Failure mechanism of deep-buried and large cross-section subway station tunnel: Geo-mechanical model test and numerical investigation

IF 6.7 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Deng Gao , Yusheng Shen , Pengfa Zhou , Andi Gou , Mingyu Chang , Jun Dong , Kang Wu
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Abstract

In some megacities, urban subway and municipal engineering are developing in the tendency of large cross-section and great buried depth, which brings a series of challenges to the design and construction of underground engineering. The mechanical characteristics and failure mechanism of tunnels have been paid more and more attention. Based on Xietaizi Subway Station tunnel in Chongqing, China, the paper carried out a geo-mechanical model test to simulated partial excavation processes of the large cross-section tunnel, integrating the resultant disturbances from partial excavation. The deformation and stress characteristics of the tunnel under different buried depths are analyzed, and the failure mechanism of large cross-section tunnel lining is investigated. The reliability of the research results is verified by the geo-mechanical model test and numerical simulation. The results indicate that under the pressure of the surrounding rock, the tunnel lining adjusts its internal forces primarily through deformation before transitioning to cracking, and retains earing capacity after the first crack appears. The tunnel structure experiences a process characterized by ‘elasticity-plasticity-injury-failure’. The tunnel section exhibits a ‘flattening’ deformation trend. The invert cracks are primarily distributed within a range of 0.5 times the tunnel span, while the vault cracks are mainly concentrated at the mid-span. Ultimately, the tunnel structure is compromised by the fracture of the invert’s middle section.
深埋大断面地铁车站隧道的破坏机理:地质力学模型试验和数值研究
在一些特大城市,城市地铁和市政工程正朝着大断面、大埋深的趋势发展,这给地下工程的设计和施工带来了一系列挑战。隧道的力学特性和破坏机理越来越受到重视。本文以中国重庆斜台子地铁站隧道为研究对象,结合局部开挖产生的扰动,对大断面隧道的局部开挖过程进行了地质力学模型试验模拟。分析了隧道在不同埋深下的变形和应力特征,研究了大断面隧道衬砌的破坏机理。通过地质力学模型试验和数值模拟验证了研究结果的可靠性。结果表明,在围岩的压力作用下,隧道衬砌在过渡到开裂之前主要通过变形来调整其内力,在出现第一条裂缝后仍能保持其承载能力。隧道结构经历了一个以 "弹性-塑性-损伤-破坏 "为特征的过程。隧道断面呈现出 "扁平化 "变形趋势。倒裂缝主要分布在隧道跨度的 0.5 倍范围内,而拱顶裂缝主要集中在跨度中部。最终,隧道结构因洞中段的断裂而受到破坏。
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来源期刊
Tunnelling and Underground Space Technology
Tunnelling and Underground Space Technology 工程技术-工程:土木
CiteScore
11.90
自引率
18.80%
发文量
454
审稿时长
10.8 months
期刊介绍: Tunnelling and Underground Space Technology is an international journal which publishes authoritative articles encompassing the development of innovative uses of underground space and the results of high quality research into improved, more cost-effective techniques for the planning, geo-investigation, design, construction, operation and maintenance of underground and earth-sheltered structures. The journal provides an effective vehicle for the improved worldwide exchange of information on developments in underground technology - and the experience gained from its use - and is strongly committed to publishing papers on the interdisciplinary aspects of creating, planning, and regulating underground space.
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