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隧道建设（中英文） ›› 2026, Vol. 46 ›› Issue (S1): 186-195.DOI: 10.3973/j.issn.2096-4498.2026.S1.016

• 研究与探索 • 上一篇    下一篇

盾构渣土资源化制备再生混凝土力学性能与破坏机制

张小燕1， 唐锦绎1， 李强2, 3, *， 孟令丰1， 李泓森1   

  1. (1. 中国矿业大学（北京）力学与土木工程学院， 北京 100083; 2. 深圳大学土木与交通工程学院, 广东 深圳 518060; 3. 极端环境岩土和隧道工程智能建养全国重点实验室(深圳大学)， 广东 深圳 518060)
  • 出版日期:2026-06-30 发布日期:2026-06-30
  • 作者简介:张小燕（1986—），女，重庆人，2015年毕业于香港大学，岩土工程专业，博士，副教授，现从事岩土工程研究工作。E-mail： zhangxiaoyan@cumtb.edu.cn。 *通信作者： 李强， E-mail： parkli@szu.edu.cn。

Mechanical Properties and Failure Mechanism of Recycled Concrete Prepared From Shield Tunnel Muck

ZHANG Xiaoyan1, TANG Jinyi1, LI Qiang2, 3, *, MENG Lingfeng1, LI Hongsen1   

  1. (1. School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China; 2. College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, Guangdong, China; 3. National Key Laboratory of Intelligent Maintenance and Construction for Extreme Environment Rock Soil and Tunnel Engineering, Shenzhen University, Shenzhen 518060, Guangdong, China)
  • Online:2026-06-30 Published:2026-06-30

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摘要： 为提升盾构渣土的资源化利用率，改善再生混凝土的力学性能并研究其破坏机制，设计无粗骨料（NCS）、单粒径（1C10）、双粒径（2C15）和级配良好（3C20）4组混凝土，通过单轴压缩试验与数字图像相关（DIC）技术，分析28 d与56 d龄期下的强度发展与破坏机制。结果表明： 1）NCS组28 d抗压强度为54.19 MPa，满足C50设计强度要求，但56 d强度发展有限，裂缝宽度最大，表现出明显的脆性破坏特征； 2）1C10组56 d抗压强度最高（79.76 MPa），裂缝扩展曲折，呈多裂缝韧性破坏； 3）2C15组压缩韧性指数最优，表现出良好的韧性与能量吸收能力； 4）3C20组强度显著退化（43.30 MPa），未达到设计强度，裂缝贯通骨料，破坏呈明显脆性。虽然NCS组能满足基本强度要求，但采用单粒径或双粒径级配可有效优化裂缝路径与破坏模式，推荐在实际应用中控制骨料最大粒径不超过15 mm，以保障盾构渣土混凝土的强度与耐久性要求。

关键词: 盾构渣土, 资源化利用, 骨料级配, 力学性能, 破坏机制, 数字图像相关技术

Abstract: To enhance the resource utilization of shield tunnel muck and improve the mechanical properties of recycled concrete while investigating its failure mechanism, four concrete mix proportions—no coarse aggregate (NCS), single-sized aggregate (1C10), double-sized aggregate (2C15), and well-graded aggregate (3C20)—are designed. Uniaxial compression tests and digital image correlation (DIC) techniques are employed to analyze the strength development and failure mechanisms at 28-day and 56-day curing ages. The results show the following: (1) The NCS group achieves a 28-day compressive strength of 54.19 MPa, meeting the C50 design strength requirement. However, its 56-day strength development is limited, exhibiting the largest crack width and significant brittle failure characteristics. (2) The 1C10 group achieves the highest 56-day compressive strength (79.76 MPa), with tortuous crack propagation and a multi-crack ductile failure mode. (3) The 2C15 group demonstrates the optimal compressive toughness index, indicating excellent toughness and energy absorption capacity. (4) The 3C20 group shows significant strength regression (43.30 MPa), failing to meet the design strength requirement, with cracks penetrating aggregates and exhibiting obvious brittle failure. While the NCS group meets the basic strength requirement, but single-sized or double-sized aggregate gradations can effectively optimize crack paths and failure modes. It is recommended to control the maximum aggregate size not exceeding 15 mm in practical applications to ensure the strength and durability requirements of concrete made from shield muck.

Key words: shield muck, resource recovery, aggregate gradation, mechanical properties, failure mechanism, digital image correlation

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