Application of Pipe Shed Support in the Treatment of Tunnel Collapse and Roof Fall
Taking a tunnel project in Anhui Province as the background,aiming at the problem of collapse and roof fall encountered in tunnel construction,this paper analyzes its causes from the perspective of geological con-ditions and climatic conditions,and puts forward the treatment countermeasures with pipe shed support reinforce-ment as the core.By selecting advanced large pipe shed to pass through the collapsed body,the pipe shed grout-ing reinforcement technology is used to improve the surrounding rock grade and form a reinforcement circle to ensure that the reinforcement area of the collapsed roof can withstand the load of the surrounding rock at the top.At the same time,the initial support was reinforced in the collapsed section,and the three-step excavation method was adopted.Combined with the data of on-site surrounding rock moisture content monitoring and con-struction monitoring measurement,it successfully crosses the complex geological area.The later monitoring and measurement data show that the maximum change rates of the vault subsidence and the displacement around the arch waist are 0.7 mm/d and 0.9 mm/d,respectively,and the cumulative displacement values are 7.6 mm and 8.2 mm,respectively.The pipe shed support measures effectively control the deformation of surrounding rock and pro-vide stable support for excavation,thus ensuring the safety of construction.The research results can provide useful reference for similar projects.
tunnel engineeringpipe shed supportcollapse and roof fallconstruction technique
万方数据
维普
