浅埋大跨度隧道施工中非均衡支护设计的影响分析

董新平

浅埋大跨度隧道施工中非均衡支护设计的影响分析 English Version

董新平

郑州大学交通工程系，河南郑州 450002

详细信息

作者简介:
董新平 (1970 – ),男，河南淇县人，博士，副教授，主要从事隧道及地下空间领域研究与教学工作。

中图分类号: TU432
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出版历程
- 发布日期: 2012-06-19

Effect of unsymmetrical support parameters on construction of large-span tunnel with shallow overburden

DONG Xin-ping

Department of Communication Engineering, Zhengzhou University, Zhengzhou 450002, China

摘要

摘要: 针对当前大跨度隧道施工中出现的一些问题，选取某城市软土地层中采用双侧壁法施工的大跨度隧道为案例，就导洞初期支护的非均衡设计对地表沉降控制以及支护结构内力转换等方面的影响情况进行分析，分析表明：采用 timoshenko 分层梁模拟支护以及对支护构件按等效刚度处理是合适的，计算结果与实测规律比较吻合；导洞支护的非均衡支护设计对地表沉降影响较大，内壁刚度过度减弱，将导致中洞开挖阶段的地表沉降值迅速增加，给中洞施工带来压力；非均衡支护设计将直接影响支护结构的最终内力分布及中洞开挖阶段的支护内力转换，而对拆撑阶段支护内力的影响相对较小。
- 隧道 /
- 双侧壁导坑法 /
- 非均衡支护设计
Abstract: To deal with the extreme deformation and damage during the construction of large-span tunnels, one case study of large-span tunnel with shallow overburden, constructed by double-side drift method, is conducted, and the FEM results are verified according to the measured data. The effect of unsymmetrical support parameters of side drift on the settlement of ground surface and transfer of internal force of supports is analyzed. It is demonstrated that the Timoshenko laminated beam theory is suitable for calculating the internal force of the primary supports. The unsymmetrical support design has a great effect on the settlement of ground surface and the distribution and transfer of internal force of supports during the excavation phase of central drift. When the stiffness of inner wall is reduced to some extent, the settlement of ground surface will grow rapidly.
- tunnel /
- double side drift method /
- unsymmetrical support design

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参考文献(18)

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