电缆隧道圆形竖井结构设计方法研究

基于各行业规范中没有明确提及圆形竖井设计方法的现状,在进行相关规范解读分析的基础上,对比分析竖井侧压力、国内外规范中提到的圆形水平径向荷载的计算方法,并采用3种结构计算方法对实例进行分析论证,得出合理的结论。结果表明:竖井侧压力采用朗肯土压力计算公式;圆形水平径向荷载引入折减系数,该值为25%;荷载结构法采用主动荷载+被动荷载模式,推荐采用二维荷载结构法设计为主,三维荷载结构法及三维连续介质有限元法设计为辅的设计方法。

Study on Design Method of Circular Vertical Shaft Structure in Cable Tunnel

As the design of circular vertical shaft is not explicitly defined in various industrial standards,the calculation methods of shaft's lateral pressure and circular horizontal radial load in domestic and foreign norms are analyzed and demonstrated based on the interpretation of relevant criteria,and three calculation methods are used to reach some reasonable conclusions. The results show that Rankine earth pressure formula is applicable to calculating lateral pressure of vertical shaft; reduction factor of 25% is introduced into horizontal radial load; 3 the load-structure method adopts active load and passive load pattern. The design method is mainly based on 2D load-structure method assisted by 3D load-structure method and 3D continuum FEM during the process of structure design.