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采用双参数地基模型分析管棚变形及内力特征

Keywords: 管棚,弹性地基梁模型,暗挖法,Pasternak模型,力学模型

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Abstract:

管棚法在暗挖地下工程中已有较多的应用,通过对管棚力学特征进行理论分析,以期对其设计与施工有所帮助.以北京地铁4~#线西单站工程为例,建立管棚受力的双参数弹性地基梁模型,推导出管棚的挠度及转角、弯矩微分方程,并进行求解,根据管棚两端支撑条件,分析了其变形和内力特征.分析表明,管棚的最大挠度和最大剪力出现在掌子面附近已开挖未支护的部分,掌子面前方1.5~2.0倍开挖高度范围内的围岩有变形和松动.

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