球墨铸铁-钢筋混凝土组合隧道壁板加载试验分析

Experimental Analysis on Mechanical Behaviors of the Nodular Cast Iron-Reinforced Concrete Composite Tunnel Liner Slab under Loading

为研究球墨铸铁-钢筋混凝土组合隧道壁板这一新技术应用于隧道衬砌结构的可行性,文章根据相关设计参数,采用三维有限元分析方法模拟试验加载环境,建立分析模型,研究荷载条件下组合壁板的受力特征。分析结果表明:当混凝土达到极限状态受压破坏时组合壁板能承受的竖向压力为2.22 MPa,水平压力为1.11 MPa,拱顶为最大变形处,最大变形为6.63 mm;当球墨铸铁达到极限状态受压破坏时组合壁板能承受的竖向压力为11.48 MPa,水平压力为5.74 MPa,拱顶为最大变形处,最大变形为33.16 mm;在球墨铸铁壁板环作用下组合壁板相比混凝土受压坏破坏时所能承受围岩压力的能力和变形能力都提高了5倍,充分体现了球墨铸铁强度高、延性好的优点。

In order to study the application feasibility of the nodular cast iron-reinforced concrete composite liner slab as the tunnel lining structure,a three-dimensional finite element analysis method is used to simulate the load⁃ing environment of the test,and analyze the mechanical characteristics of the composite liner slab under loading.The analysis results show that when the concrete component reaches the ultimate state of compression failure,the composite liner slab can withstand the vertical pressure of 2.22 MPa and the horizontal pressure of 1.11 MPa,the maximum deformation occurs at the arch crown with the value of 6.63 mm;when the nodular cast iron component reaches the ultimate state of compression failure,the composite liner slab can withstand the vertical pressure of 11.48 MPa and the horizontal pressure of 5.74 MPa,the maximum deformation occurs at the arch crown with the val⁃ue of 33.16 mm;under the effect of the nodular cast iron liner slab ring,the composite liner slab's ability to with⁃stand the surrounding rock pressure and anti-deformation capacity are increased by 5 times compared with that of concrete liner slab under compression failure,which fully reflects the advantages of high strength and high ductility of the nodular cast iron.