波纹钢初期支护结构接头型式力学性能试验研究

Experimental Research on Mechanical Properties of Corrugated Steel Structure Joint of Primary Support

随着地下空间往大空间方向的开发趋势,开挖支护采用传统支护型式往往难以在短时间内形成有效支护。为解决初期支护施作时间过长、早期强度不足等问题,引入波纹钢初期支护,基于足尺波纹钢结构接头模型力学性能试验,针对平法兰、背部加强法兰和搭接3种接头型式的结构应变、螺栓轴力、结构挠度和抗弯刚度展开研究。结果表明:波纹钢初期支护3种接头型式的初始抗弯刚度、抗弯刚度衰减起始弯矩和抗弯刚度衰减速率均有所区别,搭接接头的初始抗弯刚度最大,平法兰接头的抗弯刚度衰减起始弯矩最大,背部加强法兰接头的抗弯刚度衰减速率最慢。

As the trend of underground space moves toward large space,it is often difficult to form effective support in a short period of time for the excavation and support of large underground space using traditional support.In order to solve the problems of too long primary support construction time and insufficient early morning strength,the corrugated steel support is introduced.Based on the full-scale corrugated steel structure joint model mechanical performance test,the structural strain,bolt axial force,structural deflection,and bending stiffness of the three joint types such as flat flange,back reinforced flange,and lap joint are studied.The results show that the initial flexural stiffness,initial bending moment of attenuation of bending stiffness,and decay rate of the three joint types of corrugated steel primary support are different.The initial flexural stiffness of the lap joint is the largest,the attenuation of the bending stiffness of the flat flange joint is the maximum,and the attenuation of flexural stiffness of the back-reinforced flange joint is the minimum.