水工隧洞内水外渗耦合分析

Analysis of hydro-mechanical interaction in hydraulic tunnel with inner water exosmosis

在水荷载体力理论的基础上,引入钢筋应变不均匀系数和混凝土应变不均匀系数。计算衬砌渗透系数,引入反映钢筋混凝土衬砌与围岩有条件联合承载特性的充水夹层单元模型,采用等效耦合分析方法,对水工隧洞内水外渗条件下的衬砌钢筋应力和围岩应力状态进行了计算分析。计算结果表明,与考虑衬砌与围岩完全联合承载的耦合分析方法相比,钢筋应力有了较大幅度的降低,在一定程度上反映了钢筋混凝土衬砌高压隧洞运行过程中钢筋应力水平普遍较低的这一工程特性。

Given water load as a kind of body load, the nonuniformity coefficients of reinforcement strain and concrete strain are introduced to compute the lining＇s permeability coefficient. A water-filled joint element is developed to simulate the limited cooperation between reinforced concrete lining and surrounding rock; and an equivalent method is adopted to develop the program, The reinforcement stress and the rock stresses in hydraulic tunnel with inner water exosmosis are calculated. The results show that the reinforcement stress obtained by the new method is smaller than that of the traditional method. The fact that the reinforcement stress in the reinforced concrete tunnel under high inner water load is in a lower level, is verified.