大跨度隧道中夹岩柱可靠度与间距研究  

Research on the reliability and spacing of rock columns in large-span tunnels

作　　者：李海兵 李新钊 严盛 LI Hai-bing;LI Xin-zhao;YAN Sheng(China Construction Communications Construction Group Co.,Ltd.,Hubei,Wuhan 430000)

机构地区：[1]中建交通建设集团有限公司,湖北武汉430000

出　　处：《贵阳学院学报（自然科学版）》2024年第1期100-104,共5页Journal of Guiyang University：Natural Sciences

摘　　要：为探究大跨度隧道中夹岩柱的可靠度与间距问题,以重庆的大坪隧道作为示例,进行受力特征分析,引入Drucker-Prager准则作为岩石的破坏准则,在隧道及中夹岩柱上设置中间布置点进行数据采集,最后计算出中夹岩柱的可靠性和间距关联。实验结果表明,在不加宽带隧道段中,左洞有6个位置点的可靠度低于0.875;在间距变化时,支护开挖可靠度在3 m间距的最大可靠度为0.385,间距达到11 m时增加到0.795。以上结果表明,研究方法能够有效地对大跨度隧道的可靠度进行分析,埋深、间距皆对隧道可靠度有较大影响。In order to explore the reliability and spacing of rock columns in large-span tunnels,the study takes the Daping 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 spacing 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 

分 类 号：U45[建筑科学—桥梁与隧道工程]