基于三维激光扫描异地控制法的深基坑变形监测  

DEFORMATION MONITORING OF DEEP FOUNDATION PIT BASED ON ALLOCHTHONOUS CONTROL METHOD OF 3D LASER SCANNING

作　　者：熊春宝[1] 杨林[1] 熊爱成 叶作安 

机构地区：[1]天津大学建筑工程学院,天津300072 [2]天津市陆海测绘有限公司,天津300191

出　　处：《建筑技术》2016年第9期777-780,共4页Architecture Technology

基　　金：国家重点基础研究发展计划(973计划)课题(2010CB732106)

摘　　要：针对将三维激光扫描仪用于深基坑变形监测时难以在现场选设稳定控制点的实际情况,提出一种异地控制监测方法,该方法通过在远离基坑的稳定区域设置固定控制点,完成两期扫描点云的坐标配准;在基坑变形区域内的重点部位设置固定的标靶球作为监测点,将基坑整体面状监测与重点部位的特别点监测相结合,解决了基坑扫描点云中"伪变形"难以识别和同名点无法确定的问题。以天津市某深基坑为监测对象,采用FARO X330三维激光扫描仪进行变形监测,结果表明异地控制法完全可行,可在确保监测精度的前提下提高监测工作效率。A new method of allochthonous control for monitoring deformations of deep foundation pit by 3D laser scanning is proposed to solve the difficulty of setting stable control points at the construction site. The coordinate systems of the point clouds in different phases are unified by the stable control points away from the foundation pit. By setting fixed target balls as special monitored points in key region of the foundation pit, both the whole surface of the foundation pit and special points in key region can be monitored, and the difficulties of distinguishing the false deformations from the point cloud and determining correspondent points are solved. An experiment, that the deformations of a deep foundation pit in Tianjin are monitored by using Faro X330 3D laser scanner, is done. The results indicate that the new method of allochthonous control is feasible, and the efficiency of monitoring is promoted on the premise of high precision.

关 键 词：三维激光扫描 异地控制法 深基坑 变形监测 

分 类 号：TU454[建筑科学—岩土工程]