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| Application of seepage analytical solution of surrounding rock based on generalized SMP criterion in circular tunnel |
| YANG Fan
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| No.1 Engineering Development Co., Ltd. of China Railway 14th Bureau Group, Rizhao 276826, Shandong, China |
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Abstract Aims at the situation that the influence of the seepage water pressure of the surrounding rock on the stress and displacement of the surrounding rock of the deep-buried tunnel is not clear, based on the spatial mobilized plane(SMP)strength yield criterion and non-correlated flow law, the elastic-brittle-plastic analytical solutions of tunnel surrounding rock stress and displacement under seepage water pressure were derived, and the effect laws of seepage water pressure and shear dilatation on the displacement and stress of tunnel surrounding rock were analyzed. <b>Results</b> showed that, the infiltration water pressure had a significant effect on the stress and displacement of the surrounding rock. With the increase of the infiltration water pressure, the stress and displacement of each point of the tunnel and the radius of the plastic zone increased, and the greater difference between the water head inside and outside the tunnel, the greater change of the stress, displacement and the plastic zone radius, among these, the plastic zone radius and the infiltrating water pressure had a linear positive correlation. The results of this research are of great significance for accurately determining the seepage water pressure of surrounding rock around the tunnel and ensuring the stability of the surrounding rock.
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Received: 20 January 2022
Published: 20 December 2022
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