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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。
Concrete lining both viscoelastic properties, but also permeability. In practical engineering, the internal water pressure is borne by lining and pore water. By introducing the stress coefficient related to the volume fraction of pore fluid, the internal water pressure assumed by lining and pore water is reasonably distributed. According to the lining and soil interface lining fluid velocity and fluid velocity in soil equal and stress and displacement continuity conditions established partially permeable boundary conditions. Considering the lining and soil as porous viscoelastic material and liquid-solid two-phase medium respectively, the saturated porous media theory and viscoelastic theory are used to give the saturated viscoelastic saturated soil-lining interaction under internal water pressure Viscoelastic soil displacement, stress and pore pressure and lining displacement and stress analytical expressions. The parameter study shows that the stress coefficient and the relative permeability coefficient of lining and soil greatly influence the dynamic response of the system. In addition, the stress coefficient reasonably determines the value of the internal water pressure borne by the boundary lining and pore water, respectively.