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Study on bearing capacity of combined confined concrete arch in large-section tunnel

  • Jiang Bei (State Key Laboratory for Tunnel Engineering, China University of Mining & Technology-Beijing) ;
  • Xu Shuo (State Key Laboratory for Tunnel Engineering, China University of Mining & Technology-Beijing) ;
  • Wang Qi (State Key Laboratory for Tunnel Engineering, China University of Mining & Technology-Beijing) ;
  • Xin Zhong Xin (Geotechnical and Structural Engineering Research Center, Shandong University) ;
  • Wei Hua Yong (State Key Laboratory for Tunnel Engineering, China University of Mining & Technology-Beijing) ;
  • Ma Feng Lin (State Key Laboratory for Tunnel Engineering, China University of Mining & Technology-Beijing)
  • Received : 2022.04.19
  • Accepted : 2024.04.03
  • Published : 2024.04.25
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Abstract

There are many challenges in the construction of large-section tunnels, such as extremely soft rock and fractured zones. In order to solve these problems, the confined concrete support technology is proposed to control the surrounding rocks. The large-scale laboratory test is carried out to clarify mechanical behaviours of the combined confined concrete and traditional I-steel arches. The test results show that the bearing capacity of combined confined concrete arch is 3217.5 kN, which is 3.12 times that of the combined I-steel arch. The optimum design method is proposed to select reasonable design parameters for confined concrete arch. The parametric finite element (FE) analysis is carried out to study the effect of the design factors via optimum design method. The steel pipe wall thickness and the longitudinal connection ring spacing have a significant effect on the bearing capacity of the combined confined concrete arch. Based on the above research, the confined concrete support technology is applied on site. The field monitoring results shows that the arch has an excellent control effect on the surrounding rock deformation. The results of this research provide a reference for the support design of surrounding rocks in large-section tunnels.

Keywords

Acknowledgement

This work was supported by the National Key Research and Development Program of China (Grant No. 2023YFC3805700); the National Natural Science Foundation of China (Grant Nos. 42077267 and 42277174 and 52074164); the Natural Science Foundation of Shandong Province, China (Grant No. ZR2020JQ23). China University of Mining and Technology (Beijing) Top Innovative Talent Cultivation Fund for Doctoral Students (Grant No. BBJ2023048).

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