Comprehensive exploration, safety evaluation and grouting of karst collapse columns in the Yangjian coalmine of the Shanxi province, China

Xu, Zhimin; Sun, Yajun; Gao, Shang; Chen, Hongying; Yao, Minghao; Li, Xin

doi:10.1007/s13146-021-00675-z

Cited by 11 publications

(5 citation statements)

References 46 publications

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“…Some scholars have also undertaken systematic and in-depth research on the safe mining of deep high-confined water coal seams from the aspects of floor grouting reinforcement and the slurry ratio [29][30][31] and provided theoretical guidance for floor reinforcement. Xu et al [32], based on the measured floor resistivity, studied the initiation, development, and water-filling dynamic evolution process of floor water inrush channels in the mining process, and, based on this, predicted the floor water inrush. Cao et al [33] analyzed the possible area of water inrush from the floor of the working face by using three-pole detection technology of the direct current method and adopted reasonable grouting parameters to reinforce the abnormal area by grouting.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Floor Damage and Slurry Material Ratio Optimization in Deep and High Confined Water Mining

et al. 2022

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Deep mining has started in the Huaibei mining area, and the serious threat of high confined water on the floor to the coal seam is gradually increasing. Based on the deep confined water mining project at working face II633 of the Hengyuan coal mine, this paper theoretically analyzes the damage depth of the floor and the risk of water inrush from the floor. The best proportion of grouting materials was quantitatively optimized by indoor experiments, and an industrial field test was conducted to judge the grouting effect. The results show that the failure depth of the bottom plate calculated by theoretical analysis is 31.73 m; a single factor test and a response surface optimization design method determined the best value of each index: water cement ratio 0.8, bentonite 2%, water reducer 0.6%, sodium silicate 2%. The damage depth of the bottom plate after grouting is 18.83~20 m, according to the field monitoring by the strain method. The optimized slurry significantly reduces the damage depth of the floor, ensures the safe and efficient mining of the coal seam above the high–pressure water, and has a high reference value for the safe mining of the coal seam under similar geological conditions.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Floor Damage and Slurry Material Ratio Optimization in Deep and High Confined Water Mining

et al. 2022

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“…According to the stress distribution of floor rock mass, the section along the inclined direction of rock strata can be selected as the research block [22,23]. According to the Saint Venant principle, the force system acting on a local area of the elastic surface can be replaced by the equivalent static force system.…”

Section: Theoretical Analysis Of Floor Failurementioning

confidence: 99%

“…The activation of KCCs in the water inrush process went through high-pressure water seepage, erosion, fracture germination, and expansion [20]. The treatment methods after water inrush mainly include physical exploration and drilling grouting [21,22].…”

Section: Introductionmentioning

confidence: 99%

Mechanism Analysis of Delayed Water Inrush from Karst Collapse Column during Roadway Excavation Based on Seepage Transition Theory: A Case Study in PanEr Coal Mine

et al. 2022

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Water inrush disaster is one of the major disasters affecting the production safety of coal mines following roof caving, fire, gas outburst, and dust explosion disasters. It is urgent to reveal the water inrush mechanism and take effective measures to prevent the disasters. More than 80% of water inrush accidents occur around geological structural zones such as faults and karst collapse columns (KCCs). The water inrush events from KCCs caused huge economic losses and heavy casualties, and the water inrush process often shows certain hysteresis characteristics. Taking the water inrush disaster from a KCC during roadway excavation in PanEr Coal Mine of Huainan Mining Area as the case study, the delayed inrush mechanism of KCC was analyzed from the aspects of floor failure, KCC activation, seepage transition, and water inrush development characteristics. The results show that the rock mechanical properties and the excavation depth are the main factors affecting the floor failure characteristics. The seepage transformation from pore flow to fracture flow and pipeline flow, with the change in internal composition structure, is the internal mechanism of the delayed water inrush from KCC. The research is of great significance for the prediction and prevention of water inrush disasters from KCCs.

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“…This structure can penetrate through the Ordovician tuff, mudstone, and coal layers [21]. When the pressurized water pressure within the Ordovician aquifer is greater than the principal stress of the key layer, the destruction of the column within the surrounding high permeability region will occur [22][23][24]. At this stage, many scholars mainly use series of sudden water models, and the lithological distribution perspective to precisely analyze the sudden water mechanism.…”

Section: Variable Mass Sudden Water Model With Fluid-solid Couplingmentioning

confidence: 99%

Experimental Study of Pore Permeability Characteristics Based On Variable-Mass System In Karst Collapse Pillars

Pang

Zhang

Liu

et al. 2022

Preprint

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Particle loss is the root cause for the occurrence of Karst Collapse Pillars (KCP) sudden water events. The pore adjustment of KCP filler will further induce seepage destabilization, and it is also a process that sudden water catastrophe must go through. In order to investigate the direct relationship between stress conditions, water pressure conditions, and gradation structure on the pore structure of rock samples, the steady-state percolation method was used to investigate the percolation test system of variable-mass crushed rock masses. The results show that: 1) the structural characteristics of rock grains under the same stress environment are closely related to their extrusion fragmentation process and the softening and scouring effect of water. Rubbing, rotating, fracturing, grinding and plugging are the main forms of action of their intergranular action. 2) The filling particles before and after the loss meet the fractal law and have fractal characteristics. 3) The percentage of fine particles in the whole process of infiltration loss is as high as 34.4%. The adjustment of pore structure is related to the particle size gradation, and the reciprocal action of water flow will form a stable water-conducting channel. 4) The sudden water process of the specimen under particle loss can be divided into three stages: initial seepage, catastrophic destabilization and pipe flow surge.

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Comprehensive exploration, safety evaluation and grouting of karst collapse columns in the Yangjian coalmine of the Shanxi province, China

Cited by 11 publications

References 46 publications

Experimental Study on Floor Damage and Slurry Material Ratio Optimization in Deep and High Confined Water Mining

Experimental Study on Floor Damage and Slurry Material Ratio Optimization in Deep and High Confined Water Mining

Mechanism Analysis of Delayed Water Inrush from Karst Collapse Column during Roadway Excavation Based on Seepage Transition Theory: A Case Study in PanEr Coal Mine

Experimental Study of Pore Permeability Characteristics Based On Variable-Mass System In Karst Collapse Pillars

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