高压引水隧洞衬砌配筋简化算法  

Simplified Calculation of Reinforcement Arrangement for Lining of High-pressure Headrace Tunnel

作　　者：张帆[1] 詹振彪[1] 屈洁[1] 

机构地区：[1]中国电建集团西北勘测设计研究院有限公司,西安710065

出　　处：《西北水电》2016年第2期33-37,共5页Northwest Hydropower

摘　　要：国外规范一般采用弹性力学方法进行引水隧洞衬砌结构设计,虽考虑了部分外水压力,但仍基于不透水衬砌设计,按照面力理论计算,这将会导致过高的配筋量。实际工程中,在高内水压力作用下,衬砌已发生开裂,运行期内水外渗,检修期外水也将沿着裂缝渗入洞内,采用面力理论已不能反映内外水的相互作用,更难真实地模拟隧洞与围岩介质中稳定的渗流场。文章采用开裂设计方法,通过考虑渗流作用,总结出一套适用于高水头电站衬砌非线性计算的简化算法。The elastic mechanics method in foreign specification is applied for design of the lining structure of headrace tunnel. Partial external hydraulic pressure is considered,but the lining is still designed based on impermeability and calculation is performed by surface force theory. Those result in arrangement of reinforcement in a high quantity. In practice,the lining is already cracked by action of the high internal hydraulic pressure. In operation period,the internal water seeps outward. In repair period,the external water seeps inside the tunnel along cracks. Therefore,application of the surface force theory cannot explain the interaction of internal and external water. It is difficult to simulate the stable seepage fields in tunnel and surrounding- rock media. In this paper,the design method with consideration of cracks is applied. Considering the seepage action,the simplified method of the nonlinear calculation applicable for design of lining of the high- head hydropower project is proposed.

关 键 词：弹性力学 钢筋混凝土衬砌 渗流场 非线性计算 

分 类 号：TV672.1[水利工程—水利水电工程]