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| 基于渗流-应力耦合分析隧道双层衬砌力学特性 |
| Analysis of Mechanical Properties of Tunnel Double-layer Lining Based on Seepage-stress Coupling |
| 投稿时间：2021-01-15 |
| DOI：10.16018/j.cnki.cn32-1650/n.202102011 |
| 中文关键词: 双层衬砌 结构计算 渗流-应力耦合 渗透系数 数值计算 |
| 英文关键词: double-layer lining structural calculation seepage-stress coupling permeability coefficient numerical calculation |
| 基金项目:安徽省高校科学研究项目重点项目(KJ2019A1020、KJ2019A0822)；合肥学院自然科学基金重大项目(18ZR02ZDA)。 |
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| 中文摘要: |
| 城市地铁盾构隧道支护结构主要为单层衬砌。为满足支护结构承载、防渗、开裂等要求，双层衬砌结构设计日益成熟。为揭示双层衬砌力学特性，首先通过推导渗流-应力耦合方程组，揭示地下土体应力、渗流相互耦合方程；基于渗流-应力耦合原理，利用ABAQUS软件，考虑围岩压力、隧道埋深等工况，计算、比较单层衬砌、双层衬砌的承载力特性，得到以下结论:(1)初衬、二衬在支护作用下均承载，但是初衬应力为二衬3倍左右，为主要承载结构；(2)在渗透系数减小的情况下，初衬应力增加、二衬应力减小，二衬的作用主要为防渗和安全储备。 |
| 英文摘要: |
| The supporting structure of urban subway shield tunnel is mainly single-layer lining. In order to meet the requirements of bearing capacity, anti-seepage and cracking of supporting structure, the design of double-layer lining structure is becoming more and more mature. In order to reveal the mechanical characteristics of double-layer lining, the coupling equations of stress and seepage of underground soil are firstly derived by deriving the seepage-stress coupling equations. Secondly, based on the principle of seepage and stress coupling, Abaqus software was used to calculate and compare the bearing capacity characteristics of single-layer lining and double-layer lining under the conditions of surrounding rock pressure and tunnel depth. The following conclusions can be drawn: (1)Both primary lining and secondary lining bear loads under the support action, but the stress of primary lining is about 3 times of that of secondary lining, which is the main bearing structure. (2)When the permeability coefficient decreases, the stress of primary lining increases and the stress of secondary lining decreases. The main function of secondary lining is seepage prevention and safety reserve. |
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