硅酸盐学报

海底隧道盾构管片混凝土断裂性能提升方法及微观机理

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石贺男 ¹^,² , 李化建 ¹^,² , 黄法礼 ¹^,² , 董昊良 ¹^,² , 李良顺 ¹^,²

硅酸盐学报 | 研究论文 2026,54(8): 2753-2764

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硅酸盐学报 |研究论文 2026 , 54 (8) : 2753 -2764

海底隧道盾构管片混凝土断裂性能提升方法及微观机理

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石贺男¹^,², 李化建¹^,², 黄法礼¹^,², 董昊良¹^,², 李良顺¹^,²

作者信息

^1．中国铁道科学研究院集团有限公司铁道建筑研究所，北京 100081

^2．高速铁路轨道系统全国重点实验室，北京 100081

通讯作者:

李化建（1976—），男，博士，研究员。

作者简介:

石贺男（1997—），男，博士研究生。

Methods for Enhancing Fracture Performance and Microscopic Mechanisms of Concrete in Subsea Tunnel Shield Segments

Henan SHI¹^,², Huajian LI¹^,², Fali HUANG¹^,², Haoliang DONG¹^,², Liangshun LI¹^,²

Affiliations

^1.Railway Engineering Research Institute, China Academy of Railway Science Corporation Limited, Beijing 100081, China

^2.State Key Laboratory of High Speed Railway Track System, Beijing 100081, China

Corresponding Author:

{LI} Huajian (1976-), male, Ph.D., Research Fellow. E-mail: chinasailor@163.com

SHI Henan (1997-), male, Doctoral candidate. E-mail: hnshicars@163.com

出版时间: 2025-12-16 doi: 10.14062/j.issn.0454-5648.20250820

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摘要

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在海底盾构隧道建设和服役阶段，盾构管片混凝土会出现开裂病害，影响隧道结构安全性和耐久性。本工作通过三点弯曲梁法和数字图像相关方法，研究了纳米SiO₂涂层、迁移型阻锈剂和纳米前驱体材料对盾构管片混凝土断裂韧性的提升作用机理，并通过背散射电子成像和纳米划痕方法分析了防护材料对混凝土界面过渡区（ITZ）的影响。结果表明：防护材料改善了混凝土断裂性能，起裂韧度提高了22.6%~48.9%，失稳韧度提高了18.8%~49.8%，断裂能提高了0.50~1.59倍。纳米前驱体材料对混凝土的变形能力提升效果最为明显，在峰值应力后30%阶段裂纹尖端张开位移值降低了31.8%~47.2%。其原因是防护材料改善了混凝土ITZ性能，ITZ厚度减小了6.5%~30.2%，平均孔隙率降低了14.1%~43.0%，微观断裂韧性提高了3.2%~19.4%。

关键词

海底隧道 / 盾构管片混凝土 / 断裂韧性 / 裂缝尖端张开位移 / 界面过渡区

Abstract

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Introduction

Subsea shield tunnels serve as critical passages connecting two sides of sea areas and play a vital role in supporting the development of a maritime nation and the coordinated integration of land and marine resources. In recent years, the construction of subsea shield tunnels has been rapidly developed, with representative projects including the Lion Rock Subsea Tunnel of the Guangzhou-Shenzhen-Hong Kong High-Speed Railway, the Qingdao Jiaozhou Bay Second Subsea Tunnel, and the Jintang Subsea Tunnel of the Ningbo-Zhoushan Railway, China. However, during both the construction and service phases of shield tunnels, some factors such as construction practices, aggressive environmental conditions, and uneven settlement can lead to cracking, water leakage, and even corrosion of reinforcement in segment concrete. Insufficient toughness and crack resistance of shield segment concrete can compromise the long-term operational safety of shield tunnels. During service, shield segments are subjected to high water pressure and strongly corrosive ionic environments. To enhance the durability of concrete, erosion-inhibiting materials like coatings, migrating corrosion inhibitors, and internally incorporated nanomaterials are often used during prefabrication. These materials significantly improve the durability of segment concrete, and their effect on crack resistance and toughness remains insufficiently explored.

This study was to investigate the enhancement of fracture toughness in shield segment concrete through the use of erosion-inhibiting materials, including silica nanoparticles, migrating corrosion inhibitors, and nano-sized precursors. In addition, the mechanism by which these materials could affect the microstructure of concrete was also analyzed from the perspective of interfacial transition zone optimization.

Methods

In this study, the fracture behavior of concrete was investigated by a three-point bending test method. During the loading process, the displacement of the specimens was monitored using digital image correlation (DIC). Also, the interfacial transition zone of the concrete was analyzed via backscattered electron imaging analysis. The fracture toughness of the concrete microstructure was characterized by nano-indentation scratching technique.

