Multi-point laser detection and geometric information acquisition of goaf

The space form and geometric information of the underground goaf is an important indicator to quantify and judge the positional relationship between the boundary of goaf and ore body. While the traditional engineering drilling measuring methods are often unable to accurately measure the actual goaf boundary. Three-dimensional laser scanning technology can remotely obtain the point cloud data of the goaf boundary. By using the point cloud coordinate conversion, stitching, and data redundancy processing, the Surpac mining software can build a three-dimensional model of goaf. The author focuses on the spatial position relationship between the goaf sectional boundary and ore body or backfill boundary in three main directions which are the blasting row line, perpendicular to the blasting row line and the horizontal direction. In order to facilitate the use of the spatial position information, the author converts the three-dimensional spatial information of goaf into two-dimensional spatial with the section plane forms. The study result shows important engineering significance for guiding the goaf filling and treatment in the future.