摘要
以福建省漳州至永安高速公路大隔尖隧道为工程背景,采用数值分析方法,研究了不同深跨比下浅埋偏压隧道地表变形规律。研究发现,浅埋偏压隧道开挖对地表的影响范围大小与隧道埋深成反比,隧道埋深越大,隧道开挖对地表影响越小。当单线和双线隧道深跨比分别为3.1和2.7时,隧道正上方地表已经几乎不受隧道开挖的影响。因此在工程施工中,对于浅埋偏压隧道而言,埋深越浅,越应重视施工对地表变形的影响,可以通过在地表一定范围内注浆来减小隧道开挖对地表的影响程度。
With the Dagejian Tunnel of the Zhangzhou-Yong＇an Expressway in Fujian Province as the engineering background, the numerical analysis method is applied to studying the law of the ground deformation over a shallow tunnel of different depthspan ratios under unsymmetrical loads in the paper. Our study shows that the size of the influential range of the effect of the excavation of the bias-pressured tunnel on the ground deformation is inversely proportional to the buried depth of the tunnel. The greater the buried depth of the tunnel is, the smaller the effect of the excavation of the tuunel on the ground deformation will be. When the depth-span ratios of a single-line tunnel and a dual--line tunnel are respectively 3.1 and 2.7, the ground right over the tunnel will nearly not be affected by the excavation of the tunnel. Therefore,as far as a shallow tunnel is concerned, in the course of construction, the shallower the buried depth of the tunnel is,the greater attention should be paid to the effect of the construction on the ground deformation. And the effect of the excavation of the tunnel on the ground deformation may be re- duced by means of slip-casting concrete within a certain range of the ground.
出处
《国防交通工程与技术》
2016年第6期58-60,52,共4页
Traffic Engineering and Technology for National Defence
关键词
浅埋偏压隧道
深跨比
地表变形
数值分析
shallow tunnel under unsymmetrical loads
depth-span ratio
ground deformation
numerical analysis
