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| 装配式配筋UHPC内衬管环力学性能试验研究 |
| Experimental Study on Mechanical Properties of Prefabricated Reinforced UHPC Lining Pipes |
| 投稿时间：2025-07-23 修订日期：2026-02-14 |
| DOI： |
| 中文关键词: 地下管道 非开挖修复 装配式UHPC管片 铁基形状记忆合金 自预应力 |
| 英文关键词: Underground pipes Trenchless rehabilitation Prefabricated UHPC segments Iron-based shape memory alloys self-prestressing |
| 基金项目: |
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| 中文摘要: |
| 为应对大直径地下管道结构性病害非开挖修复中内衬层厚度与修复效果难以兼顾的问题，本文提出了一种配筋增强超高性能混凝土（Ultra-high performance concrete, UHPC）装配式内衬管环。并创新性地采用铁基形状记忆合金（Iron-based shape memory alloy, Fe-SMA）筋在薄壁曲面管片中引入自预应力，以期在不增加壁厚的情况下提高管片性能。通过三边加载试验，对不同混凝土类型、配筋形式、配筋率及有无预应力状态下管环的受力特性进行了对比分析，揭示了弯矩分布规律与裂缝发展特征。结果表明：管环最大弯矩出现在管顶与管底，其次为起拱线位置，管肩与管腰处弯矩较小，最终呈现塑性铰破坏模式，装配节点区域未成为薄弱部位。与未激活Fe-SMA自预应力试件相比，激活自预应力后管环的开裂荷载与裂缝宽度达0.2 mm时对应荷载分别提高44.4%和35.6%。Fe-SMA筋引入的自预应力可有效提升薄壁UHPC管环的抗裂性能。研究成果可为薄壁UHPC内衬结构的设计优化与工程应用提供参考依据。 |
| 英文摘要: |
| To address the conflict between lining thickness and repair effect in trenchless rehabilitation of large-diameter pipelines with structural damage, this study proposes a reinforced ultra-high-performance concrete (UHPC) prefabricated lining pipe ring. Innovatively, iron-based shape memory alloy (Fe-SMA) rebars were incorporated to introduce self-prestress in the thin-walled curved segments, thereby enhancing their structural performance without increasing wall thickness. Three-edge bearing tests were conducted to comparatively evaluate the effects of concrete type, reinforcement scheme, reinforcement ratio, and prestress activation state on the structural performance. The bending moment distribution and crack propagation characteristics were systematically analyzed. The results indicate that the maximum bending moments occur at the crown and invert of the pipe ring, followed by the springline, while the shoulder and haunch exhibit relatively lower bending moments. The failure mode is governed by plastic hinge formation, and no premature damage initiates at the assembly joints. Compared with specimens without prestress activation, the cracking load and the load corresponding to a crack width of 0.2 mm increase by 44.4% and 35.6%, respectively, after activating the Fe-SMA rebar. The self-prestressing effect significantly enhances crack resistance of the pipe ring. The findings provide a reference for the design optimization and engineering application of thin-walled UHPC lining structures. |
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