摘要
中洞法在修建大跨度隧道工程中已得到了广泛运用。文章基于大连某中洞法施工的地铁车站,针对中洞法中柱纵向间距、竖向临时支撑曲率和临时支撑刚度对隧道变形、地面变形和支护内力的转换进行了研究分析。分析结果表明:拆除中板以下临时支撑后,中柱纵向间距增大,地面累计沉降量逐渐增大;中柱间距对中柱轴力和初期支护的轴力影响较大,对初期支护弯矩影响较小;采用竖向临时支撑最优曲率半径可使地面变形最小,侧洞开挖是竖向临时支撑内力转换的重要阶段;临时支撑刚度对各点变形和支护结构最终内力影响较小,对其自身内力影响影响较明显。
Considering that the center drift method is widely used in the construction of large-span tunnels and using a subway station utilizing this method in Dalian as an example, the impacts of the longitudinal spacing between two mid-columns, the curvature of the vertical temporary support and the stiffness of the temporary support on tunnel and ground deformations, as well as the inner force transformation of the support, were researched. The results show that： 1） the accumulated ground settlement increases gradually with an increase of mid-column spacing after dismantling the temporary support below the medial plate; 2） the mid-column spacing has more effect onthe axial forces of the mid-column and primary lining, but less effect on the bending moment of primary lining; 3） the minimum ground deformation can be obtained using the optimal curvature radius of the vertical temporary support; 4） side drift excavation plays an important role in the inner force transformation of the vertical temporary support; and 5） the stiffness of the temporary support has less effect on the deformations at various points and the final support inner force, but more effect on its own inner force.
出处
《现代隧道技术》
EI
CSCD
北大核心
2015年第2期59-66,共8页
Modern Tunnelling Technology
基金
教育部项目基本科研业务费项目研究生科研创新项目(N130601004)
关键词
中洞法
中柱间距
竖向临时支撑曲率
临时支撑刚度
Center drift method
Mid-column distance
Curvature of vertical temporary support
Rigidity oftemporary support
