Dynamic monitoring of the mining-induced fractured zone in overburden strata, based on geo-electrical characteristics

Li, Juanjuan; Li, Fanjia; Hu, Mingshun; Zhou, Xuan; Huo, Yu

doi:10.1007/s12517-019-4591-x

Cited by 13 publications

(7 citation statements)

References 15 publications

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“…Du and Gao, Ren and Wang, and Wang et al [22][23][24] estimated the height and development law of the caving zone by analyzing the overburden caving characteristics of a completely automated acting surface using theoretical calculation methods, physical similarity experiments, numerical simulations, and field verification. Li et al [25] used the DC resistivity method to dynamically monitor the fracture zone, established the numerical model and physical model of mining overburden, and assessed the height at which the fracture zone was developing before using field verification to ascertain the WCFZ's elevation. To determine the WCFZ's elevation in the overburdened rock of a coal mine, Zhang et al, Chai et al, developed a mechanical analysis model and investigated the correlations between the height of the working face, the thickness of the safety coal pillar left behind, the filling rate and other factors, and the height of WCFZ.…”

Section: Introductionmentioning

confidence: 99%

Determination of the Height of Overburden Water-Conducting Fracture Zone in 215102 Working Face of Yue Nan Coal Mine

et al. 2022

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In order to extract gas accurately in Yue Nan coal mine and prevent gas over limit and gas accidents, a combination of theoretical analysis and numerical simulation was used to investigate the height of the overburden caving zone and fracture zone in the working face, using 215102 working face as the engineering background. The results show three key strata in the 215102 working face, namely siltstone, sandy mudstone, and sandy mudstone. The empirical formula’s calculation results are in good accord with the findings of the theoretical analysis, which indicates that the height of the water-conducting fracture zone created by mining in 215102’s working face is 87.35 m. The plastic zone, stress distribution and displacement variation of the model overburden of the working face were analyzed separately in the numerical simulation. The results of the plastic zone simulation show that the caving zone’s maximum height is about 15.96 m, and the fracture zone’s maximum height is approximately 82.39 m. The stress distribution shows that the caving zone’s greatest height is around 13.65 m, while the fracture zone’s maximum height is roughly 77.24 m. The amount of overburden subsidence proves that the caving zone’s maximum height of about 10.08 m, and the fracture zone’s maximum height of approximately 82.69 m. The height of the overburden caving zone and fracture zone of 215102 working face are ultimately found to be 14.02 m and 76.42 m, respectively, based on theoretical analysis, empirical formula calculation, and numerical simulation findings.

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Section: Introductionmentioning

confidence: 99%

Determination of the Height of Overburden Water-Conducting Fracture Zone in 215102 Working Face of Yue Nan Coal Mine

et al. 2022

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“…e slope stability of open-pit mine has extremely important influence on mining and surrounding environment [12][13][14][15][16][17][18]. e study on slope stability of open-pit mine mainly includes the stability of working side slope and dump slope [19,20].…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Deformation Law of Inner Waste Dump Slope in an Open‐Pit Coal Mine: A Case Study in Southeast Inner Mongolia of China

Cao

Wang

Song

et al. 2021

Advances in Civil Engineering

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The settlement and deformation of an open-pit mine waste dump were investigated by using field monitoring and numerical methods. The creep parameters of fine soil sand in the dump fill were inverted using the steady Burgers creep model, and FLAC3D software was used to simulate the dumping soil construction and development program. The results show that the settlement displacement of the dump increases with the time of dumping soil and tends to be stable after 4 years. In the creep attenuation stage of the creep process, there is a big difference between the numerical calculation and the field monitoring results in the inversion process of fine-grained soil sand parameters. In the steady-state creep stage, the numerical calculation is consistent with the field monitoring value. The height of the fill has an influence on the settlement of the fill body of the dump and the time to reach the stability. The higher the filling height is, the greater the postconstruction settlement will be, and the longer it will take to reach stability. The pushing position of the fill body has a great influence on the settlement displacement of the dump. The time and efficiency of soil discharge can be shortened by optimizing the safe distance between the filling body and the river. Based on the numerical calculation results and the empirical settlement function, an analytical method for river channel location selection of internal dump is proposed.

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“…At present, close-range photography, total station instruments, and dial indicators are usually used to obtain displacement measurements in similarity simulation tests, while strain gauges and pressure sensors are widely used for stress and strain monitoring. Due to the low test accuracy and disadvantages of scattered measurements only at selected locations, these testing methods are difficult to use for the continuous measurement of the entire field in real time [12,13].…”

Section: Introductionmentioning

confidence: 99%

Optical Fiber Frequency Shift Characterization of Overburden Deformation in Short-Distance Coal Seam Mining

et al. 2021

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Overburden deformation is an important concern for the safe and green mining of coal resources. Similarity simulation testing is the main approach used to study the deformation characteristics of the overburden in coal mining. In the application of Brillouin optical time-domain analysis (BOTDA) in similarity simulation tests, the capability of distributed optical fiber sensing (DOFS) to detect the characteristics of the overburden deformation and the evolution is a key factor affecting the testing accuracy. In this study, the relationships between DOFS and overburden deformation and the face impact pressure under geological conditions in short-distance coal seam mining were explored. The results show that DOFS can be used to monitor the strain conditions of the overburden during the entire mining process and can provide the peak positions of the advance support pressure on the face. A DOFS characterization model for investigating the spatial and temporal evolutions of overburden deformation was established. A new method of characterizing the face impact pressure based on the fiber frequency shift variation was developed. The method was demonstrated to be effective through comparison of monitored results of impact pressure counts detected using pressure sensors. The characteristics of the face impact pressure in short-distance coal seam mining were obtained. The results of this study provide valuable guidance for the development of similarity simulation testing and intelligent mining engineering techniques.

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Dynamic monitoring of the mining-induced fractured zone in overburden strata, based on geo-electrical characteristics

Cited by 13 publications

References 15 publications

Determination of the Height of Overburden Water-Conducting Fracture Zone in 215102 Working Face of Yue Nan Coal Mine

Determination of the Height of Overburden Water-Conducting Fracture Zone in 215102 Working Face of Yue Nan Coal Mine

Investigation on the Deformation Law of Inner Waste Dump Slope in an Open‐Pit Coal Mine: A Case Study in Southeast Inner Mongolia of China

Optical Fiber Frequency Shift Characterization of Overburden Deformation in Short-Distance Coal Seam Mining

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