【摘要】 给出了北京奥林匹克公园地铁车站深基坑支护结构变形监测方案设计,制定了监测项目、监测仪器和监测频率,完成了现场监测工作,根据监测结果分析了围护桩水平位移及锚杆受力变化规律。结果表明,围护结构设计及监测方案是合理的。围护桩的水平位移随着基坑开挖深度的增加而增大。围护桩和预应力锚杆联合支护形式能够有效地控制基坑变形,保证地铁车站安全施工。监测到的围护结构变形和内力较小,说明围护结构设计偏于保守。更多还原

【Abstract】 The deformation monitoring plan of supporting structure for the deep foundation pit of Beijing Olympic Park subway station was given.The monitoring item,apparatus and frequency were formulated.The in-situ monitoring jobs were completed. According to the monitoring results,the deformation characteristics of horizontal deformation of supporting pile bodies and variation laws of axial force of bolting bars were analyzed.The study shows that the design of supporting structure and the monitoring plan are reasonable.The horizontal deformation of the retaining piles increase with the increment of excavation depth.The multiplex supporting plan consists of retaining piles and pre-stressed anchor can control the deformation efficiently and assure a safe construction of subway station.The values of the deformation and the internal force of retaining piles is smaller,so the support scheme is conservative.更多还原