duration, they were systematically categorized and exposed to varying fatigue tensile cycles in diverse acidic and alkaline environments. Employing the PFC2D program, a numerical model of the prestressed anchorage structure under the coupled effects of fatigue load, corrosion, and fatigue load was developed. This model allowed for a comparative analysis of the evolution of shear stress, axial stress, and displacement fields at the bolt-grout interface under two distinct conditions. The findings reveal the microscopic mechanisms underlying bond degradation at the bolt-grout interface under the synergistic impact of fatigue load and corrosion. The proposed methodology and experimental results demonstrate that geotechnical anchoring technology can effectively reinforce up to 70% of geotechnical structures, significantly reducing soil loss by approximately 80%. This research provides valuable insights into the durability of prestressed anchorage structures, paving the way for future improvements and optimizations.
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CiteScore
1.70
自引率
8.30%
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