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| Preliminary study on the distribution law and action mode of surrounding rock pressure of shield tunnel |
| HAN Xingbo1, CHEN Ziming1, SU Enjie1, LIANG Xiaoming1, SONG Guifeng2, YE Fei1*
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| (1. School of Highway Engineering, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Yunnan Laman Expressway Co., Ltd., Xishuangbanna 666300, Yunnan, China) |
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Abstract The value of surrounding rock pressure for the design of shield tunnels in China mostly adopts the soil column method or the Terzaghi formula at present. Such formula has good application in the New Austria Tunnelling Method（NATM）tunnel, but its applicability to the calculation of surrounding rock pressure of shield tunnel needs further study. By comparing the field test statistics of the surrounding rock pressure of 23 shield tunnels and 44 NATM tunnels, the relationship between the surrounding rock pressure of shield tunnels and the buried depth, tunnel diameter and stratum type was studied. The difference between the surrounding rock pressure of shield tunnels and the NATM tunnels is analyzed, and the characteristics of the surrounding rock pressure of shield tunnels were further clarified. The applicability of each surrounding rock pressure calculation formula to the shield tunnel was discussed through calculation and analysis. It was found that the surrounding rock pressure of the shield tunnel increased with the buried depth, and the surrounding rock pressure of tunnels in loess and silty clay stratum was obviously less than that in stratum containing sandy soil. The surrounding rock pressure of NATM Tunnel showed an obvious increasing trend with the increase of buried depth and excavation hole diameter. The surrounding rock pressure of the shield tunnel and NATM tunnel was quite different. Due to the timelier lining support of the shield tunnel, the surrounding rock pressure of the shield tunnel was significantly higher than that of the NATM tunnel, and the distribution of surrounding rock pressure along the tunnel perimeter was more uniform. The surrounding rock pressure of the shield tunnel was more inclined to belong to deformation pressure.
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Received: 21 March 2022
Published: 20 April 2022
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