基于现场监测的深基坑施工动态风险评估

目前常用的基坑风险评价方法主要是根据专家经验完全进行定性分析，存在很大的主观不确定性。以监测项目作为基坑风险的评价指标，并考虑监测项目之间的相对重要性关系，建立了基于现场监测的深基坑工程施工期风险评估指标体系。以监测报警值作为参考标准将监测数据量化为监测项目的安全风险概率;风险损失以监测项反映的可能风险源采用专家调查法进行估值;兼顾考虑基坑的安全风险概率和风险损失对基坑的风险度进行了分级，并根据风险度等级处理要求作出风险响应。通过工程实例对该风险评估方法进行了应用分析，表明该方法具有信息明确、动态、可靠的特点。

Dynamic Risk Assessment of Deep Foundation Pit Construction Based on Field Monitoring

Normal risk assessment methods are mainly based on the expert’s experience to make qualitative analysis whick are of great subject uncertainty. Moniroring items are used as the risk assessment indexes of foundation pit and the relative importance among the items are considered, a risk assessment index system based on field monitoring is developed. Risk probability of safety is quantized by monitoring data with treating monitoring alarm value as the reference standard and risk loss is estimated by expert investigation method. Aggregate risk degree is graded with considering risk probability as well as risk loss, and risk response measures are to be made based on the demands of the grading result. This method for the risk assessment is applied to an engineering case and the application result shows the method has the advantage of being clear, dynamic and reliable.