摘要
目的:地铁盾构隧道施工作业不规范或运营期荷载的变化,会产生管片错台与接缝张开,严重时导致隧道渗水漏沙,需快速准确地检测环内管片错台量与接缝张开量,因此提出一种基于点云的快速全面的检测方法。方法:介绍了提取中轴线的旋转投影法及具体计算步骤;研究了基于点云的地铁盾构隧道环内管片错台量与接缝张开量检测方法;结合北京地铁某工程,采用该方法进行了环内管片错台量及张开量检测。结果与结论:所提检测方法为:采用旋转投影法获取高精度中轴线,根据中轴线展开管片三维点云,分析管片拼接处附近点云空间关系实现环内错台及接缝张开量的检测。实例验证结果表明:该方法实用性强,能满足检测要求;与常用的双向投影法相比,旋转投影法中轴线拟合精度更高,最合适的旋转投影次数为3次。
Objective:Improper construction practices during metro shield tunneling or changes in operational load can cause segment staggering and joint opening,resulting in water seepage and sand leakage in the tunnel upon severity.It is necessary to detect the segment staggering and joint opening amounts within the tunnel ring rapidly and accurately.Therefore,a fast and comprehensive detection method based on point cloud is proposed.Method:The rotation projection method for extracting the central axis is introduced,and the specific calculation steps are outlined.The detection method for inner-ring segment staggering and joint opening of metro shield tunnel based on point cloud is described.The method is applied to a project in Beijing Subway to detect the inner-ring segment staggering and joint opening amounts.Result&Conclusion:The proposed detection method involves obtaining high-precision central axis using the rotation projection method,and unfolding the three-dimensional point cloud of inner-ring segments based on the central axis.The detection of inner-ring staggering and joint opening is achieved by analyzing the spatial relationship of point cloud near the segment joints.The results of the practical application demonstrate that the method has strong practicability and can fulfill detection requirements.Compared to the commonly used bidirectional projection method,the rotation projection method achieves higher accuracy in central axis fitting,with the most suitable number of rotation projection times being three.
作者
鲍艳
KIM IL BOM
李文海
张东亮
高利业
BAO Yan;KIM IL BOM;LI Wenhai;ZHANG Dongliang;GAO Liye(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,100124,Beijing,China)
出处
《城市轨道交通研究》
北大核心
2023年第9期143-149,共7页
Urban Mass Transit
基金
国家自然科学基金项目(51829801)。
关键词
地铁
盾构隧道
管片错台量
张开量
点云
中轴线
metro
shield tunnel
segment staggering amount
joint opening amount
point cloud
central axis
