多雨冲沟区在役桥梁桩基础工程安全保障技术研究

Research on Pile Foundation Safeguard Technique for Bridge-in-Service in Rainy Gully Area

为了研究多雨冲沟区在役桥梁桩基础工程的安全影响因素、安全评价方法及安全保障措施,对实际工程进行实地调研,应用层次分析法进行了分析。分析结果表明,影响多雨冲沟区在役桥梁桩基础工程安全的因素有自然因素和人为因素;适用于多雨冲沟区在役桥梁桩基础工程安全评价的10个指标为桩周岩土体特性、相对高差、坡度、植被覆盖率、日最大降雨量、地震烈度、桩基位置、桩周不良堆载、监控意识及防护措施;多雨冲沟区桥梁桩基周边环境危险度宜划分为3个等级:Ⅰ级、Ⅱ级、Ⅲ级,且不同危险度等级应采用不同的安全防护对策。

In order to study factors affecting the safety of the bridge pile foundation,the safety evaluation methods,safeguards in the rainy gully area and field investigation are carried on.At the same time,combining with the specialists opinion and AHP,the correlation analysis is conducted.The results show that the impact and rainy gully area of bridge pile foundation safety factors include natural factors and human factors.There are ten indicators suitable for safety evaluation for pile foundation of bridge in rainy gully area.They are geotechnical engineering characteristics around the pile,relative elevation,slope,vegetation coverage,largest rainfall of one day,earthquake intensity,pile location,adverse reactor load around pile,monitoring and protective measures.The risk of bridge pile foundation should be divided into three levels：LevelⅠ,LevelⅡ,and Level Ⅲ,and different risk levels should adopt different safety protection measures.