南宁软岩地层地铁车站深基坑变形规律分析

Analysis on the Deformation Laws of Deep Foundation Excavation of Subway Station in Soft Rock Area in Nanning

针对南宁地区特殊的地质地貌特征以及多级放坡-深基坑开挖联合支护体系的地铁车站建设,开展各级边坡及围护结构的变形规律分析研究。结果表明,桩顶有无支撑对其稳定性影响较大,不宜采用悬臂桩围护结构形式,且各级边坡因受深基坑开挖、自身支护结构、自重应力及岩体膨胀特性等方面的影响,坡顶及坡面发生不同程度水平变形和竖向隆起。

The authors made research and analysis on deformation law of each step slope and building envelope according to the special characteristics of geology land form of Nanning area and subway station construction of combined supporting system for deep foundation excavation by steps slope method. The results showed that the top of the pile with bracing structure or not has quite an influence on the stability of the pile, so the enclosure structure of cantilever pile should not be adopted. The top and the surface of every step slope which is affected by deep foundation excavation, its own support structure, gravity stress and the expansion characteristics of rock, etc, may produce deformation along the level direction and the perpendicularity one to a greater or lesser degree.