管棚法施工中格栅支护机理分析

以杭州机场路人行过街地道为背景，为研究管棚荷载传递规律，建立双参数弹性地基梁模型，选取受力最危险的一榀格栅，通过有限元软件建立荷载一结构模型分析开挖对该榀格栅内力的影响。研究结果表明：紧邻开挖面的第一榀格栅所承担的荷栽能占到开挖荷载的70％左右，是开挖荷载的主要承受构件；相对格栅拱架底部和横向支撑，拱架顶部和竖向支撑承受了相当大的应力为主要的受力部分，以便控制掌子面向内部净空的挤压变形。

An Analysis of Support Mechanism of Grating in Pipe-roof Reinforcement

Based on underground passage of Hangzhou Airport Road, the double-parameter elastic foundation beam model is established to study the laws of the load redistribution of pipe-roofmg. Choosing the load-beating grating that is the most dangerous, the finite dement model is established to analyze the influence on the internal forces of grating. The results indicate that the first grating adjacent to the excavation surface accounts for about 70% of excavation loads, which is the main load-bearing component for the bottom grating and lateral support. The top and vertical supports withstand considerable stress in order to control the compressive deformation of the internal clearance.