软弱地层管棚作用特性判别和分析  

the Function Discrimination of Pipe Roof Applied in Soft Ground

作　　者：董新平[1] 胡新朋[2] 周顺华[1] 

机构地区：[1]同济大学,上海200331 [2]中铁隧道集团,洛阳400791

出　　处：《地下空间与工程学报》2006年第4期631-634,653,共5页Chinese Journal of Underground Space and Engineering

基　　金：上海申通集团有限公司资助项目(050326)

摘　　要：提出了判别管棚作用特性的方法,推导了用以甄别管棚作用的解析表达式,以软弱地层中的两个隧道工程特别施工阶段为案例,对管棚的作用特性进行了详细分析,分析表明,在开挖跨度、管棚直径和长度不同条件下,管棚作用特性不尽相同,即:就目前我国国内采用的小直径管棚而言,管棚作用可分为传递荷载或承受荷载;管棚作用特性主要取决于管棚与支护结构的相对刚度比;当管棚主要起到荷载传递作用时,管径变化对体系内力分配和分布影响不显著,而当管棚作为承载构件时,则管径变化影响显著。Using the Fourier series Method, the analytical solution of the beam resting on the elastic foundation with discontinuous foundation modulus is developed. According to the application of the pipe roof method in subway in urban soft ground, the analysis model for different construetion phase is presented. Based on the analytical solution of beam on foundation, the function of pipe roof in two phases, namely when the supports are completed and the temporality vertical supports are removed, is analyzed. The analysis results demonstrated that the function of pipe roof is dependent on the relative stiffness ratio of pipe with support（namely： steel arch and mesh shot concrete） . Meanwhile, the effect of diameter of pipe roof on its function is analyzed.

关 键 词：地下工程 弹性地基梁 管棚法 富里叶级数 

分 类 号：TU473.2[建筑科学—结构工程]