摘要
某4层建筑物地基土为软土,基础计算采用减沉复合疏桩法设计,紧贴建筑物北侧为小区道路,路基填土高度为2.3 m。填土引起建筑物南北沉降差约为90 mm,建筑物向北倾斜。现场实测与计算表明:采用传统的冲水排土法纠倾,在有桩情况下不能获得理想的纠倾效果,还会导致地基土的塑性流动,影响建筑物的稳定性。采用截桩迫降法实施纠倾后,北侧桩减载比例可达46%,北侧地基土压力也有明显的减少,同时南侧地基土压力显著增加,平抑了北侧填土引起的沉降。停止纠倾后,建筑物的沉降量约为20 mm。
A four-storey building in soft soil,which was designed by settlement control design theory,was adjacent to a path with 2. 3 m fill height of subgrade in the north of the building. The settlement difference between north and south was about 90 mm,the buildings tilted toward the north. The site measurement and calculation results showed that the traditional washed and drained soil rectification could not achieve desired rectification effect,and would cause plastic flow of the soil,thus affecting the stability of the building. Implemented rectification with cutting off pile top method,the unloading proprotion of piles on the north side got to about 46%,and the earth pressure was significantly reduced,while significant increase in subgrade earth pressure on the south side,which could reduce the settlement caused by filling in the north subgrade. The settlement of the building was about 20 mm.
出处
《工业建筑》
CSCD
北大核心
2015年第3期180-184,共5页
Industrial Construction
关键词
减沉复合疏桩基础
地基土塑性流动
截桩纠倾
沉降
不均匀沉降
composite foundation with settlement-reducing piles
plastic flow of the soil
rectification by cutting off pile
settlement
differential settlement
