基于离散元的砂卵石地层深基坑变形特性研究

Study on deformation characteristics of deep foundation pit in sandy cobble stratum based on discrete element method

考虑砂卵石各向异性的特点,采用数值模拟及现场实测分析了砂卵石地层深基坑的变形特性,得到结论:桩+内支撑是砂卵石地层基坑最常用的围护结构型式;随着基坑开挖,围护结构变形最大部位不断下移,受内支撑影响围护结构最大变形整体位于开挖裸露的围护结构中部;地表沉降最大值位于距离基坑边缘4~8m处,且最大值位置随着基坑开挖深度不断外移。

Considering the characteristics of sand gravel the deformation characteristics of deep foundation pit in sandy cobble stratum are analyzed by numerical simulation and field measurement.The following conclusions are obtained that pile+internal support is the most commonly used retaining structure of foundation pit in sandy cobble stratum.With the excavation of the foundation pit,the maximum deformation of the retaining structure moves downward,and the maximum deformation of the retaining structure is located in the middle of the exposed retaining structure.The maximum value of surface settlement is 4~8 m away from the edge of the foundation pit,and the position of the maximum value moves outward with the excavation depth of the foundation pit.