内水压作用下粘弹性饱和土-隧洞衬砌相互作用

INTERACTION OF VISCOELASTIC SATURATED SOIL AND TUNNEL LINING SUBJECT TO ININER WATER PRESSURE

  • 摘要: 混凝土衬砌既有粘弹性性质,又有渗透性。实际工程中内水压力值由衬砌和孔隙水共同承担,该文通过引入与孔隙流体体积分数有关的应力系数合理地分配了衬砌和孔隙水分别承担的内水压力值。根据衬砌和土体界面处衬砌中流体速度和土体中流体速度相等以及应力和位移连续性条件建立了部分透水边界条件。将衬砌和土体分别视为多孔粘弹性材料和液固两相介质,采用饱和多孔介质理论和粘弹性理论,在频率域内给出了内水压力作用下粘弹性饱和土-衬砌相互作用时饱和粘弹性土位移、应力和孔压和衬砌的位移和应力解析表达式。进行了参数研究,表明:应力系数以及衬砌和土体相对渗透系数对系统动力响应影响很大。另外,应力系数合理地确定了边界衬砌和孔隙水分别承担的内水压力值。

     

    Abstract: The concrete lining has viscoelastic properties and permeability. The inner water pressure is partly undertaken by the lining and partly balanced by pore water pressure; it depends on the stress coefficient related to the volume fraction of pore fluid. According to the fluid velocity equality at the interface of lining and soil, and continuity condition of the stress and displacement, the boundary conditions of partially permeability are established. Treating the lining and soil as porous viscoelastic material and two phase medium for liquid-solid respectively, adopting saturated porous medium and viscoelastic theory, this paper developed the analytical expressions for the displacement, stress and pore water pressure of saturated viscoelastic soil subjected to the inner water pressure in the frequency domain, as well as the displacement and stress of lining under the interaction of saturated viscoelastic soil and lining. Parametric study shows that, the stress coefficient and the relative permeability coefficient of the lining and soil have remarkable influence on the system dynamic response. In addition, the inner water pressure undertaken by the boundary lining and pore water can be determined by the stress coefficient.

     

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