•  
  •  
 

Abstract

Based on the shallow-buried underground excavation project of the double-arch tunnel at the entrance and exit line of Yanming Lake Parking Lot of Xi’an Metro Line 5, and in accordance with the thick fill soil layer of the site and the engineering conditions of the existing sections near the site, this paper proposed several key construction techniques for small-section double-arch metro tunnels in loess areas. The feasibility of the construction of the middle guide tunnel + upper and lower step method was verified by means of numerical analysis. Meanwhile, different forms of advanced support methods were adopted according to the geological conditions of different construction sections, and the proportion of the excavation section of the middle guide tunnel was appropriately increased, effectively reducing the mutual influence of the construction of the left and right tunnels. In addition, the project adopted a self-designed asymmetric lining trolley for the secondary lining construction, which solved the problem of secondary lining bias and formwork shifting. In the feedback of on-site monitoring data, the maximum values of surface settlement, the subsidence of the arch top of the newly built tunnel, and the convergence of the arch waist of the existing tunnel were 14.1 mm, 8.2 mm, and 3.9 mm, respectively, all of which were less than the construction control values, verifying the rationality and safety of the key construction techniques expounded in this paper.

Publication Date

6-18-2022

DOI

10.14048/j.issn.1671-2579.2022.03.029

First Page

160

Last Page

166

Submission Date

May 2025

Reference

[1] 刘新荣,钟祖良.黄土公路连拱隧道[M].北京:科学出版社,2016. Liu Xinrong, Zhong Zuliang. Loess highway multi-arch tunnels[M]. Beijing: Science Press, 2016. [2] 陈智强. 城市连拱隧道下穿挡墙段出洞方案优化与监测分析[J]. 现代隧道技术, 2016, 53(3): 157-163. CHEN Zhiqiang. Scheme optimization and monitoring analysis for the exit portal section of an urban double-arch tunnel under a retaining wall[J]. Modern Tunnelling Technology, 2016, 53(3): 157-163. [3] 刘新荣, 钟祖良, 黄金国, 等. 考虑古城墙保护的连拱隧道施工方案优化[J]. 中国地质灾害与防治学报, 2009, 20(2): 133-137. LIU Xinrong, ZHONG Zuliang, HUANG Jinguo, et al. Optimization of double multi-arch tunnel construction plan for rampart protection[J]. The Chinese Journal of Geological Hazard and Control, 2009, 20(2): 133-137. [4] 许崇帮, 夏才初, 朱合华. 双向八车道连拱隧道施工方案优化分析[J]. 岩石力学与工程学报, 2009, 28(1): 66-73. XU Chongbang, XIA Caichu, ZHU Hehua. Optimum analysis of construction scheme of multi-arch tunnel with eight traffic lanes[J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(1): 66-73. [5] 丁文其, 王晓形, 李志刚, 等. 龙山浅埋大跨度连拱隧道施工方案优化分析[J]. 岩石力学与工程学报, 2005, 24(22): 4042-4047. DING Wenqi, WANG Xiaoxing, LI Zhigang, et al. Optimal analysis of construction schemes for shallow large span Longshan twin tunnel[J]. Chinese Journal of Rock Mechanics and Engineering, 2005, 24(22): 4042-4047. [6] 秦溱. 连拱隧道衬砌裂缝现场调查与数值模拟分析[J]. 中外公路, 2016, 36(6): 199-203. Qin Zhen. Field investigation and numerical simulation analysis of lining cracks in multi-arch tunnels [J]. Journal of China & Foreign Highway, 2016, 36(6): 199-203. [7] 刘家澍, 凌同华, 张胜, 等. 分岔隧道连拱段施工数值模拟分析及其方案优化[J]. 中外公路, 2016, 36(5): 186-190. Liu Jiashu, Ling Tonghua, Zhang Sheng, et al. Numerical simulation analysis and scheme optimization for construction of bifurcated tunnel's multi-arch section [J]. Journal of China & Foreign Highway, 2016, 36(5): 186-190. [8] 唐峰, 袁昕, 袁航. 青山冲双连拱隧道软弱围岩变形与稳定性研究[J]. 铁道科学与工程学报, 2012, 9(5): 71-76. TANG Feng, YUAN Xin, YUAN Hang. Research on the deformation and stability of weak surrcunding rock mass in the Qingshanchong double-arch tunnel[J]. Journal of Railway Science and Engineering, 2012, 9(5): 71-76. [9] 潘龙,王建国,陈陆望.连拱隧道浅埋偏压段的受力和变形机制研究 [J].岩石力学与工程学报,2011,30(S2):3557-3566. Pan Long, Wang Jianguo, Chen Luwang. Mechanical and deformation mechanisms of shallow-buried bias section in multi-arch tunnels [J]. Chinese Journal of Rock Mechanics and Engineering, 2011, 30(S2): 3557-3566. [10] 刘尚芳. 连拱隧道爆破开挖对既有下部隧道的影响研究[J]. 中外公路, 2014, 34(3): 213-216. Liu Shangfang. Influence of blasting excavation on existing underlying tunnels in multi-arch tunnels [J]. Journal of China & Foreign Highway, 2014, 34(3): 213-216. [11] 李亚勇, 王芳其, 靳晓光, 等. 节理岩体中连拱隧道施工对周边建筑物的影响[J]. 重庆大学学报, 2015, 38(6): 115-122. LI Yayong, WANG Fangqi, JIN Xiaoguang, et al. Effect of multi-arc tunnel construction on buildings and subway in jointed rock mass[J]. Journal of Chongqing University, 2015, 38(6): 115-122. [12] 邹新宽, 张继春, 潘强, 等. 连拱隧道近接重叠既有隧道时的施工性态数值模拟[J]. 江苏大学学报(自然科学版), 2016, 37(2): 225-230. ZOU Xinkuan, ZHANG Jichun, PAN Qiang, et al. Numerical simulation and analysis of construction behavior for dual-arch tunnel tunneling overlapped to existing tunnel[J]. Journal of Jiangsu University (Natural Science Edition), 2016, 37(2): 225-230. [13] 皮亮, 蒋树屏. 穿越高层建筑大跨隧道施工力学与支护结构研究[J]. 地下空间与工程学报, 2017, 13(5): 1303-1310. PI Liang, JIANG (Shu)(BingPing). Study on the construction mechanics and support structure of large span city tunnel crossing high-rise building[J]. Chinese Journal of Underground Space and Engineering, 2017, 13(5): 1303-1310. [14] 王道远,袁金秀,朱永全,等.铁路隧道下穿既有专线地表沉降控制基准研究[J].地下空间与工程学报,2013,9(S2):1945-1950. Wang Daoyuan, Yuan Jinxiu, Zhu Yongquan, et al. Study on surface settlement control criteria for railway tunnels undercrossing existing dedicated lines [J]. Chinese Journal of Underground Space and Engineering, 2013, 9(S2): 1945-1950. [15] 汪振伟, 付钢. 城市连拱隧道施工地表沉降分析及预测研究[J]. 岩土力学, 2009, 30(S2): 418-421. WANG Zhenwei, FU Gang. Analysis and prediction of surface subsidence of double-arch tunnel construction in city[J]. Rock and Soil Mechanics, 2009, 30(S2): 418-421.

Download

Share

COinS