曲线顶管施工引起的地表变形预测研究

发布时间：2018-06-26 21:55

本文选题：曲线顶管 + 地表变形　；参考：《隧道建设》2017年09期

【摘要】：为了研究曲线顶管施工引起的地表变形,通过分析拱北隧道管幕工程曲线顶管现场实测数据,得出曲线顶管地表沉降槽的偏移曲线;在现有Peck和Loganathan地表变形计算公式的基础上,考虑曲线顶管与隧洞的相对位置对沉降槽偏移量的影响,得出经过沉降槽偏移修正的Peck和Loganathan地表变形预测公式。结果表明:1)曲线顶管施工引起的地表沉降槽曲线表现为非对称,最大沉降点可能出现在轨迹弯曲内侧,也可能偏向外侧;2)曲线顶管与隧洞相对位置引起的土体损失变化是造成沉降槽偏移的主要原因,相对位置与顶管穿越地层性质、顶进力、注浆压力和轨迹曲率半径等因素有关;3)修正的Peck公式可以较好地反映砂层和淤泥质土层中曲线顶管施工地面沉降槽偏移效应和最大沉降量。
[Abstract]:In order to study the surface deformation caused by curved pipe jacking, the migration curve of surface subsidence trough of curved pipe jacking is obtained by analyzing the measured data of curve jacking in Gongbei Tunnel, and based on the existing formulas for calculating surface deformation of Peck and Loganathan, Considering the influence of the relative position of the curved pipe jacking and the tunnel on the settlement channel migration, the prediction formulas of Peck and Loganathan surface deformation modified by the settlement trough migration are obtained. The results show that the curve of surface subsidence trough caused by the construction of curved pipe jacking is asymmetric, and the maximum settlement point may appear in the inner side of the trajectory bend. The change of soil loss caused by the relative position of the curve pipe jacking and the tunnel is the main cause of the deflection of the settlement trough, and the relative position and the jacking pipe pass through the stratum property, the jacking force, the relative position and the jacking pipe are the main causes of the displacement of the settlement trough. The modified Peck formula can well reflect the migration effect and maximum settlement amount of the ground subsidence trough in the curved pipe jacking construction in sand and silt soil.
【作者单位】：中国地质大学(武汉)工程学院;广东省南粤交通投资建设有限公司;
【基金】：交通运输部项目(201331J11300)
【分类号】：U456.3

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