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D-P Yield Criterion Based Elastoplastic Solution for a Deep-buried and Pressured Circular Tunnel Considering Seepage Effect
(1 School of Civil Engineering, Chongqing University, Chongqing 400045; 2 Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, Chongqing University, Chongqing 400045)
Abstract Groundwater is normally rich in the deep-buried mountain tunnels, and the major principal stress of sur? rounding rocks will change under the different conditions of construction and operation stages of the tunnels. In order to study the effect of groundwater seepage, based on D-P yield criterion and considering seepage effect, the elastoplastic solution for the deep-buried and pressured circular tunnel was derived under the condition of plane strain for cases of the major principal stress to be the radial stress and tangential stress. The study shows that the results of DP criterion model are mainly consistent with those of M-C criterion and more conservative; the radial stress and tangential stress are no longer symmetrical with ground stress with an increase of radial distance in the elastic zone considering the effect of seepage, moreover the larger of the seepage pressure the greater of the deviations; under the same condition, the radius of plastic zone increases with an increase of seepage pressure in the stage of low internal water pressure while the radius of plastic zone decreases with an increase of seepage pressure in the stage of high internal water pressure.
Abstract：
Groundwater is normally rich in the deep-buried mountain tunnels, and the major principal stress of sur? rounding rocks will change under the different conditions of construction and operation stages of the tunnels. In order to study the effect of groundwater seepage, based on D-P yield criterion and considering seepage effect, the elastoplastic solution for the deep-buried and pressured circular tunnel was derived under the condition of plane strain for cases of the major principal stress to be the radial stress and tangential stress. The study shows that the results of DP criterion model are mainly consistent with those of M-C criterion and more conservative; the radial stress and tangential stress are no longer symmetrical with ground stress with an increase of radial distance in the elastic zone considering the effect of seepage, moreover the larger of the seepage pressure the greater of the deviations; under the same condition, the radius of plastic zone increases with an increase of seepage pressure in the stage of low internal water pressure while the radius of plastic zone decreases with an increase of seepage pressure in the stage of high internal water pressure.
.D-P Yield Criterion Based Elastoplastic Solution for a Deep-buried and Pressured Circular Tunnel Considering Seepage Effect[J] MODERN TUNNELLING TECHNOLOGY, 2019,V56(1): 39-46
2019, Vol. 56 