Numerical Simulation of Mechanical Characteristics and Safety Performance for Pre-Cracked Tunnel Lining with the Extended Finite Element Method

IF 3.1 3区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY
Xin Lu, Yong Liu, Xiaolong Hou, Cai Chen, Ruidan Gao
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Abstract

The service performance of tunnel lining is affected by crack properties and development states. In this paper, numerical simulation models were established to investigate the mechanics characteristics and safety performance for lining structures under different cracks based on the extended finite element method (XFEM). Analyze multiple quantitative factors in simulation, including changes in crack location, crack length, and crack distribution range in the lining structure. The axial force and bending moment of the preset cracks in the lining structures were first studied. The maximum safety factor attenuation rate (Dkmax) was proposed to analyze the impact of longitudinal and annular cracks on the safety performance. The axial force at the vault of the lining arch is the most significantly affected by the combined longitudinal cracks at multiple locations. When the length of a longitudinal crack increases from 1 m to 6 m, the axial force value at the crack point decreases by 33.77%, 36.15%, and 11.32%. However, the bending moment value increases by 4.47 times, 2.50 times, and 1.69 times. Under the influence of longitudinal cracks in an “arch crown + arch shoulder”, “arch crown + arch waist”, and “arch crown + arch shoulder + arch waist”, the axial force in the arch vault increased by 21.55%, decreased by 17.52%, and decreased by 13.45%. The distribution pattern of the bending moment under the influence of circumferential cracks shows convexity at the arch shoulder and arch foot, and concavity at the arch waist and side walls. The safety factor scatter curve with longitudinal cracks shows a gradual transition from a “W” shape to a “U” shape. The safety factor curve with circumferential cracks presents an approximately symmetrical wave-shaped distribution.
用扩展有限元法对预开裂隧道衬砌的机械特性和安全性能进行数值模拟
隧道衬砌的使用性能受裂缝特性和发展状态的影响。本文基于扩展有限元法(XFEM)建立了数值模拟模型,研究不同裂缝下衬砌结构的力学特性和安全性能。在模拟中分析多种定量因素,包括衬砌结构中裂缝位置、裂缝长度和裂缝分布范围的变化。首先研究了衬砌结构中预设裂缝的轴向力和弯矩。提出了最大安全系数衰减率(Dkmax),以分析纵向和环向裂缝对安全性能的影响。衬砌拱顶处的轴向力受多处纵向裂缝的综合影响最大。当纵向裂缝长度从 1 米增加到 6 米时,裂缝点的轴向力值分别减少了 33.77%、36.15% 和 11.32%。然而,弯矩值分别增加了 4.47 倍、2.50 倍和 1.69 倍。在 "拱冠 + 拱肩"、"拱冠 + 拱腰 "和 "拱冠 + 拱肩 + 拱腰 "纵向裂缝的影响下,拱顶的轴向力分别增加了 21.55%、减少了 17.52%和减少了 13.45%。圆周裂缝影响下的弯矩分布模式在拱肩和拱脚处呈 "凸 "状,在拱腰和侧壁处呈 "凹 "状。纵向裂缝的安全系数散点曲线从 "W "形逐渐过渡到 "U "形。周向裂缝的安全系数曲线呈现近似对称的波形分布。
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来源期刊
Buildings
Buildings Multiple-
CiteScore
3.40
自引率
26.30%
发文量
1883
审稿时长
11 weeks
期刊介绍: BUILDINGS content is primarily staff-written and submitted information is evaluated by the editors for its value to the audience. Such information may be used in articles with appropriate attribution to the source. The editorial staff considers information on the following topics: -Issues directed at building owners and facility managers in North America -Issues relevant to existing buildings, including retrofits, maintenance and modernization -Solution-based content, such as tips and tricks -New construction but only with an eye to issues involving maintenance and operation We generally do not review the following topics because these are not relevant to our readers: -Information on the residential market with the exception of multifamily buildings -International news unrelated to the North American market -Real estate market updates or construction updates
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