Stability of dual square tunnels in rock masses subjected to surcharge loading

被引：45

作者：

Xiao, Yao ^{[1
]}

Zhao, Minghua ^{[1
]}

Zhang, Rui ^{[1
]}

Zhao, Heng ^{[1
]}

Wu, Gaoqiao ^{[1
]}

机构：

[1] Hunan Univ, Inst Geotech Engn, Changsha 410082, Hunan, Peoples R China

来源：

TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY | 2019年 / 92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：

Dual square tunnels; Rock mass; Adaptive finite element; Limit analysis; Stability number; CIRCULAR TUNNELS; UNDRAINED STABILITY; BEARING CAPACITY; LOWER BOUNDS; SOILS;

D O I：

10.1016/j.tust.2019.103037

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The stability of dual unlined square tunnels subjected to surcharge loading in rock masses, obeying Generalized Hoek-Brown (GHB) failure criterion, is investigated by adaptive finite element limit analysis (AFELA) under plane strain conditions. Both upper bound (UB) and lower bound (LB) of the dimensionless stability number N are obtained, with the relative errors being found within 7%. Extensive parametric studies are conducted to investigate the effects of the center-to-center distance ratio, cover depth ratio, geological strength index (GSI) and material constant for intact rock (m(i)). The results are presented in the form of dimensionless stability tables and charts for engineers to use, and typical failure mechanisms are discussed. The results obtained in this study compare reasonably well with the solutions reported in the literature.

引用

页数：10

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