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在基坑施工过程中,基坑围护结构设计的稳定安全系数是不可测的,因此,《建筑基坑支护技术规程》(JGJ120-99)和《建筑基坑工程监测技术规范》(GB50497-2009)要求不同安全等级基坑的施工过程中有不同类型的监测项目,并给予相应的安全预警值。由于施工监测项目数据的不同步性,为避免对施工过程安全状态的“突发性”以及应对不同安全状态措施的需要,提出了安全预警分级方法。根据监测项目的实测数据,采用模糊数学方法定义了广义稳定系数评估施工过程的安全状态,并给出了广义稳定系数的安全下限。基于实际工程的监测数据,分析了不同监测项目广义稳定系数的变化过程,指出了安全控制的重点监测内容。
During the construction of the foundation pit, the stability safety factor of the design of the retaining structure of the foundation pit is not measurable. Therefore, the Technical Code for Supporting the Foundation Pit (JGJ120-99) and the Technical Specification for the Monitoring of Foundation Pit Engineering Project (GB50497 -2009) require different levels of safety pit construction process there are different types of monitoring projects, and give the corresponding safety early warning value. Due to the unsynchronized data of construction monitoring project, in order to avoid the “suddenness” of the safety status of the construction process and the need of dealing with the different safety status measures, a safety precaution classification method is proposed. According to the measured data of the monitoring project, the generalized stability coefficient is defined by the fuzzy mathematics method to evaluate the safety status of the construction process, and the safety lower bound of the generalized stability coefficient is given. Based on the monitoring data of the actual project, the changing process of the generalized stability coefficient of different monitoring projects is analyzed, and the key monitoring contents of the safety control are pointed out.