Study on the optimal shape of biased-pressure tunnel based on rational arch axis
BAI Qiangqiang1，2，CHEN Jian1，2，3，4，5
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. University of Chinese Academy of Sciences，Beijing 100049，China；3. Hubei Key Laboratory of Geo-Environmental Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；4. China-Pakistan Joint Research Center on Earth Sciences，Chinese Academy of Sciences，Islamabad，Pakistan；5. National-Local Joint Engineering Research Center of Underwater Tunnelling Technology，Wuhan，Hubei 430063，China)
Abstract：Biased-pressure tunnel is a typical form of tunnel in engineering，and its cross-section shape can affect the mechanical performance of the lining structure and the stability of the surrounding rock-soil. Aiming at the shape optimization of biased-pressure tunnel，in this paper the investigation on optimal tunnel shape is performed based on the rational arch axis. According to its engineering characteristics，the FEM model of biased-pressure tunnel with initial circular shape is established，and the bending moment and axial force of tunnel lining are calculated to obtain the lining eccentricity. In optimization iterations，the lining axis is gradually approximated to the rational arch axis by repositioning the lining axis continuously，and the optimal cross-section of the biased-pressure tunnel is finally obtained when the eccentricity is approaching its minimum. On this basis，the mechanical performance of the lining and the stress distribution in rock-soil around the tunnel are studied. The results show that this tunnel with the optimal cross-sectional shape has a great improvement in mechanical performance of the lining，which is mainly subjected to axial compression and can fully utilize the compressive properties of the concrete material. Besides，the stress distribution in surrounding rock-soil is smooth and the stress concentration can be avoided effectively.
白强强1，2，陈 健1，2，3，4，5. 基于合理拱轴线的偏压隧道最优断面研究[J]. 岩石力学与工程学报, 2023, 42(S1): 3160-3168.
BAI Qiangqiang1，2，CHEN Jian1，2，3，4，5. Study on the optimal shape of biased-pressure tunnel based on rational arch axis. , 2023, 42(S1): 3160-3168.
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2023, Vol. 42 