Results and discussion

Based on the implementation of erosion inhibition measures, the fracture toughness of concrete is notably enhanced. In concrete specimens treated with silica nanoparticles, migrating corrosion inhibitors, and nano-precursors at various dosages, the crack initiation toughness is increased by 22.6%-48.9%, the instability toughness is improved by 18.8%-49.8%, and the fracture energy is elevated by 0.50-1.59 times. The improvement in fracture toughness is closely associated with the physical and chemical interactions of these materials within the concrete. The silica nanoparicles coating penetrates into the cement matrix, promotes a further hydration, and provides additional nucleation sites. Its reaction products effectively fill pores and reduce the number of initial defects and microcracks, resulting in a denser cement matrix with improved strength and deformation properties. The active molecules in the migrating corrosion inhibitor form coordination bonds with calcium ions in cement hydration products, anchoring themselves within the hydration phases. The main components migrate to the steel-concrete interface, forming a protective adsorbed layer that delays reinforcement corrosion. The nano-precursor material undergoes an ion-exchange reaction during cement hydration, in-situ generating calcium carboxylate compounds. These hydrophobic substances are uniformly dispersed in nanoscale within the C-S-H gel network, significantly enhancing the interfacial wetting behavior via reducing the surface energy of pore channels. Furthermore, the nanoparticles released from the precursor decomposition fill internal pores, block connected voids, optimize pore size distribution, and increase matrix density.

Conclusions

The application of erosion-inhibiting materials significantly enhanced the fracture toughness of the concrete. In shield segment concrete treated with nano-silica coating, migrating corrosion inhibitor, and nano-precursors at varying dosages, the peak load was increased by 16.8%-37.1%, crack initiation toughness was improved by 22.6%-48.9%, unstable fracture toughness was increased by 18.8%-49.8%, and fracture energy was enhanced by 0.50-1.59 times, compared to the reference group. Before peak load, the migrating corrosion inhibitor and nano-silica coating both contributed to a reduction in the Crack Tip Opening Displacement (CTOD), while the nano-precursor was effective in lowering CTOD values at all loading stages. During the post-peak phase (specifically at 30% beyond peak stress), the CTOD was decreased by 31.8%-47.2% with nano-precursor incorporation. The erosion-inhibiting materials also improved the properties of the Interfacial Transition Zone (ITZ). The ITZ thickness of the materials treated with silica nanoparticles coating and migrating corrosion inhibitor could be reduced by 7.1% and 6.5%, respectively.

Key words

subsea tunnel / shield segment concrete / fracture toughness / crack tip opening displacement / interfacial transition zone

引用本文

石贺男, 李化建, 黄法礼, 董昊良, 李良顺. 海底隧道盾构管片混凝土断裂性能提升方法及微观机理. 硅酸盐学报, 2026 , 54 (8) : 2753 -2764 . DOI: 10.14062/j.issn.0454-5648.20250820

Henan SHI, Huajian LI, Fali HUANG, Haoliang DONG, Liangshun LI. Methods for Enhancing Fracture Performance and Microscopic Mechanisms of Concrete in Subsea Tunnel Shield Segments[J]. Journal of the Chinese Ceramic Society, 2026 , 54 (8) : 2753 -2764 . DOI: 10.14062/j.issn.0454-5648.20250820

基金

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国家自然科学基金(52438002)
中国国家铁路集团有限公司科技研究开发计划(J2023G003)
新基石科学基金会科学探索奖

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2026年第54卷第8期

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文章信息

doi: 10.14062/j.issn.0454-5648.20250820

接收时间：2025-11-07
首发时间：2026-10-22
出版时间：2025-12-16

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出版历史

收稿日期：2025-11-07
修回日期：2025-11-24

基金

国家自然科学基金(52438002)

中国国家铁路集团有限公司科技研究开发计划(J2023G003)

新基石科学基金会科学探索奖

作者信息

^1．中国铁道科学研究院集团有限公司铁道建筑研究所，北京 100081

^2．高速铁路轨道系统全国重点实验室，北京 100081

通讯作者:

李化建（1976—），男，博士，研究员。

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https://castjournals.cast.org.cn/joweb/gsyxb/CN/10.14062/j.issn.0454-5648.20250820

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2种不同金属材料的力学参数

科 Family	属数 Number of genus	种数 Number of species	占总种数比例 Percentage of total species (%)	属 Genus	种数 Number of species	占总种数比例 Percentage of total species (%)
鹅膏菌科Amanitaceae	2	11	5.26	鹅膏菌属 Amanita	10	4.78
小菇科 Mycenaceae	2	12	5.74	丝盖伞属 Inocybe	5	2.39
多孔菌科 Polyporaceae	8	14	6.70	蜡蘑属 Laccaria	5	2.39
红菇科 Russulaceae	3	23	11.00	小皮伞属 Marasmius	6	2.87
				小菇属 Mycena	11	5.26
				光柄菇属 Pluteus	5	2.39
				红菇属 Russula	17	8.13
				栓菌属 Trametes	5	2.39

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