含软弱夹层浅埋隧道变形特性及控制指标研究

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摘要以宁安(南京—安庆)客运专线钟鸣隧道交叉中隔壁(CRD)法施工地段为工程背景，采用FLAC3D对含软弱夹层浅埋隧道不同施工条件进行三维数值模拟分析，结合围岩变形现场实测数据，深入分析其围岩变形特性及控制效果，建立该类隧道围岩变形分级控制量化指标。研究结果表明：采用CRD工法开挖含软弱夹层浅埋隧道可以有效控制围岩变形，超前小导管注浆加固拱顶围岩可以明显控制其变形效应；由围岩开挖引起的纵向影响范围为3.0～3.5倍洞径，横向影响范围约为4.0倍洞径，且其围岩变形表现出明显的空间效应；模拟计算和现场实测的围岩变形规律基本一致，且与Panet曲线更接近，其开挖面处预收敛变形占总变形比值约为45%；围岩变形分级控制指标中地表沉降和拱顶下沉极限值分别为40 和80 mm，拱顶下沉速率和相对下沉极限值分别为5 mm/d和0.64%。

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关键词 ：隧道工程, 软弱夹层, 浅埋隧道, 变形特性, CRD工法, 控制指标

Abstract：Taking construction section with center cross diagram(CRD) method in Zhongming tunnel of Nanjing—Anqing passenger dedicated line for example，deformation of surrounding rock and control effect of shallow tunnel with weak interlayer were analyzed by comparing with site measurement in different construction conditions，and the quantitative indices of surrounding rock deformation are established. The results show that deformation of surrounding rock could been controlled effectively during excavation by CRD method，and it could been reduced by employing advanced conduit grouting in surrounding rock of vault；Surrounding rock ranges affected by excavating are 3.0-3.5 times of the tunnel diameter in longitudinal section and about 4.0 times in cross-section，showing spatial effect obviously. The laws of surrounding rock deformation remained basically the same in numerical simulation and site measurement and it was more similar to curve of Panet，and the advance core pre-convergence deformation of excavation face is about 45% of total deformation. The limit value of surface and vault subsidence are 40 and 80 mm respectively，and the limit value of rate and relative subsidence are 5 mm per day and 0.64% in vault.

Key words： tunnelling engineering weak interlayer shallow tunnel deformation characteristic center cross diagram (CRD)method control indices

收稿日期: 2013-05-26

引用本文:

吴旭平，杨新安，李亚翠，张建波. 含软弱夹层浅埋隧道变形特性及控制指标研究[J]. 岩石力学与工程学报, 2014, 33(sl): 2685-2691.
WU Xuping，YANG Xin?an，LI Yacui，ZHANG Jianbo. RESEARCH ON CONTROL INDICES AND DEFORMATION CHARACTERISTIC OF SHALLOW TUNNEL WITH WEAK INTERLAYER. , 2014, 33(sl): 2685-2691.

链接本文:

http://www.rockmech.org/CN/Y2014/V33/Isl/2685

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