Study on the Migration Law of Overlying Strata on the Working Surface of Large Mining Height in Y.C.W Coal Mine

Liu, Hongtao; Huo, Tianhong; Liu, Yang; Han, Zhou; Han, Zijun; Liang, Wanliang

doi:10.1155/2022/6292783

Cited by 4 publications

(3 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Compared with the general mining height working face, the mining thickness of extrathick coal seam is large, and the migration range of intrusive rock is wide after mining, which leads to more obvious intrusive rock movement. At the same time, disasters such as strong mine pressure, gas outburst, and rock burst occur [15][16][17][18][19]. According to the national statistical data of coal mine accidents from 2010 to 2019, there were 2536 roof accidents, accounting for 44.41% of the total number of coal mine accidents, and 3208 deaths, accounting for 32.28% of the total number of deaths, ranking first in all types of accidents [20].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Overlying Strata Movement Characteristics and Distributed Optical Fiber Characterization of Stope

et al. 2022

View full text Add to dashboard Cite

In order to study the migration characteristics and strata behavior law of mining-induced rocks in fully mechanized caving face of coal mine, taking the actual geological mining of Longwanggou Coal Mine as the background, using computer software (KSPB) to identify the location of key strata. The physical similar material simulation test was used to monitor the movement characteristics of mining-induced rocks by using the internal displacement sensor (IDS) and distributed optical fiber sensor (DOFS). A three-dimensional physical model of 3.6 m × 2.0 m × 2.0 m was built; the internal displacement of rock was measured by IDS. BOTDA distributed optical fiber was used to monitor the dynamic movement and deformation law of coated rock. Finally, the two monitoring results were compared and analyzed. The results show that: (1) the displacement curve of the fractured rock mass in the key strata shows a “stepped” increase; (2) based on the analysis of displacement continuous monitoring results, the strata behavior law of working face is obtained. The first weighting interval of 61601 working face is 90 cm, and the periodic weighting steps are 105 cm, 115 cm, 135 cm, 150 cm, 165 cm, 180 cm, 215 cm, and 240 cm; (3) the average strain of fiber is proposed. The first weighting and periodic weighting laws of the working face are represented by the average strain, which are consistent with the experimental phenomena. The first weighting in the average strain curve shows the first mutation peak, and the periodic weighting shows the periodic mutation peak change of the average strain curve.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental Study on Overlying Strata Movement Characteristics and Distributed Optical Fiber Characterization of Stope

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The high key stratum is the main key stratum between the extra‐thick coal seam and the nearest goaf, and it is the main control stratum for the development of overburden water‐conducting fracture. Once it is fractured, the water‐conducting fracture will be connected with the upper goaf, and the water and harmful gas in the upper goaf may inrush to the carboniferous extra‐thick coal seam working face, causing equipment damage and casualties 7 …”

Section: Introductionmentioning

confidence: 99%

“…Once it is fractured, the water-conducting fracture will be connected with the upper goaf, and the water and harmful gas in the upper goaf may inrush to the carboniferous extra-thick coal seam working face, causing equipment damage and casualties. 7 Researchers studied the development law of waterconducting fracture zone in extra-thick coal seam mining and the effect of key stratum fractures on waterconducting fracture development by various methods. 8 Liu et al 9 tested the height of water-conducting fracture development in full-mechanized top-caving mining of extra-thick coal seams using borehole peephole and simple hydrological measurement methods.…”

Section: Introductionmentioning

confidence: 99%

Study on fracture characteristics of high key stratum and development law of water and gas transport channels in Datong mining area

Wang

et al. 2022

Energy Science & Engineering

View full text Add to dashboard Cite

The study aimed to examine the problem of the abandoned mine water and harmful gas downflow from the overlying Jurassic of Tongxin coal mine in the Datong mine area, China. A theoretical analysis, physically similar simulation, and field measurement were used. A fracture aperture mechanical model based on key stratum fracture was used to analyze the main influencing factors of high key stratum fracture and rotation. We also compared the fracture characteristics, displacement changes, and fracture development of the high-key stratum. The results showed that: (1) the main influencing factors affecting the fracture characteristics of high key stratum are the thickness of coal seam mining, the thickness of high key stratum, and the distance between high key stratum and 3-5# coal seam. (2) When both 8309 and 8207 working faces reached critical mining, the high key stratum was fractured and the mining-induced fracture was developed to the 14# coal seam goaf, which coincided with the field tracer gas measurement results of the 8309 working face, indicating that when the distance between 3 and 5# coal seam and the overlying 14# coal seam goaf is less than 220.9 m, 8309 and 8207 working faces will form the channel for water and gas inrush. (3) The fracture length of the high key stratum above the working face of 8207 is smaller than that of 8309, and the pipeline of water and gas transport channel formed after the critical mining of its working face is larger and wider, which makes it more prone to the disaster of water and gas inrush. Before mining the extra-thick coal seam, it is necessary to detect and pump the water and gas in the 14# coal seam goaf, so as to avoid the water and gas inrush hazard during the coal seam mining. K E Y W O R D Sextra-thick coal seam, fracture characteristics, high key stratum, tracer gas detection, transport channel

show abstract

Simplifying Access to Targeted Protein Degraders via Nickel Electrocatalytic Cross‐Coupling

Neigenfind,

Massaro,

Péter

et al. 2024

Angewandte Chemie

View full text Add to dashboard Cite

C–C linked glutarimide‐containing structures with direct utility in the preparation of cereblon‐based degraders (PROTACs, CELMoDs) can be assessed in a single step from inexpensive, commercial a‐bromoglutarimide through a unique Brønsted‐acid assisted Ni‐electrocatalytic approach. The reaction tolerates a broad array of functional groups that are historically problematic and can be applied to the simplified synthesis of dozens of known compounds that have only been procured through laborious, wasteful, multi‐step sequences. The reaction is scalable in both batch and flow and features a trivial procedure wherein the most time‐consuming aspect of reaction setup is weighing out the starting materials. C–C linked glutarimide‐containing structures with direct utility in the preparation of cereblon‐based degraders (PROTACs, CELMoDs) can be assessed in a single step from inexpensive, commercial a‐bromoglutaramide through a unique Brønsted‐acid assisted Ni‐electrocatalytic approach. The reaction tolerates a broad array of functional groups that are historically problematic and can be applied to the simplified synthesis of dozens of known compounds that have only been procured through laborious, wasteful, multistep sequences. The reaction is scalable in both batch and flow and features a trivial procedure wherein the most time‐consuming aspect of reaction setup is weighing out the starting materials.

show abstract

Study on the Migration Law of Overlying Strata on the Working Surface of Large Mining Height in Y.C.W Coal Mine

Cited by 4 publications

References 2 publications

Experimental Study on Overlying Strata Movement Characteristics and Distributed Optical Fiber Characterization of Stope

Experimental Study on Overlying Strata Movement Characteristics and Distributed Optical Fiber Characterization of Stope

Study on fracture characteristics of high key stratum and development law of water and gas transport channels in Datong mining area

Simplifying Access to Targeted Protein Degraders via Nickel Electrocatalytic Cross‐Coupling

Contact Info

Product

Resources

About