标题

综合地面激光扫描点云和设计模型评估隧道开挖质量

Evaluation of Tunnel Excavation Combing Terrestrial Laser Scanning Point Clouds and Design Models

作者

周雨舟，董震，童珮灵，杨必胜

来源

The International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences

摘要

隧道开挖质量是根据实际开挖模型和设计模型的对比来评估的。地面激光扫描为隧道三维重建提供了高密度、高精度的点云数据，然而隧洞点云存在点云空洞，给准确的三维重建和土方量算带来了挑战。这篇文章提出了一个综合地面激光扫描点云和设计模型的隧道开挖评估技术流程。本文的主要创新点在于，改进了隧道特征点的提取方式，并实现了顾及设计模型结构的特征点补全。

本文提出的技术流程如下图所示。

利用此方法可以准确提取隧道开挖横断面，并实现三维重建和土石方量算。

Abstract

The quality of tunnel excavation is evaluated by comparing the excavated tunnel and the design model. Terrestrial laser scanning (TLS) provides surveyors with dense and accurate three-dimensional (3D) point clouds for excavation model reconstruction. However, sufficient attention has not been paid to incorporating design models for tunnel point cloud processing. In this paper, a technical framework that combines TLS point clouds and the design model for tunnel excavation evaluation is proposed. Firstly, the point clouds are sliced into cross-sections and the feature points are accordingly extracted. Then, considering the structure of the design model, feature point deficiencies are repaired by topological and parametric model interpolation. Finally, the excavation quality is evaluated in terms of the deviation of centerlines and 3D models. This method is validated in the case study. Experiments show that the deviation of centerline azimuth is acceptable but there remain considerable overbreak and underbreak, which respectively account for 20.6% and 11.2% of the design excavation volume.