【摘要】 建筑基坑支护技术规程(JGJ 120-99)和建筑基坑工程监测技术规范(GB 50497-2009)对基坑工程设计规定了相关的安全系数和施工过程中监测项目的安全预警值。但是在监测安全预警值应用中存在一些不足,例如不能进行预警的过程控制,各项监测项目数据达到安全预警值不具有同步性,进而使得监测预警缺乏整体控制。为避免对施工过程安全状态认识的"突发性"以及应对不同安全状态措施的需要,提出了安全状态分级方法。根据某一基坑工程的监测数据及其反演计算的预测,及时确定施工进程中的基坑安全状态。该方法的最大优点在于有利于施工安全的过程控制。更多还原

【Abstract】 The some safety factors related to foundation pit engineering are given in Technical specification for retaining and protection of building foundation excavations(JGJ120-99) and the safety alarming value for monitoring the foundation pit during work progress is stipulated by Technical Code for Monitoring of Building Foundation Pit Engineering(GB50497-2009).However,there is some faultiness,for example,there is not process control of warning and data each monitoring is non-synchronous to reach the safety alarming value.The monitoring alarm is then incomplete in the integral control of pit.The classing method of safe state is suggested to avoid the burstiness the cognition to the safe state of working progress and demand for coping behavior of different safe states.As a real example,the safe state of pit in the progress of excavation is defined based on the analysis of the monitoring data and predetermination of applying inversion calculation.The advantage of this method is expedient for the process control of construction safety.更多还原