摘要
文章结合昆明地铁工程实例,采用数值模拟法研究了隧道底部为泥炭质地层条件下盾构掘进过程对地表及建筑的沉降影响。研究结果表明：泥炭质地层在施工荷载作用下发生超前压缩和沉陷,地表纵向隆起影响范围约为2-3倍的隧道直径,横向沉降影响范围约为7倍的隧道直径且最大沉降值发生在先施工隧道上;掘进面后方30m以外地表沉降趋于稳定;地表及建筑沉降主要由先施工隧道引起,主要发生在先施工隧道轴线两侧20 m范围内,导致建筑以倾斜和下部结构拉伸破坏为主;为此应根据地表变形规律、建筑与先施工隧道的相对位置关系,采取相应的措施减少建筑破坏。现场实测数据验证了地表及建筑的沉降规律。
In this paper, using the Kunming Metro as an example, the effects of shield tunnelling in a peat soil stratum on ground and building settlement are studied using a numerical simulation method. The results show that： 1） advanced compression and settlement of the peat soil are induced by the construction load; 2） the influence range of ground heaving in the longitudinal direction is nearly 2-3 times the tunnel diameter, while the influence range of settlement in the horizontal direction is nearly 7 times the tunnel diameter, with maximum settlement occurring in previously constructed tunnels; 3） the ground settlement becomes stable 30 m behind the excavation face; and 4） ground and building settlement is mainly induced by previously constructed tunnels,within a range of 20 m on both sides of the tunnel axis, which leads to the building inclination and tensile failure of the substructure. Therefore, countermeasures should be adopted to reduce such building damage according to ground deformation laws and the relative position of buildings and previously constructed tunnels. The ground and building settlement laws are verified by field test data.
出处
《现代隧道技术》
EI
CSCD
北大核心
2015年第3期160-167,共8页
Modern Tunnelling Technology
基金
国家自然科学基金(51078319)
关键词
泥炭质地层
盾构隧道
数值分析
沉降
监测
Peat soil stratum
Shield tunnel
Numerical analysis
Settlement
Monitoring
