不同隧道开挖方式对连拱隧道稳定性的研究  

Study on Stability of Multi-arch Tunnel with Different Tunnel Excavation Methods

作　　者：罗健 贺春宁 金宇轩 LUO Jian;HE Chunning;JIN Yuxuan(Hunan Chenglong Expressway Construction and Development Co.,Ltd.,Changsha,Hunan 410024,China;Hunan Communications Research Institute Co.,Ltd.,Changsha,Hunan 410114,China)

机构地区：[1]湖南省城龙高速公路建设开发有限公司,湖南长沙410024 [2]湖南省交通科学研究院有限公司,湖南长沙410114

出　　处：《公路工程》2024年第3期42-48,95,共8页Highway Engineering

基　　金：湖南省交通运输厅科技进步与创新项目(NO.202303-2)。

摘　　要：以湖南某公路隧道为工程背景,利用FLAC 3D对不同开挖方式的施工过程进行模拟计算,研究了不同开挖方式对围岩稳定性的影响。研究表明:①隧道的拱顶及仰拱两侧极易出现裂缝,应加强支护;②隧道开挖方式对围岩稳定影响巨大,应根据工程地质条件、施工条件等因素选择合适的隧道开挖方法;③三导洞法开挖相比于全断面开挖法,能较好地控制围岩变形及变形速率,有效地限制围岩塑性区的发展.This paper uses FLAC 3D to simulate the construction process of different excavation methods,and studies the influence of different excavation methods on the stability of surrounding rock.The research shows that:①Cracks are easy to appear on both sides of the arch crown and inverted arch of the tunnel,and the support should be strengthened;②The tunnel excavation method has a great impact on the stability of surrounding rock,so the appropriate tunnel excavation method should be selected according to the engineering geological conditions,construction conditions and other factors;③Compared with the full face excavation method,the three pilot tunnel excavation method can better control the deformation and deformation rate of surrounding rock and effectively limit the development of plastic zone of surrounding rock.

关 键 词：隧道 围岩稳定 隧道开挖 数值模拟 三导洞开挖法 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]