Journal of Shandong University(Engineering Science) ›› 2019, Vol. 49 ›› Issue (4): 78-85.doi: 10.6040/j.issn.1672-3961.0.2018.055

• Mechanical, Energy and Power Engineering • Previous Articles     Next Articles

Impact analysis on construction of large section and small spacing road tunnel

Mingcai LIU()   

  1. China Railway 14th Bureau Group 2nd Engineering Co., Ltd., Tai'an 271000, Shandong, China
  • Received:2018-01-28 Online:2019-08-20 Published:2019-08-06

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Abstract:

The construction project of Fo Yangling Tunnel was taken as the research background, the construction was carried out by using benching tunneling construction method. The fast Lagrangian analysis of continua 3D (FLAC3D) finite element software was used as the calculation platform to establish the finite element model of tunnel with large section and small clear distance. The tunnel model was numerically simulated and subsidence, stress of surrounding rock and lining structural were analyzed. And the corresponding monitoring and reinforcement measures were put forward. The results of numerical analysis showed that the settlement of the upper part of the advance tunnel was larger than the subsequent tunnel. The construction of the subsequent tunnel increased the vertical displacement of the advance tunnel, which caused the increase of maximum principal stress and the minimum principal stress. The stress of tunnel lining structure was concentrated in the area from arch waist to arch foot. The support structure of advance tunnel played the role of stabilizing rock mass in the excavation of subsequent tunnel, and the excavation of the subsequent tunnel would make the stress concentration of the middle rock. In the construction, attention should be payed to the surrounding rock and reinforcement measures should be taken. The analysis results could provide a scientific basis for the design and construction of large section and small spacing road tunnel.

Key words: large section, small spacing, road tunnel, numerical simulation, impact analysis

CLC Number: 

  • U455

Fig.1

Vertical section geological engineering map of Fo Yangling Tunnel"

Fig.2

Numerical calculation model"

Table 1

Material parameter value"

围岩弹性模量/GPa泊松比粘聚力/kPa摩擦角/(°)密度/(kg·m-3)
坡积层0.410.352017.51 650
全风化花岗岩1.800.282635.01 980
中风化花岗岩2.500.253035.02 200
初期支护24.000.172 500

Fig.3

Vault settlement curves with construction steps at YK116+263"

Fig.4

Vault settlement curves with construction steps at YK116+285"

Fig.5

Surface subsidence curves"

Fig.6

Location map of control points"

Fig.7

Vertical displacement curves of control points in left tunnel with right tunnel excavation"

Fig.8

Horizontal displacement curves of control points in left tunnel with right tunnel excavation"

Fig.9

Horizontal displacement cloud of the left tunnel after completion of left tunnel excavation"

Fig.10

Horizontal displacement cloud of the left tunnel after completion of right tunnel excavation"

Table 2

Principal stress of lining structure"

MPa
控制点先行洞最大主应力后行洞最大主应力先行洞最小主应力后行洞最小主应力
左洞开挖完成右洞开挖完成左洞开挖完成右洞开挖完成
A-0.110-0.310-0.127-1.562-1.838-1.395
B-0.133-0.326-0.157-0.903-1.302-0.969
C-0.122-0.376-0.121-1.244-1.933-1.240
D-0.310-0.581-0.450-1.306-2.481-1.584
E0.107-0.084-0.015-0.277-0.5210.426
F-0.131-0.332-0.318-1.285-1.574-1.386

Fig.11

Vertical stress cloud after left hole excavation"

Fig.12

Vertical stress cloud after right hole excavation"

Fig.13

Layout of surface settlement monitoring points"

Table 3

Application of reinforcement measures"

加固措施超前注浆长系统锚杆水平对拉锚杆
适用情况净距大于1倍跨度净距大于6 m净距小于6 m
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