灰色关联度法在排桩基坑安全评价中的应用

应用灰色关联度分析法,进行广州五山街道社区服务中心大楼排桩基坑安全性综合评价。将此基坑分为多个评价单元,结合影响基坑稳定与安全内因和外因,选取支撑类型、围护结构刚度、基坑旁载(不对称荷载)、放坡平台宽度、开挖与架立内撑时间间隔、超挖、锚索(锚杆)施工质量等7个具有代表性的影响因子作为评价因素,据唐业清教授统计多起基坑事故影响因素综合评价分值和现场监测信息为评价参考指标,应用灰色关联度分析法将此基坑划分3个安全等级,定量分析其安全性,为类似基坑安全分析与预防提供参考。

Application of GRA in a Deep Excavation Supported by Anchored Tangent Pile Walls

The stability of the deep excavation for the community service center of Guangzhou Wushan Avenue is comprehen-sively evaluated by using （;ray Relation Analysis （GRA） method. The deep excavation is supported by anchored tangent pilewalls. The entire excavation supporting system is divided into several sub units so that the representative factors that might impact the stability of the excavation can be evaluated. These seven （7） factors are internal supporting type, stiffness of the supporting system, surcharge near the excavation （asymmetric loading condition）, width of the berm in front of the excavation,time lapse between the excavation and internal bracing, amount over excavation, anchor installation quality. The comprehensiveevaluation value numbers recommended from the back analysis of the case history of the deep excavation failures as well as theinsitu monitoring data are used as the reference of the evaluation. This deep excavation site can be quantitatively classified intothree safety categories based on the GRA approach. The GRA approach provides a useful tool for the prediction of the excavation.