大尺寸地下排水干渠安全检测与鉴定

SAFETY INSPECTION AND APPRAISAL OF LARGE-SIZE UNDERGROUND DRAINAGEMAIN CANAL

目前,城镇地下大尺寸干渠结构由于未按规范设计或年久失修,已进入事故频发期。已有的城镇排水管道检测与评估技术规程主要针对渠道内结构性及功能性缺陷进行打分评级,但对结构实际强度检测与评估涉及较少。为全面评定大尺寸地下排水干渠安全性状况,以长沙市红旗渠项目试验段为背景,参考相关规范和标准,通过对该试验段土层状况、外观质量及结构强度现场检测,结合有限元分析验算,并综合分析现场检测状况及结构强度数据,对其进行安全性等级评定,为同类工程检测与鉴定提供参考。

At present,the large-scale underground main canal structure in cities and towns has entered a period of frequent accidents due to not being designed according to specifications or being in disrepair for a long time.The existing urban drainage pipeline inspection and evaluation technical regulations mainly focus on scoring and rating the structural and functional defects in the channel,but the actual strength inspection and evaluation of the structure is less involved.In order to comprehensively assess the safety status of large-scale underground drainage canals,this paper takes the test section of the Hongqi Canal project in Changsha City as the background,refers to relevant codes and standards and passes the field test of the soil condition,appearance quality and material strength of the test section,combined with finite element analyze and check calculations,and comprehensively analyze the on-site inspection conditions and material strength data,and evaluate the safety level,which provides a reference for the inspection and appraisal of similar projects.