Surface Water Control for Mining Thick, Relatively Shallow Coal Seams in the Loess Area of Western China

Zhu, Ge; Wu, Xiong; Yu, Shuhui; Cheng, Qian; Dong, Yanyan; Zhang, Chaojun; Wu, Chu

doi:10.1007/s10230-018-0517-1

Cited by 10 publications

(3 citation statements)

References 23 publications

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“…At the same time, backfill materials such as coal stone, fly ash, ordinary Portland cement and ultra-high water materials can be used for backfilling, which effectively controls the formation and development of ground fissures (LEI et al, 2014;Zhu et al, 2018b). At the opening cut and the stop mining line, the permanent ground fissures can be repaired to prevent surface water from entering (Zhu et al, 2018a).…”

Section: Safety Analysismentioning

confidence: 99%

Study on the Dynamic Development of Ground Fissures in Shallow Coal Seam Mining Under Ditch

cheng

2021

Preprint

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In order to study the dynamic evolution law of ground fissures in shallow coal seam mining under ditch，taking the 14210 working face of a mine in northern Shaanxi as an example, this paper analyzes the dynamic development law of ground fissures in the process of mining under ditch through similar material simulation combined with the VIC-3D monitoring system. The results show that there are 20 ground fissures in the 14210 working face. The development width of ground fissures increases first, then decreases rapidly, and finally closes at the bottom of the ditch. The ground uplifts with a height of 1.5 m. The development width of ground fissures increases first, then decreases slightly, and finally tends to stabilize on the left and the right slopes, resulting in staggered steps with a height of 1.6 m and 0.7 m respectively. This change process is consistent with that of the strain of the underlying overburden obtained by VIC-3D strain analysis. According to their development positions and strain changes, the ground fissures are divided into three categories: tensile ground fissures on the left slope T1-T8, squeeze ground fissures at the bottom of the ditch T9-T13, and tensile ground fissures on the right slope T14-T20. Finally the safety analysis of mining under ditch in the 14210 working face is carried out.

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Section: Safety Analysismentioning

confidence: 99%

Study on the Dynamic Development of Ground Fissures in Shallow Coal Seam Mining Under Ditch

cheng

2021

Preprint

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“…Compared with the thick bedrock condition, the mining under the thintopsoil SCS formed a single key stratum structure in the main roof [22][23][24], which would withstand the overburden load up to the land face. Before the main roof fractured, the topsoil load was approximately the gravity of the H-thickness topsoil.…”

Section: Assessment Of Topsoil Characteristicsmentioning

confidence: 99%

Mechanical Modeling of Roof Fracture Instability Mechanism and Its Control in Top‐Coal Caving Mining under Thin Topsoil of Shallow Coal Seam

Gong

Zhao

Yetilmezsoy

et al. 2019

Advances in Civil Engineering

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This study aimed to explore the safe and efficient top-coal caving mining under thin topsoil of shallow coal seam (SCS) and realize the optimization of hydraulic support. Numerical simulation and theoretical analysis were used to reveal the stress distribution of the topsoil, the structure characteristics of the main roof blocks, and the development of the roof subsidence convergence. Step subsidence of the initial fractured main roof after sliding destabilization frequently existed, which seriously threatened the safety of the hydraulic supports. Hence, a mechanical model of the main roof blocks, where the topsoil thickness was less than the minimum height of the unloading arch, was established, and the mechanical criterion of the stability was achieved. The working resistance of the hydraulic support was calculated, and the reasonable type was optimized so as to avoid crushing accident. Findings of the present analysis indicated that the hydraulic support optimization was mainly affected by fractured main roof blocks during the first weighting. According to the block stability mechanical model based on Mohr–Coulomb criterion, the required working resistance and the supporting intensity were determined as 4899 kN and 0.58 MPa, respectively. The ZZF5200/19/32S low-position top-coal caving hydraulic support was selected for the studied mine and support-surrounding rock stability control of thin-topsoil SCS could be achieved without crushing accident.

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“…To date, many important results have been obtained through similar-material simulations (Lin et al 2010;Gao and Wu 2011;Zhao et al 2011;Sui et al 2015;Dong et al 2015;Zhang et al , 2017, numerical simulation experiments (Liu et al 2018a;Wu et al 2014;Liu et al 2018b;Meng et al 2018;Zhu et al 2018;Yin et al 2016;Wu et al 2015), theoretical analysis (Xu and Sun 2008;Shi et al 2012;Liu et al 2018b;Qiao et al 2017;Yin et al 2016), physical exploration (Yang et al 2018), and drilling tests (Luan et al 2010;Sui et al 2015;Dong et al 2015;Zhang and Peng 2005;Yin et al 2016) for the study of WFFZ height in the roof after coal mining. However, these methods mainly study height prediction of the WFFZ under specific geological and mining conditions, and it is difficult to conduct such studies under complex and variable geological and mining conditions (Wang 2006).…”

Section: Introductionmentioning

confidence: 99%

Height prediction of water-flowing fracture zone with a genetic-algorithm support-vector-machine method

Hou

Wen

et al. 2020

Int J Coal Sci Technol

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Prediction of the height of a water-flowing fracture zone (WFFZ) is the foundation for evaluating water bursting conditions on roof coal. By taking the Binchang mining area as the study area and conducting an in-depth study of the influence of coal seam thickness, burial depth, working face length, and roof category on the height of a WFFZ, we proposed that the proportion of hard rock in different roof ranges should be used to characterise the influence of roof category on WFFZ height. Based on data of WFFZ height and its influence index obtained from field observations, a prediction model is established for WFFZ height using a combination of a genetic algorithm and a support-vector machine. The reliability and superiority of the prediction model were verified by a comparative study and an engineering application. The results show that the main factors affecting WFFZ height in the study area are coal seam thickness, burial depth, working face length, and roof category. Compared with multiple-linear-regression and back-propagation neural-network approaches, the height-prediction model of the WFFZ based on a genetic-algorithm support-vector-machine method has higher training and prediction accuracy and is more suitable for WFFZ prediction in the mining area.

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Surface Water Control for Mining Thick, Relatively Shallow Coal Seams in the Loess Area of Western China

Cited by 10 publications

References 23 publications

Study on the Dynamic Development of Ground Fissures in Shallow Coal Seam Mining Under Ditch

Study on the Dynamic Development of Ground Fissures in Shallow Coal Seam Mining Under Ditch

Mechanical Modeling of Roof Fracture Instability Mechanism and Its Control in Top‐Coal Caving Mining under Thin Topsoil of Shallow Coal Seam

Height prediction of water-flowing fracture zone with a genetic-algorithm support-vector-machine method

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