基于冲击弹性波的混凝土冷缝检测及评价方法  

Detection and Evaluation Method of Concrete Cold Joint Based on Impact Elastic Wave

作　　者：吴佳晔 贾其松 陈霆 楼捍卫 邓愿涛 马永强 姜勇 WU Jiaye;JIA Qisong;CHEN Ting;LOU Hanwei;DENG Yuantao;MA Yongqiang;JIANG Yong(School of Mechanical Engineering,Southwest Petroleum University,Chengdu 610500,China;Sichuan Central Inspection Technology Inc.,Zigong Sichuan 643030,China;Diannan Railway Construction Headquarters,China Railway Kunming Group Co.Ltd.,Yuxi Yunnan 653100,China;Yunnan-Guangxi Railway Co.Ltd.,Nanning 530003,China;Engineering Quality Supervision Administration,CHINA RAILWAY,Beijing 100844,China)

机构地区：[1]西南石油大学机电工程学院,成都610500 [2]四川升拓检测技术股份有限公司,四川自贡643030 [3]中国铁路昆明局集团有限公司滇南铁路建设指挥部,云南玉溪653100 [4]云桂铁路广西有限责任公司,南宁530003 [5]中国国家铁路集团有限公司工程质量监督管理局,北京100844

出　　处：《铁道建筑》2023年第1期88-91,共4页Railway Engineering

摘　　要：根据冷缝对混凝土结构性能的影响和冲击弹性波中R波的特点,提出基于冲击弹性波的冷缝检测方法。采用综合考虑了等效抗剪率及等效强度率的健全性指标评价疑似冷缝对混凝土结构的影响,进而判定是否为冷缝。经对十多条隧道416处疑似冷缝检测,冷缝处、非冷缝处的健全性指标平均值分别在0.50、0.88左右,健全性指标对冷缝有较好的辨识度。对于拱顶及其附近的疑似冷缝,由于其所在面与测试面呈小角度相交,测得的健全性指标有偏大趋势,存在误判可能,因此须要采用冲击回波声频法或敲击法辅助检测。According to the influence of cold joint on the performance of concrete structure and the characteristics of R wave in impact elastic wave,a cold joint detection method based on impact elastic wave is proposed.The influence of the suspected cold joint on the concrete structure is evaluated by the soundness index that comprehensively considers the equivalent shear rate and the equivalent strength rate,and then whether it is a cold joint is determined.Through the detection of 416 suspected cold joints in more than ten tunnels,the average value of the soundness index at the cold joint and the non-cold joint is about 0.50 and 0.88 respectively,and the soundness index has a good identification of the cold joint.As for the suspected cold joint near the vault and its surrounding area,the measured soundness index tends to be large due to the small angle intersection between its surface and the test surface,and there is the possibility of misjudgment.Therefore,it is necessary to use the impact acoustic echo method or the knocking method to assist the detection.

关 键 词：铁路隧道 冲击弹性波法 现场试验 施工冷缝 隧道衬砌 敲击法 冲击回波声频法 

分 类 号：U456[建筑科学—桥梁与隧道工程]