- 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: | XIONG Tenggen, WANG Feng, LIU Jixin. Pore Pressure Inversion Model for Tunnel Lining Concrete Spalling Driven by Fire Test Temperature[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20250320
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To accurately quantify and predict the internal pore pressure of tunnel lining concrete at the critical moment of spalling under high fire temperature, fire exposure tests on tunnel lining concrete were conducted. The evolution laws of the transient temperature field and pore pressure of lining concrete specimens during the fire process were obtained. Based on the tests, a “quasi-steady-state” pore pressure inversion model for high-temperature spalling of lining concrete was constructed, using experimental temperature data as the key driver. The reliability of the model was validated by comparing it with experimental results, and the spatial distribution characteristics of pore pressure at the moment of high-temperature spalling were revealed. The results show that for typical tunnel lining concrete specimens with an initial moisture content of 3.50%, at the critical moment of spalling under the HC fire condition, the pore pressure value ranges from 0.79 MPa to 0.96 MPa, with an average value of 0.88 MPa. The pore pressure value predicted by the model ranges from 0.91 MPa to 1.13 MPa, with an average of 0.99 MPa. The peak pore pressure predicted by the model agrees well with the experimental data, with errors ranging from 2.08% to 28.41% and an average error of 15.23%, which is lower than 20%. The pore pressure along the depth direction from the heated surface at the high-temperature spalling moment exhibits a “hump-shaped” spatial distribution, which can be resolved into the thermal cracking zone, the pore pressure concentration zone, and the thermodynamic equilibrium zone.
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