作　　者： (张臻）; (廖志鹏）; (房海勃）;

机构地区： 陕西省交通规划设计研究院,西安710065

出　　处： 《建筑技术》 2017年第9期944-946,共3页

摘　　要： 结合某公路隧道浅埋暗挖施工方案,对软土地区浅埋大断面隧道下穿既有高速公路的施工过程进行数值计算,通过分析围岩变形和受力状态评价施工方案的安全可靠性。计算结果证明双侧壁导坑法对控制围岩变形有较好效果,但临时支护拆除时轴力及弯矩较大,特别是拱脚和墙角位置应加强监控量测并采取必要的补强措施。 Combing with the shallow subsurface-excavated construction scheme of a highway tunnel, in this paper, numerical calculation is performed for construction process of existing highway above the shallow tunnel with large cross-section in soft soil area, and the surrounding rock and stress state is analyzed to evaluate the safety and reality of the construction scheme. The calculation result indicates that the two-side wall pilot construction method has a good effect in controlling the surrounding rock deformation, however, large axial force and bending moment are generated in arch spring and comer when removing the temporary support. Therefore, monitoring and measurement should be strengthened and necessary reinforcement measures should be taken.

关 键 词： 隧道 下穿高速公路 双侧壁导坑法