基于合理拱轴线的偏压隧道最优断面研究

doi:10.13722/j.cnki.jrme.2022.0057

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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.

Key words： tunnelling engineering rational arch axis optimal tunnel shape eccentricity asymptotic iterative optimization

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	BAI Qiangqiang1
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	CHEN Jian1
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Cite this article:

BAI Qiangqiang1,2,CHEN Jian1, et al. Study on the optimal shape of biased-pressure tunnel based on rational arch axis[J]. , 2023, 42(S1): 3160-3168.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0057 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/IS1/3160

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