Abstract
The stability of underground water-sealed oil storage caverns is of great importance for safe excavation and operation. To analyze the scope of the failure zone and underground cavern stability accurately, a new method was developed that integrates the rock tunneling quality index Q-system and stability graph method with 3D laser scanning and numerical simulation. The point cloud data were obtained by 3D laser scanning, and the cavern model was built by using DIMINE software, which directly shows the 3D shape of the cavern. The rock mass physical and mechanical parameters and the corresponding stability coefficients were obtained based on Q-system and stability graph method. The plastic zone distribution and deformation characteristics of surrounding rock were analyzed through numerical simulation. Then, the corresponding relationship between caving zone and plastic zone was determined by comparing the numerical simulation results with the 3D laser scanning contour. The new method provides a reliable way to analyze the stability of the underground water-sealed oil storage cavern and also will helpful to design or optimize the subsequent support.
Highlights
Global energy shortages have prompted many countries to initiate or expand oil reserves
A new method, integrated empirical methods with 3D laser scanning and numerical simulation, was proposed and used in the underground water-sealed oil storage cavern in China. 3D laser scanning was used to monitor the cavern and obtain laser point clouds, combined the Q-system, and numerical simulation with the cavity model constructed by the data collected from 3D laser scanning, which shows the shape and depth of the damage and cavity of the underground water-sealed oil storage caverns
Using 3D laser scanning to analyze the stability of the cavern, after de-noising and simplifying the collected point cloud data, using relevant software to carry out 3D
Summary
Global energy shortages have prompted many countries to initiate or expand oil reserves. A new method, integrated empirical methods with 3D laser scanning and numerical simulation, was proposed and used in the underground water-sealed oil storage cavern in China. 3D laser scanning was used to monitor the cavern and obtain laser point clouds, combined the Q-system, and numerical simulation with the cavity model constructed by the data collected from 3D laser scanning, which shows the shape and depth of the damage and cavity of the underground water-sealed oil storage caverns. Rock mass quality zoning map of the underground water-sealed oil storage caverns. According to the actual engineering situation of the scanning zone, three parts of the scanning zone were selected to represent three different caving conditions, and the scanning data of these three sections were further processed. Zone C falls in the caving zone but is close to the boundary between the caving zone and transition zone
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