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| Research and prospect of demarcation of deep and shallow buried in loess tunnel |
| SONG Zhanping1,2,3, LIU Yanlong1, ZHANG Yuwei1,2,3
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1. School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, Shaanxi, China;
2. Shaanxi Key Laboratory of Geotechnical and Underground Space, Xi'an 710055, Shaanxi, China;
3. Institute of Tunnel and Underground Structure Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, Shaanxi, China |
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Abstract In order to fully study the research progress of the delimitation of deep and shallow loess tunnels, the research status of the delimitation of deep and shallow loess tunnels was described from four aspects: theoretical research, numerical simulation, model test and actual measurement analysis. The results showed that: the theoretical research was mostly based on the study and analysis of the changes in surrounding rock pressure and deformation pressure with the buried depth of the tunnel, and the best limit value was found in the changing rules; the numerical simulation was mostly to study the deformation and settlement laws of tunnels with different buried depths, the results were relatively intuitive, and the tunnel force and deformation could be analyzed intuitively; the model test was mainly to carry out the gravity similar simulation test on different buried depth tunnels, which could analyze the force status of the actual project; the actual measurement analysis was based on the on-site statistical results for analysis, according to experience, the boundary value of the depth of the tunnel was delineated. Based on the analysis of the four methods of dividing the depth of the loess tunnel, the factors considered when dividing the boundary between deep and shallow burial was summarized, and the problems in the existing research such as the inaccurate division of the buried depth of the tunnel and the large range of the obtained buried depth were pointed out. In combination with the engineering characteristics of the loess tunnel, it was suggested to use the improved XIE Jiaxiao Maximum Method to calculate the depth and shallow burial limit of the loess tunnel.
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Received: 05 March 2021
Published: 20 June 2021
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