Abstract
The overlying strata spatial structure of isolated working face under thick-hard strata is complex, and the overlying strata movement is drastic. Rock burst in this kind of isolated working face is easy to occur under the influence of mining depth and geological structure. Aiming at the safety problems caused by the overlying strata movement deformation of the isolated working face under deep mining, one similar model of the thick-hard strata on the working face is built. The overlying strata structure and its evolution characteristics in the mining process of working face are studied by using a similar material simulation test. The results show that the overlying strata structure above the isolated working face is long-arm T-type spatial structure in the vertical section, and the coal body at the corner of isolated working face forms the stress concentration region. In addition, with the increase of the mining range, the coal pillar in the upper and lower sections compress and sink, resulting in the gob range increases, and the overlying strata re-move on both sides of isolated working face, the long-arm T-type overlying strata fracturing after reaching the limit of suspension, causing the isolated working face instability. It can be seen that the long-arm T-type structure is prone to large scale fracture movement of the key strata, and the risk of inducing strong rock burst is high. Therefore, when mining by strip method, the mining range of the working face on both sides of isolated working face should be increased, or the technology of cutting roof and pressure relief should be adopted to avoid the formation of long-arm T-type spatial structure above the isolated working face, so as to reduce the occurrence of rock burst.
Similar content being viewed by others
References
Bornyakov SA, Panteleev IA, Tarasova AA (2016) Dynamics of intrafault deformation waves: results of physical simulation. Dokl Earth Sci 471:1316–1318
Cao AY, Zhu L, Li F (2014) Characteristics of T-type overburden structure and tremor activity in isolated face mining under thick-hard strata. J China Coal Sci 39:328–335
Chong KP, Kuruppu MD (1987) Fracture toughness determination of layered materials. Eng Fract Mech 28:43–54
Dou LM, He H (2012) Study of OX-F-T spatial structure evolution of overlying strata in coal mines. Chin J Rock Mech Eng 31(3):453–460
Haimson B, Ovacich J (2003) Borehole instability in high-porosity Berea sandstone and factors affecting dimensions and shape of fracture-like breakouts. Eng Geol 69(3):219–231
Hou W, Huo HY (2012) Stope rock movement rule of C-shaped of overlying strata spatial structure and disaster causing mechanism of dynamic pressure. J China Coal Soc 37(2):269–274
Jiang FX (2006) View point of spatial structures of overlying strata and its application in coal mine. J Min Saf Eng 23(1):30–33
Jiang JQ, Zhang PP, Nie LS (2014) Fracture laws and dynamic response analysis of high-position hard thick strata. Chin J Rock Mech Eng 33(7):1366–1374
Mousavi Nezhad M, Fisher QJ, Gironacci E, Rezania M (2018) Experimental study and numerical modeling of fracture propagation in shale rocks during Brazilian disk test. Rock Mech Rock Eng 51:1755–1775
Shi H, Jiang FX (2004) Mechanical analysis of rupture regularity of hard and massive overlying strata of longwall face. Chin J Rock Mech Eng 23(18):3066–3069
Wang P, Jiang JQ, Zhang PP, Wu QL (2016) Breaking process and mining stress evolution characteristics of a high-position hard and thick stratum. Int J Min Sci Technol 26:563–569
Yang PJ, He Y, Guo WB (2013) Disaster-causing mechanism and control measures of extremely thick and hard magmatic rock above working face. J China Coal Soc 38(12):2016–2112
Acknowledgements
This study was funded by the National Natural Science Foundation of China (No. 51704152), the Natural Science Foundation of Shandong Province (Nos. ZR2017PEE018, ZR2019BEE013, and ZR2017BEE001).
Author information
Authors and Affiliations
Corresponding authors
Additional information
Publisher's Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Rights and permissions
About this article
Cite this article
Jia, C.Y., Wang, H.L., Sun, X.Z. et al. Similar Material Simulation Test of Overlying Strata Characteristics of Isolated Working Face Mining with Thick-Hard Strata. Geotech Geol Eng 38, 1121–1132 (2020). https://doi.org/10.1007/s10706-019-01076-9
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10706-019-01076-9