| 单圆盾构隧道移动激光扫描收敛值计算 |
| |
| 引用本文： | 鲍金,王解先,黄帆,吴廷,李维涛,丁阳.单圆盾构隧道移动激光扫描收敛值计算[J].武汉大学学报(信息科学版),2021(3). |
| |
| 作者姓名： | 鲍金 王解先 黄帆 吴廷 李维涛 丁阳 |
| |
| 作者单位： | 同济大学测绘与地理信息学院;上海市建筑科学研究院 |
| |
| 基金项目： | 国家自然科学基金(41974025)。 |
| |
| 摘 要： | 近年来,架站式三维激光扫描技术广泛应用于盾构隧道收敛监测,但频繁换站降低了外业测量的效率。同时,在激光点云拟合计算收敛点坐标时,收敛点位置会随着隧道变形而变化,因而,点云曲线拟合难以确保得到不同时间、同断面、同收敛点坐标,影响了收敛值的精度。自主研发了一款经济适用且高效可靠的移动激光扫描监测系统,解决了架站式三维激光扫描监测效率低下的问题。针对收敛值计算方法存在的问题,详细讲解了基于隧道平铺图的收敛值计算方法,具体过程如下:首先,经过点云标准圆投影并展开,再经过图像栅格化、内插及增强处理得到隧道平铺图;其次,通过图像二值化、连通域分析、自动识别及人工纠正环缝,准确划分隧道每环点云;接下来,绘制每环管片接缝在平铺图的位置,求出每环收敛定点方位;最后,通过分管片拟合,计算收敛定点坐标并推出收敛值。计算实例表明,移动激光扫描收敛值重复结果差值均在1.5 mm以内,由此可知,提出的计算方法可用于单圆盾构隧道进行高效收敛监测,且精度可靠。
|
| 关 键 词： | 移动激光扫描 盾构隧道 收敛定点 隧道平铺图 |
Method of Calculating the Convergence Based on Mobile Laser Scanning in Circular Shield Tunnel |
| |
| BAO Jin,WANG Jiexian,HUANG Fan,WU Ting,LI Weitao,DING Yang.Method of Calculating the Convergence Based on Mobile Laser Scanning in Circular Shield Tunnel[J].Geomatics and Information Science of Wuhan University,2021(3). |
| |
| Authors: | BAO Jin WANG Jiexian HUANG Fan WU Ting LI Weitao DING Yang |
| |
| Institution: | (School of Surveying and Geographic Information,Tongji University,Shanghai 200092,China;Shanghai Academy of Building Sciences,Shanghai 200030,China) |
| |
| Abstract: | Objectives:In recent years,the convergence of shield tunnel using the terrestrial laser scanning is more and more widely,but stations changed frequently have an extreme influence on monitoring efficiency.The position of endpoints will change with the tunnel deformation when the laser point clouds is applied to fit curve in order to calculate the coordinates of endpoints.Therefore,it is difficult to ensure that the same convergent endpoints are obtained at different times using fitting curve based on point clouds which have an influence on the precision of convergence.Methods:Aiming at the problem of low efficiency of station-based 3D laser scanning,this paper introduces an economical,efficient and reliable mobile laser scanning monitoring method.For the calculation of convergence value,this paper introduces a new method based on tunnel expanded image in detail.Firstly,the expanded images of tunnel were obtained by the cylindrical projection of point clouds,the expansion of standard cylinder and gray rasterization,interpolation and gray enhancement of image.Secondly,it can accurately locate the section of point clouds of each ring in shield tunnel through the binaryzation of image,connected analysis,automatic identification and manual correction of ring cracks.Then,the positions between segments of each ring were manually drawn in the expanded image and the orientations of the fixed endpoints were deduced.Finally,the coordinates of the convergent endpoints were calculated and the convergences were calculated by fitting the segments.Results:The results show that the difference between the repetitive results of the convergence value using mobile laser scanning is less than 1.5 mm.Conclusions:The proposed calculation method can efficiently monitor the convergence of the single-circle shield tunnel with reliable accuracy. |
| |
| Keywords: | mobile laser scanning shield tunnel the fixed points of convergence the expanded image of tunnel |
| 本文献已被 CNKI 维普 等数据库收录！ |
|
