狭长深基坑水平拉槽高效开挖技术

High Efficiency Excavation Technology for Horizontal and Deep Excavation of Long and Narrow Foundation

针对地铁车站狭长深基坑采用台阶法开挖效率低、成本高、对周边环境影响大等问题。通过FLAC3D有限差分分析方法,分析狭长深基坑土方开挖过程中的围护结构受力变形特点,提出地铁车站狭长空间土方高效开挖方法。通过采用被动区对称留土的方式控制围护结构变形,通过降低土方分层开挖高度大幅减少土方倒运次数,在提高土方开挖效率的同时有效控制围护结构受力变形。

Aiming at the problems of low excavation efficiency,high cost and great influence on surrounding environment of long and narrow foundation pit of metro station by step method.Through FLAC3D finite difference analysis method,the stress and deformation characteristics of enclosure structure during excavation of long and narrow foundation excavation are analyzed,and an efficient excavation method for long and narrow space of subway station is proposed.By using symmetrical retaining soil in passive zone to control the deformation of enclosure structure,and by reducing the excavation height of layered earthwork,the number of earthwork inversion is greatly reduced,which can improve the efficiency of earthwork excavation and effectively control the stress and deformation of enclosure structure.