科技创新与应用2024，Vol.14Issue(10)：126-129,4.DOI:10.19981/j.CN23-1581/G3.2024.10.031
丽香铁路达落双线中桥增设棚洞结构设计
摘要
Abstract
Based on the middle bridge between the exit of Menggushao Tunnel and the entrance of Qidali Tunnel on Lijiang-Shangrila Railway,this paper analyzes the applicable conditions of conventional open tunnel,flexible steel mesh tunnel,arch bridge tunnel,vertical rigid frame tunnel and horizontal rigid frame tunnel according to the basic conditions of terrain and geological conditions,rock fall weight,slope elevation difference,structural span and protection grade.We selected reasonable shed type and structure size.Conclusion,the detailed investigation and analysis of the weight and height difference of the dangerous rock fall on the tunnel slope is the premise of deciding whether to use the flexible steel mesh shed or the reinforced concrete rigid shed.The span of road direction along the reinforced concrete rigid shed tunnel,the requirements of flood drainage and the integrity of bedrock are the key to determine the specific type of rigid shed tunnel.It is more appropriate to choose the calculation method of the roadbed manual for the rock fall impact strength.The rockfall impact force is considered according to the moving load,and the moving step is considered according to 2 meters.When calculating the internal force and component size of the shed structure,the most unfavorable working conditions should be considered according to the bending moment envelope diagram of different positions of the falling rock.关键词
V型冲沟/增设棚洞/落石冲击/移动步距/丽香铁路Key words
V-shaped trench/additional shed/rock fall impact/moving step/Lijiang-Shangrila Railway分类
交通工程引用本文复制引用
李贵民,郭永发,丁文云,王化武..丽香铁路达落双线中桥增设棚洞结构设计[J].科技创新与应用,2024,14(10):126-129,4.基金项目
云南省科技厅科技计划项目(202303AA080003) （202303AA080003）
