Study on Stress Field and Security of Primary Support in High Rock Temperature Tunnel

TANG Xinghua; WANG Mingnian; TONG Jianjun; DONG Congyu; ZHANG Chong

doi:10.3969/j.issn.0258-2724.20150958

Volume 54 Issue 1

Feb. 2019

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Journal of Southwest Jiaotong University > 2019 > 54(1): 32-38.

REN Zizhen, CEN Minyi, ZHANG Tonggang, ZHOU Guoqing. Building Extraction from LIDAR Data Based on Shape Analysis of Contours[J]. Journal of Southwest Jiaotong University, 2009, 22(1): 83-88.

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TANG Xinghua, WANG Mingnian, TONG Jianjun, DONG Congyu, ZHANG Chong. Study on Stress Field and Security of Primary Support in High Rock Temperature Tunnel[J]. Journal of Southwest Jiaotong University, 2019, 54(1): 32-38. doi: 10.3969/j.issn.0258-2724.20150958

REN Zizhen, CEN Minyi, ZHANG Tonggang, ZHOU Guoqing. Building Extraction from LIDAR Data Based on Shape Analysis of Contours[J]. Journal of Southwest Jiaotong University, 2009, 22(1): 83-88.

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Study on Stress Field and Security of Primary Support in High Rock Temperature Tunnel

doi: 10.3969/j.issn.0258-2724.20150958

TANG Xinghua^{1,2
,},
WANG Mingnian^1,2,
TONG Jianjun^{1,2
,
,},
DONG Congyu^1,2,
ZHANG Chong³

Received Date: 04 Dec 2015
Rev Recd Date: 06 Dec 2017

Available Online: 06 Jun 2018

Publish Date: 01 Feb 2019

Abstract

Abstract

The characteristics and changing behaviour of the initial support in high rock temperature tunnel were studied to evaluate security during the construction process. First, the temperature field of the initial support was analysed during the construction process of high rock temperature tunnel by using thermal-stress coupling numerical simulations and in-situ testing. Second, the stress field of the initial support, which bore the rock load and temperature load, was analysed over the construction process of high rock temperature tunnel. Finally, based on the stress of primary support, the security of primary support in high rock temperature tunnel was evaluated. The results show that the temperature of primary support sharply decreases after tunnel excavation and is equivalent to the air temperature in the tunnel after about 5 days. During the construction process, the maximum tensile stress of primary support first increases and then decreases. However, the maximum compressive stress always increases. With increased initial rock temperature, the maximum tensile and compressive stress of the primary support also increase. The security of the primary support depends on the tensile strength of shotcrete, and the C25 shotcrete will be damaged if the initial rock temperature exceeds 60℃.
- high rock temperature tunnel,
- initial support,
- tensile stress,
- compressive stress,
- security

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References

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