摘要
针对既有硐室交叉段扩建施工稳定性难题,采用数值方案比选和室内试验方法,探究扩建硐室多次扰动与初期支护结构相互作用关系,提出了一种应用于硐室交叉段的Y字形主骨架+斜截断拱架的新型钢拱架支护方式,通过Y字形主拱架承受上部围岩的应力,斜截段拱架将增加主拱架的相互约束,以提高主拱架弱平面的抗弯刚度,增强初期支护新型结构稳定性。通过现场试验段验证,给出了新型钢拱架设计参数。
Based on the study on the support methods of cross tunnels at home and abroad and combined with the actual engineering, according to the mechanical characteristics of the cross section of the cave, a Y shaped main skeleton + oblique truncated arch used in the cross section of the cave is proposed. The new steel arch support method supports the stress of the upper surrounding rock through the Y shaped main arch. The oblique section arch will increase the mutual restraint of the main arch,increase the bending rigidity of the weak plan of the main arch,and enhance the stability of the entire support structure. The design parameters of the new steel arch are given by the field test.
作者
刘永明
LIU Yongming(China Railway(Guizhou)Municipal Engineering Co.,Ltd.,Guiyang,Guizhou550000,China)
出处
《施工技术》
CAS
2021年第11期99-102,107,共5页
Construction Technology
基金
贵州省科技厅2020年度贵州省基础研究计划(黔科合基础[2020]1Y250)
中国博士后科学基金面上项目(2017M622929)。
关键词
地下工程
交叉硐室
素混凝土
钢拱架
抗弯承载力
试验
underground buildings
cross cavern
plain concrete
steel arch frame
flexural bearing capacity
testing
