铁道标准设计2017，Vol.61Issue(8)：101-106,6.DOI:10.13238/j.issn.1004-2954.2017.08.021
泥炭质土不同赋存条件对盾构隧道衬砌结构动力响应特性影响分析
Analysis of Dynamic Response Characteristics of Shield Tunnel Lining Structure in Peat Soil of Different Deposit Conditions
摘要
Abstract
In order to provide theoretical guidance for seismic design of shield tunnel lining structure in peat soil, the article uses the finite element dynamic analysis to study dynamic response characteristics of shield tunnel lining structure in peat soil of different deposit conditions based on Kunming Metro line 3 . The results show that when surrounding strata is rich in peat soil interlayer, under earthquake load, the force pattern of tunnel structure is oval-shaped with decreased magnitude of axial force, large bending moment and principal stress and small shear force. The largest decrement magnitude of the peat soil interlayer on both sides is the most favorable for tunnel anti-earthquake. When tunnel is coved and paved with peat soil, the contact point between formation interface and tunnel structure produces abnormal dynamic stress concentration, and is the weak part in the design of seismic tunnel structure. Therefore, design and construction of shield tunnel should address the inhomogeneity of lateral rock-soil mass of tunnel structure so as to ensure long-term safety of tunnel.关键词
地铁/盾构隧道/泥炭质土/赋存条件/动力响应Key words
Metro/Shield tunnel/Peat soil/Deposit conditions/Dynamic response分类
交通工程引用本文复制引用
胡瑞青,王士民..泥炭质土不同赋存条件对盾构隧道衬砌结构动力响应特性影响分析[J].铁道标准设计,2017,61(8):101-106,6.基金项目
国家自然科学基金面上项目(51578461) （51578461）
