TERRESTRIAL LASER SCANNING FOR DEFORMATION MONITORING OF THE THERMAL PIPELINE TRAVERSED SUBWAY TUNNEL ENGINEERING

摘要

As a kind of modern vehicle, more and more subway lines appear in order to meet the need of urban transportation. Abuilding Beijing subway line 10 is traversed by a thermal pipeline in China. To ensure the progress and safety of the subway tunnel, the deformation monitoring of the tunnel structure is necessary. The terrestrial laser scanning technology is applied to monitor the deformation of subway tunnel structure. The paper puts forward a method of three-dimension integral deformation monitoring of subway tunnel structure. This method can obtain the three-dimension integral deformation tendency, which help to provide mechanics analysis on the deformation of tunnel construction and provides the technical support for the design, construction and management. The monitoring project is introduced. Firstly, within the deformation district of subway tunnel, the annular closed survey control network is set along the line of the up-down rail. Secondly, put a set of cross section every 3m to 5m following the middle line of tunnel. Set the reflection sheets on the arch, vertical wall, rail subgrade, etc. Then collect the point clouds information by three-dimension lidar scanner. After data joint and registering, the three-dimension model of tunnel structure is established. Thirdly, adopt automatic electronic total station to monitor the deformation of tunnel structure by fixed stationing. Finally, according to data processing and analysis using a model interpolation method, the deformation of subway tunnel is fitted finally. Thus we can obtain the 3D image of the subway deformation in a precision, stereo and visual way.