土岩结合二元地层超深基坑支护优化设计

Optimal Design of Super Deep Foundation Pit Support in Soil and Rock Combined with Binary Stratum

依托武汉梦时代广场深基坑支护工程,结合监测资料,研究了在武汉地区软岩地层上深基坑的变形和支护结构的优化,并将原放坡支护、预应力锚索加钻孔灌注桩和局部支撑的支护方案优化为桩锚支护,通过FLAC3D数值模拟软件对典型剖面进行模拟计算分析,优化结果表明,优化后的桩体整体变形较为均勻,减小了发生折断破坏的可能性。为施工过程中的边坡稳定状态提供指导作用,对土岩结合的超深基坑支护设计提供参考。

Based on the deep foundation pit support project of Wuhan Dream Times Square,combined with the monitoring data,the deformation and optimization of the supporting structure of the deep foundation pit on the soft rock strata in Wuhan area are studied.The original slope support,pre-stressed anchor cable plus bored cast-in-place pile and local support are optimized as pile anchor support.The typical section is simulated and analyzed by FLAC3D numerical simulation software,and the optimization results show that the overall deformation of the optimized pile is more uniform,which reduces the possibility of fracture failure.The purpose of this paper is to provide guidance for the stable state of slope in the process of construction,and to ofFer reference for the design of ultra-deep foundation pit support combined with soil and rock.