摘要
圣彼得堡斯托克曼商业中心采用逆作法施工。基坑围护结构采用三面钢板桩、一面地下连续墙,深24m。在基坑施工过程中,对钢板桩倾斜、周边建筑沉降及地下水位变化进行监测。监测结果证明:钢板桩倾斜程度随土方开挖逐步增加,且与挖土时间和楼板实施时间成正比,钢板桩处监测点水平位移约为地下连续墙处的2倍;在基础拆除和钢板桩实施阶段采取分段实施、提高设备频率、基础桩间隔跳打等措施,将周边建筑沉降控制在允许范围内;随基坑开挖,地下水位持续下降,但总体趋势趋于平缓,基本符合设计下降曲线。
Top-down construction method is adopted in Stockmann Nevsky Center in St. Petersburg,and 24m depth steel sheet piles at three sides and diaphragm wall at the other side of foundation excavation are selected as supporting structure. In foundation excavation construction, inclination of steel sheet piles, settlement of surrounding buildings and underground water level are monitored. Monitoring results show that inclination of steel sheet piles increases with excavation depth, and it is proportional to excavation time and slab construetion time. Furthermore, horizontal displacement of steel sheet pile is two times of diaphragm wall. Settlement of surrounding buildings is controlled in allowable range by demolishing foundation and constructing steel sheet piles in multi-section, improving equipments frequency and driving piles alternately. Underground water level descendes gently and continuously with excavating of foundation excavation, and it can meet design curves.
出处
《施工技术》
CAS
北大核心
2010年第1期28-32,共5页
Construction Technology
关键词
基坑
逆作法
监测
沉降
测斜
地下水位
foundation excavation
top-down construction method
monitoring
settlement
inclination monitoring
underground water level
