张洪明¹，杨  静²，冯道德¹
     (1 空军第一工程总队，北京100089;  2北京建筑工程学院，北京100044)

[摘要] 某写字楼工程基坑开挖深度14m，基坑东侧12m是一栋16层的住宅楼，基坑南侧2.5m是马路人行道，基坑西侧18m是一栋10层的写字楼。基坑开挖深、周边情况复杂，邻近有建筑物和道路。通过技术经济分析，基坑施工采用锚拉桩支护，以及止水帷幕与管井相结合降截水的施工方案，实践证明，取得了较好的工程效果。
[关键词] 深基坑；支护；降截水；技术

Construction technology of supporting and dewatering of deep foundation pit in an office building project
Zhang Hongming¹, Yang Jing², Feng Daode¹
(1  The First Brigade of Construction and Installation of the Chinese Air Force, Beijing  100089, China;  2 Beijing Institute of Civil Engineering and Architecture, Beijing 100044, China)

Abstract: Afoundation pit excavation of an office building project is 14m in depth. Around the foundation pit, 12m away in the east is a 16-story residential building, 2.5m away in the south is a street sidewalk, and 18m away in the west is a 10-story office building. According to the deep excavation, complicated circumjacent situation, and the neighborhood of buildings and streets, through the technical and economic analysis, the construction of the deep foundation adopt the anchor piles supporting scheme, as well as the scheme ofwater stop curtain combined with tube-well for dewatering and water cutting off. The method proved effective in practice and achieved good project results.
Keywords: deep foundation pit; supporting; dewatering and water cutting off; technology