超浅埋超大跨连拱隧道围岩压力研究  

Study on Surrounding Rock Pressure of Ultra-shallow Buried Super-large Span Multi-arch Tunnel

作　　者：易铭 王浩 傅鹤林[3] 易海东 黎固 Yi Ming;Wang Hao;Fu Helin;Yi Haidong;Li Gu(Yueyang City Operation Investment Group Co.,Ltd.,Yueyang 414022,Hunan,China;Minmetals 23 Metallurgical Construction Group Co.,Ltd.,Changsha 425399,China;Central South University,Changsha 410075,China)

机构地区：[1]岳阳市城市运营投资集团有限公司,湖南岳阳414022 [2]五矿二十三冶建设集团有限公司,长沙425399 [3]中南大学,长沙410075

出　　处：《科技通报》2024年第11期88-95,共8页Bulletin of Science and Technology

基　　金：湖南省教育厅重点课题(23A0014)。

摘　　要：为准确估算超浅埋超大跨连拱隧道的围岩压力,本文将变坡点引入传统围岩压力计算模型,根据实际地形情况,建立了来米坡隧道入洞口围岩压力计算模型。基于极限平衡理论,分析各坡块受力情况,假定围岩压力分布形式,最终获得围岩压力分布情况。基于现场地质情况,建立地层结构模型,获得二衬表面应力进行对比分析,结果表明:(1)将变坡点引入围岩压力计算模型中可以适用于超大跨围岩的复杂地形情况,获得更拟合实际坡面的计算模型;(2)极限平衡理论的计算结果与数值结果有较高的拟合度,将变坡点引入传统计算模型是可行的;(3)围岩压力计算结果显示隧道拱脚和中隔墙顶存在较大应力,施工时应注意支护。In order to accurately estimate the surrounding rock pressure of ultra-shallow buried super-large span arch tunnels,the traditional surrounding rock pressure calculation model is introduced into the variable slope point,and the surrounding rock pressure calculation model is established according to the actual terrain.Based on the limit equilibrium theory,the stress situation of each slope block is analyzed,and the pressure distribution form of surrounding rock is assumed.Based on the site geological conditions,the formation structure model is established,and the surface stress of the secondary lining is obtained for comparative analysis.The results show that:(1)The introduction of variable slope points into the calculation model of surrounding rock pressure can be applied to the complicated terrain of large span surrounding rock,and the calculation model of actual slope can be obtained better;(2)The calculation results of the limit equilibrium theory have a high degree of fit with the numerical results,and it is feasible to introduce the variable slope points into the traditional calculation model;(3)The calculation results of surrounding rock pressure show that there is a large stress at the top of the tunnel arch foot and the middle partition wall,and attention should be paid to the support during construction.

关 键 词：围岩压力 连拱隧道 极限平衡 变坡面 

分 类 号：U451[建筑科学—桥梁与隧道工程]