软岩隧道初支拱架S形变形原因分析及对策  

On analysis of reasons and countermeasure of S-shaped initial lagging jack of soft rock tunnel

作　　者：李占先[1] 

机构地区：[1]中铁十四局集团有限公司,山东济南250014

出　　处：《山西建筑》2014年第17期175-176,共2页Shanxi Architecture

摘　　要：围绕云桂铁路软弱隧道的初支"S"形变形,通过力学、支护、监测与数值模拟对比分析,研究了隧道初期支护中钢拱架"S"形变形的原因,得出围岩应力分布不同时,必然会导致不均匀变形来释放应力,钢拱架连接钢板以上50 cm^150 cm范围内,钢架刚度不足会呈现"S"形变形的结论。On the initial support S-shaped deformation of weak tunnel along Kunming-Nanning Railway,the paper researches the reasons for the deformation of the S-shaped steel lagging jack in the tunnel initial support by the comparison and analysis of the dynamics,the support,the super-vision and the numeric simulation,concludes the stress can be released in the uneven deformation caused by the various stress distribution of sur-rounding rock,and concludes the insufficient steel structure strength leads to the S-shaped deformation when the steel lagging jack continuous steel plate between 50 cm ~ 150 cm.

关 键 词：软岩隧道 钢拱架 “S”形变形 变形分析 

分 类 号：U452.12[建筑科学—桥梁与隧道工程]