Performance of large cross-section tunnel constructed in loose ground by optimal multi-step excavation method

Although an appropriate tunnel construction method can be conducive to safeguarding the deformation of surrounding rock mass, too much emphasis on controlling deformation leads to ignoring the importance of accelerating tunnelling speed and saving construction costs. Therefore, this paper presents a...

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Veröffentlicht in:Arabian journal of geosciences 2020-09, Vol.13 (18), Article 930
Hauptverfasser: Li, Songtao, Tan, Zhongsheng, Wu, Jinke, Du, Wentao
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container_title Arabian journal of geosciences
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creator Li, Songtao
Tan, Zhongsheng
Wu, Jinke
Du, Wentao
description Although an appropriate tunnel construction method can be conducive to safeguarding the deformation of surrounding rock mass, too much emphasis on controlling deformation leads to ignoring the importance of accelerating tunnelling speed and saving construction costs. Therefore, this paper presents a historical case of large cross-section tunnel in loose ground, which was excavated by optimal multi-step excavation method. First, to investigate the influence on rock mass deformation by the centre diaphragm (CD) method and optimal tunnelling method, comparative studies were performed by numerical simulation of the hypothetical construction schemes. Then, field monitoring was carried out to further reveal rock mass deformation and structural load characteristics with optimal excavation method. Numerical simulation results show that, compared with CD method, the optimal construction method is more helpful in controlling tunnel invert uplift but has minor disadvantages of increasing horizontal displacement of surrounding rock mass. However, tunnel crown settlement excavated by CD method is approximately similar to that of optimal construction method. Field test results confirm the effectiveness of optimal tunnelling method on controlling excavation-induced tunnel deformation; the maximum vault settlement and horizontal convergence of drift are approximately 57.5 mm and 8.5 mm, respectively. Moreover, the maximum inside and outside forces of steel set are 172.5 MPa and 151.5 MPa. The rock bolt is subjected mainly to a tensile force with a maximum value of up to 29.3 MPa. Therefore, as the crucial part of initial support structure, steel sets and rock bolts are under appropriate conditions and do not exceed their bearing capacity.
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Therefore, this paper presents a historical case of large cross-section tunnel in loose ground, which was excavated by optimal multi-step excavation method. First, to investigate the influence on rock mass deformation by the centre diaphragm (CD) method and optimal tunnelling method, comparative studies were performed by numerical simulation of the hypothetical construction schemes. Then, field monitoring was carried out to further reveal rock mass deformation and structural load characteristics with optimal excavation method. Numerical simulation results show that, compared with CD method, the optimal construction method is more helpful in controlling tunnel invert uplift but has minor disadvantages of increasing horizontal displacement of surrounding rock mass. However, tunnel crown settlement excavated by CD method is approximately similar to that of optimal construction method. Field test results confirm the effectiveness of optimal tunnelling method on controlling excavation-induced tunnel deformation; the maximum vault settlement and horizontal convergence of drift are approximately 57.5 mm and 8.5 mm, respectively. Moreover, the maximum inside and outside forces of steel set are 172.5 MPa and 151.5 MPa. The rock bolt is subjected mainly to a tensile force with a maximum value of up to 29.3 MPa. 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Therefore, this paper presents a historical case of large cross-section tunnel in loose ground, which was excavated by optimal multi-step excavation method. First, to investigate the influence on rock mass deformation by the centre diaphragm (CD) method and optimal tunnelling method, comparative studies were performed by numerical simulation of the hypothetical construction schemes. Then, field monitoring was carried out to further reveal rock mass deformation and structural load characteristics with optimal excavation method. Numerical simulation results show that, compared with CD method, the optimal construction method is more helpful in controlling tunnel invert uplift but has minor disadvantages of increasing horizontal displacement of surrounding rock mass. However, tunnel crown settlement excavated by CD method is approximately similar to that of optimal construction method. 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Therefore, this paper presents a historical case of large cross-section tunnel in loose ground, which was excavated by optimal multi-step excavation method. First, to investigate the influence on rock mass deformation by the centre diaphragm (CD) method and optimal tunnelling method, comparative studies were performed by numerical simulation of the hypothetical construction schemes. Then, field monitoring was carried out to further reveal rock mass deformation and structural load characteristics with optimal excavation method. Numerical simulation results show that, compared with CD method, the optimal construction method is more helpful in controlling tunnel invert uplift but has minor disadvantages of increasing horizontal displacement of surrounding rock mass. However, tunnel crown settlement excavated by CD method is approximately similar to that of optimal construction method. Field test results confirm the effectiveness of optimal tunnelling method on controlling excavation-induced tunnel deformation; the maximum vault settlement and horizontal convergence of drift are approximately 57.5 mm and 8.5 mm, respectively. Moreover, the maximum inside and outside forces of steel set are 172.5 MPa and 151.5 MPa. The rock bolt is subjected mainly to a tensile force with a maximum value of up to 29.3 MPa. Therefore, as the crucial part of initial support structure, steel sets and rock bolts are under appropriate conditions and do not exceed their bearing capacity.</abstract><cop>Cham</cop><pub>Springer International Publishing</pub><doi>10.1007/s12517-020-05961-z</doi></addata></record>
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subjects Approximation
Bearing capacity
Comparative analysis
Comparative studies
Computer simulation
Construction
Construction costs
Cross-sections
Deformation
Deformation effects
Dredging
Earth and Environmental Science
Earth science
Earth Sciences
Excavation
Field tests
Mathematical models
Original Paper
Rock bolts
Rock masses
Rocks
Simulation
Steel
Tunnel construction
Tunneling
Tunnels
Uplift
title Performance of large cross-section tunnel constructed in loose ground by optimal multi-step excavation method
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