深圳盐田行政大楼厚填石层大型基坑支护设计

Design of Large Foundation Pit Support in Backfilled Stone Layer of an Office Building in Shenzhen

摘要:

盐田国际行政办公大楼场地浅层由填石填海而成，填石层厚度约10 m，填石粒径20～80 cm。为了满足地下室结构和桩基础施工需要，一般基坑开挖深度≮8.7 m，局部达到14.4 m，基坑开挖支护难度极大。因此，选择合适的基坑支护方案就显得尤为重要。深圳盐田行政大楼基坑工程从众多支护方案中选择了“放坡开挖加封水帷幕方案”，从设计计算上确保基坑及周边建筑物安全。后期实施效果证明了方案经济合理、安全可靠。

Abstract:

The shallow layer of an office building site was reclaimed by backfilling, the thickness of filling layer was about 10m with particle size of 20~80cm. To meet the requirements of basement structure and pile foundation construction, generally the excavating depth was not less than 8.7m and the local depth reached 14.4m. It is particularly important to select proper foundation pit support plan for the very difficult support in this project. Step-slope excavating and water-sealing curtain scheme was chosen, the safety of the foundation pit and the surrounding buildings were ensured in the design calculation. The results show that this selected scheme is reasonable, safe and reliable.