Study on the Evolution Law of Overlying Strata Structure in Stope Based on “Space–Air–Ground” Integrated Monitoring Network and Discrete Element

Abstract

The geological environmental damage caused by coal mining has become a hot issue in current research. Especially in the western mining area, the size of the mining working face is large, the mining intensity is high, while the surface movement and deformation are more intense and wider. Therefore, it is necessary to effectively monitor the surface using appropriate means and carrying out research on the overlying strata structure of the stope. In this paper, by using advantages of various subsidence monitoring technologies and the technical framework of the Internet of Things (IoT), a “space–air–ground” integrated collaborative monitoring network is constructed. The evolution law of overlying strata structure is studied based on discrete element simulations and theoretical analysis. Furthermore, a discrete element mechanical parameter inversion method is proposed. The main results, using numerical simulations, are as follows: The mean square error of monitoring surface subsidence is 33.2 mm, the mean square error of mechanical parameter inversion is 13.4 mm, and relative error is as low as 3.8%. The surface subsidence law of adjacent mining under different working face widths and interval coal pillar widths is revealed. The Boltzmann function model of surface subsidence ratio changing with width–depth ratio and the calculation formula of width reduction coefficient of adjacent mining working face are inverted. The critical failure width of the interval coal pillar is determined as 20.5 m. Based on the theory of “arch–beam” structure and numerical simulation results, the overlying strata structure model of adjacent mining in the mining area is constructed. The research results can provide technical support or theoretical reference for mining damage monitoring, subsidence control, and prediction in western mines.

LOS Deformation Correction Method for DInSAR in Mining Areas by Fusing Ground Data without Control Points

“…To recover the lost LOS deformation, Jiang et al [40] converted the theoretical deformation obtained by the "LOS deformation of DInSAR + subsidence prediction model" into a wrapped DP, and they removed it from the interferometric phase and unwrapped it again. Jiang et al [26] adopted the same approach to extract large-gradient three-dimensional displacements in mining areas. However, they only used single-source space data.…”

“…Recently, Yan et al [24] proposed a "space-sky-ground" integrated collaborative monitoring framework in mining areas, and Jiang et al [25] discussed the possibility of integrating other source measurement data with space data. These scholars have attempted to fuse other source measurement data in order to obtain high-precision deformation information, providing innovative research directions for deformation monitoring in mining areas [24][25][26].…”

Mapping mining-induced ground fissures and their evolution using UAV photogrammetry

“…Traditionally, researchers searched for ground fissures by vehicle or on foot, measuring and recording them with instruments such as tape measures, total stations, and cameras, followed by subsequent data analysis (Bian et al, 2014;Xu et al, 2021). While manual inspection methods provide high accuracy, they are time-consuming and laborintensive, and researchers' safety cannot be guaranteed (given the large number of ground fissures, many of which are located in dangerous areas) (Peng et al, 2018;Zhu et al, 2023). Some scholars have extracted ground fissure features using satellite remote sensing images.…”

A Study on the Movement and Deformation Law of Overlying Strata and the Self-Healing Characteristics of Ground Fissures in Non-Pillar Mining in the Aeolian Sand Area

“…Coal mining in the northern Shaanxi region is characterized by strong surface movement and deformation as well as short and intense overlying strata activity. Furthermore, the surface can be subjected to a large number of ground fissures, leading to soil nutrient loss, surface runoff depletion, vegetation withering, and death, as well as endangering the ecological environment [16][17][18]. This ground fissure disaster is a global issue.…”