Research on monitoring and stability evaluation of ground subsidence in gypsum mine goaf

Abstract

The geological disasters caused by the ground deformation of the goaf have brought huge security risks to the ecological environment and society. Therefore, it is imminent to realize the effective monitoring and stability analysis of the ground deformation of the goaf. In this paper, taking the goaf of the gypsum mine in Diaodao District, Jingmen City as an example, through the investigation of the overall structure and distribution characteristics of the gypsum goaf, combined with the mechanical parameters of the rock mass selected from the site, the InSAR and GNSS technology are used to analyze the ground of the goaf of the gypsum mine. Deformation monitoring is carried out to give full play to the advantages of InSAR monitoring with high vertical accuracy and GNSS monitoring with high horizontal accuracy. Analyzed the thickness conditions of the mined-out area of pillar, roof and overlying rock, established the numerical model of the goaf, and used FLAC (3D) to carry out numerical simulation on this basis to evaluate the stability of the goaf. The research shows that two subsidence areas and three deformation areas were deciphered by DInSAR and time series InSAR, respectively, and the deep buried areas in the goaf were monitored by GNSS. The surface deformation is dominated by horizontal displacement, and the direction of horizontal displacement is the whole points to the goaf. Finally, based on the conclusion that the gob is in different degrees of deformation, the stability of the gob is analyzed, and the area of surface subsidence is obtained by FLAC (3D) simulation.

Study on Stability Evaluation of Goaf Based on AHP and EWM—Taking the Northern New District of Liaoyuan City as an Example

“…In recent years, underground goaf collapse accidents have occurred frequently in China, resulting in serious economic losses, casualties, and ecological damage 16 . In particular, a large number of underground goaf caused by large-scale mining, China has more than 9,000 stateowned coal mines, with an annual output of 9 billion tons, underground goaf reserves of billions of cubic meters, the damage to China's vegetation, water resources and land, as well as the potential impact on the environment and public health, cannot be ignored.…”

Study on the Movement of Overlying Rock Strata and Surface Movement in Mine Goaf under Different Treatment Methods Based on PS-InSAR Technology

“…They concluded that underground mining aligns with the directional surface deformation and exerts a persistent and continuous impact on surface deformation. Xu et al [26][27][28][29][30][31][32][33] utilized D-InSAR, GNSS, and UAV technology to monitor surface subsidence in gypsum mines while they analyzed the stability of mined-out areas and evaluated the subsidence risk within mining regions. The study by Wang HN et al [15,[34][35][36] discovered that Persistent Scatterer Interferometric Synthetic Aperture Radar (PS-InSAR) and Small Baseline Subset Interferometric Synthetic Aperture Radar (SBAS-InSAR) technologies exhibit distinct advantages over D-InSAR technology in terms of long time-series analysis, atmospheric loss correlation, and monitoring accuracy.…”

Study on deformation characteristics of underground pipeline corridors and uneven settlement factors of foundations in sandy chalky soil layer

“…The joints of underground pipeline corridors are the weakest parts and are highly susceptible to the effects of uneven settlement (Liu et al, 2020;Jiang et al, 2020;Xie et al, 2020;Gebremedhn et al, 2019). Rigidly spliced box girder bridges under the influence of uneven settlement, the spliced section will appear the phenomenon of transverse stress peaks, which will lead to concrete cracking and damage (Xu et al, 2023). Settlement monitoring plays a crucial role in preventing geologic risks and disasters, and stochastic differential equations reliably yield shortterm settlement predictions (Guo et al, 2023).…”