（南京水利科学研究院 210029）
【提要】 某既有厂房内部大面积深开挖后，基坑边坡附近的柱基础因土压力作用发生明显的水平位移，柱身严重开裂。在柱基础水平位移测量、结构损伤调查检测和结构受力分析的基础上，认为厂房整体可靠性等级为最严重的四级。提出了柱身外包钢和柱基础增设树根桩的加固方案。
【关键词】 既有厂房 内部开挖 基础位移 结构损伤 可靠性评价
Assessment of Structural Damage Caused by Inner Deep Excavation in an Existed Workshop/Song Renxin，Chen Zhonghua，Fu Xiang，Wang Wuping(Nanjing Hydraulic Research Institute, Nanjing 210029，China)
Abstract:After inner deep excavation of large area in an existed workshop, the column base near the slope of foundation pit has an appreciable horizontal displacement due to soil pressure, which results in severe cleavage of the columns. After measuring the horizontal displacement of column base, investigating and inspecting structural damage, and analyzing mechanics of structure, the conclusion that the workshop overall assessment grade is the most serious Grade Ⅳ is presented. The reinforcement scheme including column enwrapping steel and adding root pile below column base is proposed.
Keywords:existed workshop; inner excavation; foundation displacement; structural damage; reliability assessment