In order to explore the reliability and spacing of rock columns in large-span tunnels,the study takes the Da-ping Tunnel in Chongqing as an example to analyze the stress characteristics,introduces the Drucker Prager criterion as the rock failure criterion,sets intermediate arrangement points on the tunnel and the rock columns for data collection,and finally calculates the reliability and spacing correlation of the rock columns.The experimental results show that in the tunnel section without broadband,the reliability of 6 positions in the left tunnel is lower than 0.875;When the spacing changes,the maximum reliability of support excavation is 0.385 at a 3m spacing,and increases to 0.795 when the spac-ing reaches 11m.The above results indicate that the research method can effectively analyze the reliability of large-span tunnels,and the burial depth and spacing have a significant impact on the reliability of the tunnel.
关键词
中夹岩柱/可靠度分析/Drucker-Prager准则/受力特征分析
Key words
Intermediate rock pillar/Reliability analysis/Drucker Prager criterion/Analysis of force characteristics
维普
万方数据