深基坑监测类型选择方法研究

Monitoring Items Selecting for Deep Foundation Excavation Construction

采用揭示风险贡献率量化的方法确定监测项目优先度分区标准,通过识别基坑过程中施工风险,构建地铁深基坑施工风险评价体系,确定基坑总体和部位的施工风险等级;建立了基于风险评价的深基坑施工监测项目选择方法,对监测项目优先度进行调整,确定实际工程监测项目优先度。结合某地铁深基坑监测实际案例,运用介绍的选择方法进行实证分析,并与规范和实际监测进行对比,验证了该方法的正确性与有效性。

In this paper,the concept of risk contribution rate for describing the nature of monitoring items is put forward. Based on the quantitative identification of engineering risk,building the risk rating standard system based on the basic engineering information can achieve and identify the risk level of overall and local risk position for deep foundation excavation of subway. Combined with the monitoring mechanism and the risk contribution rate,the priority system between risk position and monitoring items is established. And,a corresponding study on the actual case of a deep foundation excavation of subway monitoring is to verify the method for monitoring items selecting by comparing the result from the method,specification and the actual project.