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隧道二衬结构受力影响因素的敏感性分析

, PP. 86-91

Keywords: 隧道工程,敏感性分析,荷载-结构法,二衬,影响因素

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Abstract:

基于荷载-结构模型及有限元分析手段,以200km时速青荣城际铁路隧道二衬为研究对象,运用敏感系数法对二衬结构受力影响因素的敏感性进行了分析。主要考虑围岩弹性抗力系数、二衬厚度、二衬弹性模量及侧压力系数4个影响因素,并根据实际工程进行取值。分析表明,对拱顶弯矩而言,各因素的敏感性依二衬厚度、围岩弹性抗力系数、侧压力系数及二衬弹性模量而减小;对拱顶轴力而言,各因素的敏感性依侧压力系数、围岩弹性抗力系数、二衬厚度及二衬弹性模量而减小;对拱项竖向位移而言,各因素的敏感性依围岩弹性抗力系数、二衬厚度、侧压力系数及二衬弹性模量而减小;对拱顶截面安全系数而言,各因素的敏感性依围岩弹性抗力系数、侧压力系数、二衬厚度及二衬弹性模量而减小。

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