- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | ZHANG Jian, YAN Songhong, WANG Wen, SUN Weiyu. Theoretical Analysis of Bearing Mechanism of Pipe Sheds[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230425
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Establishing a reasonable and accurate theoretical analysis model for pipe sheds and solving it are of great significance to promoting the development of pipe shed pre-support technology. By analyzing the construction process of tunnel excavation and support and the reduction of the restraining reaction force of the pipe shed due to the disturbance of the tunnel face in the unexcavated section, a load structure model of the pipe shed based on the Euler-Bernoulli beam theory was established. The Pasternak elastic foundation model was introduced to determine the initial support and the restraining reaction force of the rock mass in front of the tunnel face on the pipe shed, and the analytical expressions of the stress and deformation of the pipe shed during each cycle of tunnel excavation and support were derived. In addition, the superposition method was used to solve the stress and deformation distribution of the pipe shed when the tunnel face was tunneled to any position. Through case comparison, the rationality and effectiveness of the model were verified. The research results show that smaller circumferential spacing and larger diameter of the pipe shed steel pipes are helpful in improving the pre-reinforcement capacity of the pipe shed, and the reasonable lap length of the pipe shed is 1.8 m.
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