新建隧道斜交下穿既有隧道变形预测模型研究
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蔡光伟(1975—),男,长沙市轨道交通集团有限公司高级工程师

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U452

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2021年长沙市住房和城乡建设局项目“盾构隧道长距离交叠、并行近接下穿运营地铁隧道施工安全控制技术研究”


Study on deformation prediction model of the existing tunnel obliquely crossed by new tunnel
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    摘要:

    为探究新建隧道斜交下穿既有隧道施工所引起的地层沉降变形规律,避免施工中既有隧道产生较大的沉降变形,影响正常的交通运营。根据沉降槽宽度的修正公式,推导出正常地层下新建隧道开挖引起的地层变形曲线,并基于当层法原理,考虑既有结构的刚度和既有隧道与新建隧道的夹角对沉降槽曲线的影响,推导出隧道斜交下穿既有隧道情况下任意地层沉降变形曲线的预测公式。通过工程实例分析,验证了该计算公式的可靠性,为类似的隧道斜交下穿既有隧道工程提供参考。

    Abstract:

    This paper aims to explore the rule of formation settlement induced by the construction of new tunnel obliquely passing underneath an existing tunnel,and to avoid the large settlement of the existing tunnel affecting the normal traffic operation. The deformation curve of normal strata caused by the excavation of the new tunnel is derived based on the modified formula for the width of settlement groove. Then,based on the equivalent layered principle,considering the effects of structure stiffness and the angle between two tunnels on the curve of settlement groove,the prediction formular is educed for the deformation curve of arbitrary strata caused by the excavation of the new tunnel under an existing tunnel. The reliability of the prediction formula is verified by the analysis of engineering examples. This study can provide a reference for similar cases.

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蔡光伟,刘振兴,钟可,等.新建隧道斜交下穿既有隧道变形预测模型研究[J].交通科学与工程,2022,38(4):65-71.
CAI Guangwei, LIU Zhenxing, ZHONG Ke, et al. Study on deformation prediction model of the existing tunnel obliquely crossed by new tunnel[J]. Journal of Transport Science and Engineering,2022,38(4):65-71.

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  • 在线发布日期: 2023-01-05
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