Mining-induced stress changes and rock burst control in a variable-thickness coal seam

Zhu, Guang-an; Li, Dou; Li, Zhenlei; Cai, Wu; Kong, Yong; Li, Jing

doi:10.1007/s12517-016-2356-3

Cited by 36 publications

(15 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the Tashan mine, the length of the 8107 working face of the No. 3-5 thick coal seam is 207 m. The mining thickness and seam depth are [14][15][16][17][18].42 m and 470 m, respectively. Although the working face is supported via high-resistance ZF15000/28/52 supports, support-crushing accidents frequently occur.…”

Section: Engineering Backgroundmentioning

confidence: 99%

“…To control the high mining pressure occurring in the overlying structures, hydraulic fracturing and blasting has been developed to deal with the stress concentration based on weakening the hard roof [5,[10][11][12][13][14]. Hydraulic fracturing is achieved by using fracturing equipment and high pressure water [12]; the blasting is done by placing an explosive in the borehole [14].…”

Section: Introductionmentioning

confidence: 99%

“…Hydraulic fracturing is achieved by using fracturing equipment and high pressure water [12]; the blasting is done by placing an explosive in the borehole [14]. Through such methods, the overlying strata with well-developed fractures are more likely to cave.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Reduction of Stress Acting on a Thick, Deep Coal Seam by Protective-Seam Mining

Gao

Xia

et al. 2017

Energies

View full text Add to dashboard Cite

Aiming to reduce the high mining stress observed in large-space roof structures during mechanized mining of thick coal seams, a control technique based on protective-seam mining is proposed. This technique was used to investigate the 8108 working face of the No. 3-5 thick coal seam of the Tashan mine located in the Datong area of Shanxi, China, by means of simulations and field measurements. The numerical simulation revealed that the No. 3-5 coal seam undergoes expansion and deformation, accompanied by stress relief due to the mining of the overlying No. 4 coal seam. The physical simulation demonstrated that mining the protective seam changes the structural characteristics of the overlying strata in advance and reduces the integrity of the roof in the No. 3-5 coal seam. Field measurements showed that the support loads in the 8108 working face are significantly weaker than those in the adjacent 8107 working face, where protective-seam mining was not performed. In the absence of high resistance on the support and distinct periodic weighting characteristics, the rock masses around the 8108 working face and roadway could be easily supported.

show abstract

Section: Engineering Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Reduction of Stress Acting on a Thick, Deep Coal Seam by Protective-Seam Mining

Gao

Xia

et al. 2017

Energies

View full text Add to dashboard Cite

show abstract

“…Because high level stresses easily accumulate a high elastic energy in the surrounding rock, it has been recognized as a primary mechanism of rockburst in the mine [18,19]. Many studies on the mechanism of rockburst in the roadway were essential to analyse the source of high stress [20][21][22][23]. However, the failure laws of the surrounding rock under specific stress conditions have not been adequately studied.…”

Section: Introductionmentioning

confidence: 99%

The Criteria of Underground Rock Structure Failure and Its Implication on Rockburst in Roadway: A Numerical Method

Guo

Zhao

Gao

et al. 2019

Shock and Vibration

View full text Add to dashboard Cite

Rockburst in roadway happened along with a large-scale destruction of the surrounding rock. To study the failure laws of the surrounding rock in the process of rockburst in roadway, the evolution behaviors of the plastic zone and the criteria of large-scope failure were studied by using FLAC numerical simulation. Meanwhile, the stress response laws of the plastic zone were studied by loading or unloading in a single direction. The results showed that, in the 20 MPa stress environment, large-scale failure zone would appear when the maximum confining pressure was loaded to 50 MPa or the minimum confining pressure was unloaded to 6 MPa. Loading in the direction of maximum confining pressure or unloading in the direction of minimum confining pressure, when the stresses reached a certain limit, could lead to a large-scale expansion to the failure zone of the surrounding rock a roadway. Meanwhile, the stress response of the plastic zone became more sensitive, which might easily trigger rockburst in roadway. In addition, two sine qua nonstress conditions for rockburst in roadway were determined: high stress ratio and high stress level. This might provide a theoretical basis for the stress source mechanism of roadway rockburst.

show abstract

“…Among these the FLAC code is a well-known computer code for such analysis of rock engineering problems using the FVM/FDM approach with a vertex scheme of triangular and/or quadrilateral grids [18,19]. Application of FLAC codes in the modelling of the exploitation of multiple coal seams was widely described by Kwaśniewski and Wang [20], Kook et al [21], Han et al [22], Pilecki [23], Wesołowski [24], Zhang et al [25], Sui et al [26], Zhu et al [27].…”

Section: Introductionmentioning

confidence: 99%

Comparison of an empirical S-wave velocity model and a calculated stress-strain model for a rock mass disturbed by mining

Krawiec

Czarny

2017

E3S Web of Conferences

View full text Add to dashboard Cite

Abstract. In the article a comparison analysis is presented between a numerical model of the stress and deformation state in a rock mass and an S-wave velocity model obtained as a result of in situ measurement. The research was conducted using data from the Jastrzębie and Moszczenica coal mines. The part of the rock mass examined was strongly disturbed by multi-seam exploitation of coal. To obtain the S-wave velocity model 6 hours of ambient seismic noise data were recorded using 11 seismometers. The propagation of the Rayleigh surface wave between the seismometers was reconstructed utilising the seismic interferometry and the cross correlation technique. Estimation of a two dimensional model of the Swave velocity field was performed on the basis of dispersion curves of the Rayleigh wave phase velocity. The stress and deformation field were calculated assuming a plane state of stress with the use of the elastic-plastic Coulomb-Mohr strength criterion. Images of the vertical stress, horizontal stress, vertical strain and horizontal strain as well as the subsidence profile on the model surface were obtained as a result of the calculation. Analysis of the results shows correlation between the field of S-wave velocity and the modelled field of stress and strain.

show abstract

Mining-induced stress changes and rock burst control in a variable-thickness coal seam

Cited by 36 publications

References 13 publications

Reduction of Stress Acting on a Thick, Deep Coal Seam by Protective-Seam Mining

Reduction of Stress Acting on a Thick, Deep Coal Seam by Protective-Seam Mining

The Criteria of Underground Rock Structure Failure and Its Implication on Rockburst in Roadway: A Numerical Method

Comparison of an empirical S-wave velocity model and a calculated stress-strain model for a rock mass disturbed by mining

Contact Info

Product

Resources

About