Assessment of structural performance of super large cross-section subsea RC shield tunnels: Emphasis on the combined effects of highly hydrostatic pressure and corrosion-induced deterioration

被引：4

作者：

He, Zhengshu ^{[1
]}

He, Chuan ^{[1
]}

Kang, Xiaoyue ^{[1
]}

Huang, Xing ^{[1
]}

Wang, Shimin ^{[1
]}

机构：

[1] Southwest Jiaotong Univ, MOE Key Lab Transportat Tunnel Engn, Chengdu 610031, Peoples R China

来源：

OCEAN ENGINEERING | 2023年 / 288卷

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

Subsea RC shield tunnel; Large tunnel section dimension; Ultra-high hydrostatic pressure; Nonuniform steel corrosion; Deterioration; Structural safety; RELIABILITY-ANALYSIS; SPATIAL VARIABILITY; PITTING CORROSION; CONCRETE QUALITY; CRACK WIDTH; BEHAVIOR; DESIGN; STEEL; REINFORCEMENT; BARS;

D O I：

10.1016/j.oceaneng.2023.116134

中图分类号：

U6 [水路运输]; P75 [海洋工程];

学科分类号：

0814 ; 081505 ; 0824 ; 082401 ;

摘要：

For the subsea reinforced concrete (RC) shield tunnels in China, the use of super large tunnel section and the presence of high hydrostatic pressure from seawater have been becoming increasingly common in practical engineering. However, owing to the combined effects of complex structural systems, extreme external loads and aggressive environments, it is a great challenge to sustain a reliable structural performance of these subsea shield tunnels within the prescribed service life. In this study, a novel approach for evaluating the structural safety of a deteriorated large-section subsea RC shield tunnel is presented with an emphasis on the spatial correlation and variation of corrosion damages and the impact of high hydrostatic pressure. Gumbel distributed random fields are established to simulate the spatial variability of steel corrosion in the segmental linings. A random field-based numerical model for the deteriorated RC segmental linings is developed in conjunction with the modeling of nonuniform steel corrosion and local-regional material degradation. In an illustrative example, the effects of the corrosion degree of internal and external steel reinforcements and the level of applied hydrostatic pressure on the structural safety of a large-section subsea RC shield tunnel are investigated.

引用

页数：15