Stress evolution with time and space during mining of a coal seam

Yang, Wei; Lin, Baiquan; Qu, Yong-an; Li, Ziwen; Zhai, Cheng; Jia, Lili; Wuqiang, Zhao

doi:10.1016/j.ijrmms.2011.07.006

Cited by 137 publications

(51 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…8. A study has showed that the mining-affected zone within the working face could extend as far as tens of meters, sometimes even over 100 m (Yang et al 2011).…”

Section: Measurement Methodsmentioning

confidence: 99%

Changes in Frequency of Electromagnetic Radiation from Loaded Coal Rock

et al. 2015

View full text Add to dashboard Cite

To understand the relationship between the frequency of electromagnetic radiation (EMR) emitted from loaded coal rock and the micro-crack structures inside it, and assess the stress state and the stability of coal rock by analyzing frequency changes in characteristics of its emitted EMR, we first experimentally studied the changes in time sequence and the frequency spectrum characteristics of EMR during uniaxial compression, then theoretically derived the relationship between the principal frequency of EMR signals and the mechanical parameters of coal crack and analyzed the major factors causing the changes in the principal frequency, and lastly verified the results at Nuodong Coal Mine, Guizhou Province, China. The experimental results showed that (1) EMR intensity increased with the applied stress on loaded coal rock during its deformation and failure and could qualitatively reflect the coal's stress status; (2) with the applied stress increasing, the principal frequency gradually increased from near zero to about 60 kHz and then dropped to less than 20 kHz. During this period, coal rock first stepped into the linearly and elastically deformed stage and then ruptured around the peak load. Theoretical analysis showed that there was a negative correlation between the principle frequency and the size of internal cracks. Field detection showed that a lower principle frequency was generated from coal rock applied by a greater load, while a higher principal frequency was generated from coal rocks suffering a weaker load.

show abstract

“…8. A study has showed that the mining-affected zone within the working face could extend as far as tens of meters, sometimes even over 100 m (Yang et al 2011).…”

Section: Measurement Methodsmentioning

confidence: 99%

Changes in Frequency of Electromagnetic Radiation from Loaded Coal Rock

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Таким образом, обоснован весь комплекс исход-ных горно-геологических и горнотехнических пара-метров для максимально достоверного моделирова-ния процессов сдвижения слоистой углевмещающей толщи в окрестности подготовительной выработки (Yang et al, 2011).…”

Section: проведение вычислительных экспериментовunclassified

Development and analysis of computational model of geomechanical system “layered massif – working support”

Fomychov¹,

Pochepov²,

Lapko³

et al. 2016

Min. miner. depos.

View full text Add to dashboard Cite

Purpose. Substantiating the method for forecasting rock pressure manifestation in the system "layered massifworking support" on the basis of displacement patterns detection at any arbitrary point of the preparatory working circuit during the computational experiments. Methods.Computational experiments were carried out on the basis of the finite element method using the solid computational domain, provided superlimiting non-linear behavior of the simulated materials. The use of numerical grid methods allows creating geometrically and physically complex simulation models and manipulate their state within a wide range.Findings. The calculations defined that with weak links between adjacent strata, acting shear stresses destroy them in the vicinity of working, and the contiguous rock strata deform with mutual sliding. Analysis of reduced stress area allows to substantiate with accuracy sufficient for mining computations a unified average structure of the computational domain that most comprehensively reflects all the main features of a real mining massif which are likely to influence computational error. This choice ensures the introduced error value within 10% in the entire range of mechanical parameters change of the rock massif strata.Originality. Stress-strain state of frame support and patterns of its change with increasing mining depth are nonlinear, especially with nearby rock strata entering the superlimiting state; formation of the plastic hinges system along the frame support circuit, which causes the development of such replacements that exclude the possibility of further working exploitation.Practical implications. The proposed method allows to determine the optimal indicators of maintaining a working driven in the finely-layered rock massif, which makes it possible to significantly reduce operation costs.

show abstract

“…One commonly recognized division is consisted of stress relaxation zone, stress enhancement zone and stress stabilization zone, or other similar definition [12]. The partition is as shown in Figure 1.…”

Section: Three "Zones" Of the Multi-seam Coal Mining Structurementioning

confidence: 99%

Lateral Stress Concentration in Localized Interlayer Rock Stratum and the Impact on Deep Multi-Seam Coal Mining

Zhang¹,

Shimada²,

Sasaoka³

et al. 2013

IJG

View full text Add to dashboard Cite

To explore the impact of lateral stress concentration in interlayer rock stratum on the exploitation of protected coal seam, a field experiment was carried out in a multi-seam mining structure. Lateral stress redistribution and interlayer rock failure behavior were surveyed. Then an assistant numerical investigation was implemented to evolve the effect of liberated seam mining and its influence on stress reconstruction in surrounding rock mass. The cause of lateral stress concentration and its impact were discussed finally. Key findings turn out that a certain lateral stress increases in interlayer rock stratum and concentrates on its lower region. Lateral stress concentration and interlayer rock failure are interactional. The former is an inducing factor of the latter; the latter promotes the increase of concentration degree. Extent of lateral stress concentration increases to the maximum as seam distance is about 50 m. But the efficacy of liberated seam mining decreases as the seam spacing gets larger. Protected seam mining is then classified based upon the impact of lateral stress concentration, which helps to prevent the rock burst hazard and then to achieve a reliable mining in deep mines.

show abstract

Stress evolution with time and space during mining of a coal seam

Cited by 137 publications

References 12 publications

Changes in Frequency of Electromagnetic Radiation from Loaded Coal Rock

Changes in Frequency of Electromagnetic Radiation from Loaded Coal Rock

Development and analysis of computational model of geomechanical system “layered massif – working support”

Lateral Stress Concentration in Localized Interlayer Rock Stratum and the Impact on Deep Multi-Seam Coal Mining

Contact Info

Product

Resources

About