Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (7): 1997-2008.doi: 10.13229/j.cnki.jdxbgxb.20221217

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Calculation method and influencing factors of surface displacement during construction of curved shield tunnel

Guo-lin YANG1(),Yi-fan YANG1,Hao-dong XU1,Gui-jun LUO2,Hong-bo XIAO2   

  1. 1.School of Civil Engineering，Central South University，Changsha 410075，China
    2.Civil Engineering Co. Ltd. of China Construction Fifth Engineering Bureau，Changsha 410041，China
  • Received:2022-09-19 Online:2024-07-01 Published:2024-08-05

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Abstract:

To analyze the variation law and influencing factors of surface displacement during the construction of curved shield tunnel. The mechanical model of curved shield tunnel excavation considering active articulated mechanism is established， and the calculation methods of surface displacement caused by additional stress and ground loss based on mirror method and orifice expansion theory are deduced respectively. Based on the actual project， the corresponding monitoring test and numerical simulation are carried out， the sensitivity index affecting the surface displacement offset of curved shield was researched. The results show that： The surface displacement of the curved section is offset to the inside of the tunnel in the direction of tunnel excavation， and the maximum displacement value and offset value of the curved section obtained by the calculation method are basically consistent with the measured values. It is found that the sensitivity of the imbalance coefficient is the highest， while the turning radius and excavation radius are sensitive in the curve over-digging gap factor. It is recommended that the thrust difference and over-excavation range of the inner and outer cylinders should be reasonably controlled in the construction of the curve section.

Key words: shield tunnel, surface displacement, calculation method, curve over-digging gap, sensitivity

CLC Number: 

  • TU456.3

Fig.1

Curved shield excavation mechanical model considering actively articulated structures"

Fig.2

Schematic diagram of Mindlin solution afterspatial generalization"

Fig.3

Schematic diagram of calculation of additionalstresses on excavation surface"

Fig.4

Schematic diagram of curve excavation transformations"

Fig.5

Schematic diagram of calculation of frictionbetween shield shell and soil"

Fig.6

Schematic diagram of grouting pressure calculation"

Fig.7

Schematic diagram of spherical expansion"

Fig.8

Schematic diagram of calculation of tail loss"

Fig.9

Schematic diagram of overbreak in innerdirection of turning"

Fig.10

Numerical analysis model diagram"

Fig.11

Numerical analysis results of surface displacement displacement of curved shield tunnel"

Fig.12

Curves of surface displacement"

Table 1

Statistics of maximum displacement and offset"

名称实测值Peck方法有限元法本文方法
最大位移/mm13.0713.8914.4713.25
偏差比例/6.27%10.71%1.38%
偏移值/m311.253
偏差比例/66.67%58.330

Fig.13

Sensitivity of offset values of construction parameter"

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