软岩大变形隧道的围岩级别判识方法及处治优化

The Judgement Method of Surrounding Rock Grade in Soft Rock with Large Deformation and Treatment Optimization

对于山岭隧道软岩大变形地段,进行围岩级别判定对指导隧道安全施工有着极其重要的作用。利用TSP、地质雷达、瞬变电磁等综合探测方法对红岩寺隧道软岩地段进行围岩级别初步辨识,然后基于属性综合模型进行围岩级别数学方法二次评价。开挖后ZK20＋839-ZK20＋835段发生大变形,判断围岩级别为Ⅴ级,现场实际揭露情况与探测结果、二次评价结果吻合。基于数值模拟软件,从开挖断面、开挖方法、钢拱架、锚杆、注浆加固等方面进行参数优化。通过大变形段的补强监测,表明采用此方法处理隧道大变形效果良好。

For the tunnel section of soft rock with large deformation,judging the surrounding rock grade plays an extremely important role in guiding the construction. The comprehensive forecasting method including TSP,Radar,transient electromagnetic was used to preliminarily identify the grade of soft rock with large deformation in Hongyansi Tunnel,which was secondly evaluated based on attribute comprehensive model. The large deformation of ZK20 ＋ 839 - ZK20 ＋ 835 where the grade was recognized as Ⅴhappened. The field-observed result is generally in good agreement with prediction result and assessment result. Base on numerical simulation software,the parameter of excavation section,excavation method,steel arch,anchor and grouting was optimized. The approach proved by analysis of reinforcing monitoring at the section of large deformation had a good effect.