桩+喷锚支护在某新建站房土岩结合深基坑中的应用

在分析土岩结合深基坑特点的基础上,针对周边环境复杂、下部岩体为中硬质岩或硬质岩的土岩深基坑,建议采用上部桩(撑或锚)+下部喷锚支护的支护方法,并提出采用三阶段计算法进行设计计算。针对某新建站房土岩结合深基坑,采用三阶段计算法进行桩+喷锚支护设计,并对其进行数值模拟分析,结果表明:桩+喷锚支护能够较好地控制基坑变形,能够保证基坑的整体稳定,从而验证了桩+喷锚支护适用于土岩结合深基坑支护,按三阶段法进行设计计算是安全可靠的。

The Application of Pile and Shotcrete Anchor Supporting in a New Station Building Deep Foundation Pit in Rock and Soil

Based on the analysis of the characteristics of deep foundation pit in rock and soil,the pile and shotcrete anchor supporting is recommended for those deep foundation pits in rock and soil in complex surrounding environment with medium hard or hard lower part rock. And three-stage calculation is conducted for design calculation. For a new station deep foundation pit in soil and rock,three-stage calculation method is used for pile and shotcrete anchor support design,and numerical simulation is usedfor analysis. The results show that the pile and shotcrete anchor supporting can effectively control the pit deformation and ensure overall stability of the deep foundation pit. So it is verified that theshotcrete anchor support is suitable for deep foundation pit in rock and soil and the three-stage calculation method is safe and reliable.