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Journal of ZheJiang University (Engineering Science)  2021, Vol. 55 Issue (2): 330-337    DOI: 10.3785/j.issn.1008-973X.2021.02.013
    
Pre-protection effect of underground comprehensive pipe gallery over proposed tunnel
Yun-liang CUI1(),Zhi-yuan LI1,2,Gang WEI1,Jiang CHEN3,Lian-ying ZHOU1
1. Department of Civil Engineering, Zhejiang University City College, Hangzhou 310015, China
2. Civil Engineering College, Shaoxing University, Shaoxing 312000, China
3. Zhejiang Communications Construction Group Co. Ltd, Hangzhou 310051, China
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Abstract  

For the construction of the pipe gallery across the proposed subway tunnel, pre-protection measures for the pipe gallery structure were taken during the construction of the pipe gallery in order to reduce the impact of shield construction on the underground comprehensive pipe gallery. Distributed optical fibers were used to monitor the influence of shield construction on the pipe gallery structure. Numerical simulation method was used to analyze the influence of shield construction on the vertical displacement of the pipe gallery under different pre-protection schemes. Monitoring and analysis results show that the pre-protection measures of bottom reinforcement and anti-sinking piles can effectively control the influence of shield tunnel construction on the underground comprehensive pipe gallery, and the pre-protection effect is significant. The bottom reinforcement can effectively reduce the displacement difference between the two ends of the pipe gallery. The pile arrangement has an important influence on the settlement control effect of pipe gallery. The maximum settlement of the pipe gallery caused by the construction of the double-line shield tunnel occurred between the two lines. Better protection effect can be achieved by setting anti-sinking piles under two ends of single pipe gallery and between double-line tunnels, avoiding the path of shield tunnels.



Key wordsshield tunnel      pre-protection      numerical simulation      distributed optical fiber      settlement      underground comprehensive pipe gallery     
Received: 22 March 2020      Published: 09 March 2021
CLC:  U 458.1  
Fund:  国家自然科学基金资助项目(51808493);浙江省自然科学基金资助项目(LGF20E080007);浙江交工集团股份有限公司科研资助项目
Cite this article:

Yun-liang CUI,Zhi-yuan LI,Gang WEI,Jiang CHEN,Lian-ying ZHOU. Pre-protection effect of underground comprehensive pipe gallery over proposed tunnel. Journal of ZheJiang University (Engineering Science), 2021, 55(2): 330-337.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2021.02.013     OR     http://www.zjujournals.com/eng/Y2021/V55/I2/330


上跨拟建隧道的地下综合管廊预保护效果

针对地下综合管廊上跨拟建地铁隧道施工的情况,为了减少盾构施工对管廊的影响,在地下综合管廊施工时采取对管廊结构的预保护措施. 采用分布式光纤监测盾构施工对管廊结构的影响,并采用数值模拟手段分析不同预保护方案下盾构施工对管廊竖向位移的影响. 监测和分析结果表明:设置坑底加固联合减沉桩的预保护措施能有效控制盾构隧道施工对地下综合管廊变形的影响,预保护效果显著. 采用坑底加固可以有效减小管廊两端位移差;减沉桩的布桩方式对管廊沉降控制效果有重要影响;双线盾构隧道施工导致的管廊最大沉降发生在双线隧道之间部位,避开盾构线路在单节管廊两端和双线盾构隧洞之间部位设置减沉桩对管廊的保护效果更佳.


关键词: 盾构隧道,  预保护,  数值计算,  分布式光纤,  沉降,  地下综合管廊 
Fig.1 Positional relationship between pipe gallery and shield tunnels
土层 T/m γ/(kN·m?3 e IP/% w /%
① 填土 2.3 17.5 ? ? 34.0
② 黏土 3.6 17.8 0.915 18.9 30.0
③ 淤泥质粉质黏土 3.6 16.7 1.168 14.3 40.7
④ 淤泥质黏土 6.9 16.2 1.327 19.1 49.0
⑤ 圆砾 6.3 20.5 ? 14.6 ?
⑥ 全风化花岗岩 15.1 19.5 ? ? ?
⑦ 中风化花岗岩 12.2 22.0 ? ? ?
Tab.1 Physical property parameters of each soil layer
Fig.2 Optical fiber layout and monitoring
Fig.3 Strain difference of optical fiber monitoring after shield crossing
土层 本构模型 E /kPa $E_{50}^{{\rm{ref}}}$ /kPa $E_{{\rm{oed}}}^{{\rm{ref}}}$ /kPa $E_{{\rm{ur}}}^{{\rm{ref}}}$ /kPa m R $ c $ /kPa $ \varphi $ /(°) e $\;\mu$
MC 9000 ? ? ? ? ? 0 12.0 0.93 0.30
HS ? 4830 4830 33810 0.73 0.58 20.0 11.0 0.92 0.30
HS ? 4140 4140 28980 0.85 0.79 15.0 14.0 1.20 0.30
HS ? 3780 3780 26460 0.68 0.93 12.0 11.5 1.20 0.30
MC 72000 ? ? ? ? ? 3.5 40.0 0.80 0.28
MC 38400 ? ? ? ? ? 20.0 30.0 0.80 0.28
MC 90000 ? ? ? ? ? 50.0 30.0 0.80 0.28
Tab.2 Soil model parameters
结构 尺寸/mm γ/(kN·m?3 E /MPa $\;\mu$
盾构管片 ?=6200 25.4 34500 0.23
管廊 t=300、500 25.0 31500 0.23
减沉桩 ?=850 24.1 29500 0.23
注浆层 t=100 23.8 1000 0.30
盾壳 t=100 78.0 250000 0.20
加固层 t=4000 20.0 200 0.30
Tab.3 Structure dimension and material parameters
Fig.4 Position relationship between shield tunnel and existing pipe gallery
Fig.5 Vertical displacement of pipe gallery after shield passing
工况 坑底加固 减沉桩 备注
1 无预保护措施
2 管廊两端设桩 实际工程方案,桩布置方式见图1
3 管廊两端设桩 仅在两端设桩
4 仅坑底加固
5 桩布置方式见图6
6 桩布置方式见图6
Tab.4 Working conditions setting of pre-protection structure
Fig.6 Schematic diagram for setting of anti-sinking piles under conditions 5 and 6
Fig.7 Sketch map of pipe gallery settlement with different pile arrangement
Fig.8 Comparison of settlement of foundation reinforcement with settlement of other working conditions
Fig.9 Comparison of settlements of different pre-protection methods
Fig.10 Surface settlement of each monitoring section
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