摘要
双向八车道隧道开挖断面大,扁平率低,结构受力复杂,洞间相互影响显著,且目前已有工程实例甚少,技术研究尚处于初步阶段,无论从设计还是施工,均未形成完整的配套技术.本文以泉州高山岩2#和3#主线隧道为工程依托,通过有限元软件对其施工过程左右洞相互影响进行模拟,并结合现场监控量测结果进行综合评价.研究结果表明：在不同的工况模拟下,隧道拱顶沉降、周边位移整体变化趋势基本一致;后行洞开挖使得先行洞拱顶沉降有所增长,但最终收敛值相差较小,且拱顶沉降相比周边位移要大;隧道左右洞施工相互影响最小的安全相邻掌子面纵向间距约为隧道开挖洞径的1.5倍.
Eight lanes in two-way tunnel excavation of large section, flat ratio lowly and structure stress complicated, it influenced each other obviously between tunnels. In addition, the existing engineering examples about technology research was still in the preliminary stage, no matter from the angle of design and construction, it had not formed a complete supporting technology. Based on the study of Quanzhou high rock tunnel of 2^# and 3^# mainline tunnel, the interaction between the left and right holes of the construction process was simulated by the finite element software, and combined with the results of the field monitoring by comprehensive evaluation. Research shows that, under different working conditions, the overall change trend of tunnel vault settlement and surrounding displacement is basically consistent; after the excavation of the tunnel, the vault settlement of the first hole is increased, but the final convergence value is less. And the crown settlement is larger than the surrounding displacement; determined reasonable hole construction constraints around the longitudinal spacing is about 1.5B.
作者
沈明燕
蔡子勇
李勇
王柏林
Shen Mingyan;Cai Ziyong;Li Yong;Wang Bailin(School of Mechanics and Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China)
出处
《湖南科技大学学报（自然科学版）》
CAS
北大核心
2018年第2期29-33,共5页
Journal of Hunan University of Science And Technology：Natural Science Edition
关键词
双向八车道
小净距
隧道施工
相互影响
仿真分析
The eight lanes in two-way tunnel
small spacing
tunnel construction interaction
interrelationship
simulation analysis
