Research On Safety Monitoring Of Foundation Pit Engineering Based On Unmanned Aerial Vehicle Image

China's construction industry is in a period of rapid development.Various construction companies are paying more and more attention to the development and utilization of urban underground space,and pit excavation is getting deeper and deeper.The situation of safe production of foundation pit projects is not optimistic,and pit excavation accidents occur frequently.It is necessary to carry out safety monitoring on the construction process of foundation pits.At present,the data acquisition method for safety monitoring of existing foundation pits is relatively simple,and the processing method for monitoring data is too simple,and it is impossible to visually and intuitively represent the deformation pattern of foundation pits.It is imminent to promote the construction of building construction safety information,comprehensively improve the construction safety production level,and improve the safety performance of building construction.In this paper,based on the actual foundation pit project,the method of safety monitoring of foundation pit based on UAV images is studied.Firstly,the paper sets up an index to monitor the safety of the foundation pit,that is to say,the minimum inclination angle of the foundation pit slope in the vertical direction is used as the benchmark for determining the safety status of the foundation pit.Utilize the drone to acquire the pit image quickly,use Pix4 D software to process the image,establish the foundation pit point cloud model,and acquire the point cloud data.In order to achieve fast and accurate operation of safety monitoring of foundation pits,MATLAB software is used to reduce the point cloud data based on the center of gravity algorithm.Finally,the simplified base pit cloud is rasterized to calculate a single small square inside point cloud.The inclination angle of the plane in the vertical direction is compared with the minimum inclination angle.According to the angle range,the safety status of the foundation pit point cloud is determined,so that the point cloud presents different colors,and dynamic visualization of the safety of the foundation pit excavation is realized.This paper establishes a method of monitoring the safety status of foundation pits based on UAV image processing technology and mathematical algorithms,which can help the monitoring personnel to more intuitively understand the safety status of foundation pit projects and make safety warnings in time.To a certain extent,the construction of safety information for the construction of foundation pits has been promoted,and the safety production level for the construction of foundation pits has been improved.In addition,this study provides a new perspective for the application of UAV images in engineering safety management,which is conducive to the promotion of UAV image processing technology in the engineering field.