透水理论在新疆某高压隧洞混凝土衬砌结构设计中的应用

Application of Water Permeable Theory in Design of Concrete Lining Structure of A High Pressure Tunnel in Xinjiang

鉴于在高水头作用下,采用面力理论设计高压混凝土衬砌结构时存在衬砌厚度过大、含筋率超标严重的问题,以体积力的形式将内水压力施加于混凝土衬砌和围岩,通过建立透水衬砌理论数值计算模型,分析混凝土衬砌的应力应变关系,并按照规范进行限裂配筋。将该方法应用于新疆某水电站发电洞衬砌设计中,并与面力理论的计算结果进行对比,发现采用透水衬砌理论设计高压隧洞的混凝土的配筋量明显减小,降低了工程投入成本。

When the surface force theory was used to design high pressure concrete lining structure under action of high water head,there exists problems that lining thickness is too large as well as the reinforcement ratio exceeds the standard.The internal pressure volume force was imposed on the concrete lining and surrounding rock.The numerical calculation model of permeable lining was established to analyze the relationship between concrete lining stress and strain.According to the standard,the limited crack reinforcement was implemented.The method is applied to the tunnel lining design of a hydropower station in Xinjiang,and it is compared with the calculation results obtained by the theory of plane force.It is found that the reinforcement amount of concrete with high permeability tunnel is obviously decreased and the cost of project input is reduced.