新建隧道超近距离下穿既有地铁施工方案优化

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摘要研究目的：针对新建隧道超近距离下穿既有地铁车站的工程特点，为了优化施工方案，保证既有车站结构安全及运营正常，采用FLAC3D三维快速拉格朗日差分方法分析软件对不同开挖工法及周围地层不同加固范围等施工方案进行数值模拟，寻求既有车站轨道沉降、结构应力及新建区间隧道周边变形、结构受力特点及规律。

研究结论：(1)通过对新建隧道采用全断面法、台阶法和CRD法开挖过程的计算结果分析比较，得出：采用CRD法施工可较有效控制既有车站轨道变形和结构受力；(2)通过对新建隧道周围地层采用不同加固范围情况下的数值模拟结果进行分析，建议对新建区间隧道周围地层采取夹土层、掌子面地层和隧道左右侧3.0m范围地层进行注浆加固；(3)本研究成果可为类似的隧道下穿既有地铁工程设计和施工提供参考。

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	朱正国
	余剑涛
	朱永全
	王锦涛

关键词 ：隧道, 既有地铁, 车站, 下穿, 数值模拟

Abstract：Research purposes: In order to optimize the construction scheme and ensure the safety and operation of the existing station structure, the simulations were made for the construction schemes with the different excavation methods and for the different reinforcement ranges of the surrounding strata by using the analysis software with FLAC3D three-dimensional fast Lagrangian method according to the engineering characteristics of new tunnel under-passing the existing metro station at short range for the purposes of knowing the characteristics and laws of the existing station's track settlement and structure stress and the new tunnel's surrounding deformation and structure bearing load.

Research conclusions: (1) From the analysis and comparison of the calculations results of the excavation processes obtained by using method, the track the full section method, the bench method and CRD method, it is concluded by using the CRD deformation and structure bearing load of the existing station can be effectively controlled.(2)On the base of the analysis of the numerical simulation results of the different reinforcement ranges for the surrounding strata around the new tunnels, it is proposed the grouting reinforcement should be conducted to the soil sandwich layer, the working face layer and the layer within 3.0m range on the left and right sides of the tunnel. (3)This result can provide the reference to the design and construction of the similar tunnel under-passing the existing subway.

Key words： tunnel existing subway station under-passing numerical simulation

收稿日期: 2013-04-27

PACS:

U455

基金资助:国家自然科学基金(51078243)；河北省自然科学基金(E2012210011)；河北省高等学校科学技术研究基金资助项目(QN20131179, ZD20131065)

作者简介: 朱正国，1977年出生，男，副教授。

引用本文:

朱正国，余剑涛，朱永全，王锦涛. 新建隧道超近距离下穿既有地铁施工方案优化[J]. 铁道工程学报, 2013, 30(9): 111-115.
ZHU Zheng-guo, YU Jian-tao, ZHU Yong-quan, WANG Jin-tao. Study on Optimization of Construction Schemes for New Tunnel Under-pass the Existing Subway Station at Short Range. 铁道工程学报, 2013, 30(9): 111-115.

链接本文:

http://tdgcxb.crec.cn/CN/ 或 http://tdgcxb.crec.cn/CN/Y2013/V30/I9/111

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