Permeability Enhancement Induced by Fracture Shear Dilation During Close-Range Coal Seam Mining
Source abstract
Abstract
The advance of the working face in coal seams alters the local stress field and may give rise to fractures in the vicinity of the excavation. In this study, a constitutive model in which damage is defined as a function of volumetric strain was established and utilized in a numerical model to prognosticate the fracture development around the excavation. The predicted fractures that emerged in the overlying rock mass were found to exhibit hybrid characteristics. A permeability model was also constructed, taking into account both tension- and shear-induced fracture development. The permeability increase of the upper adjacent coal seam is most notable within 40 m from the goaf boundary. As the working face progresses, the permeability of the upper adjacent coal seam is further enhanced while that of the lower adjacent coal seam remains unaffected. The permeability at the goaf boundary is high and reaches its maximum at the rear of the working face, indicating that for the permeability change, the effect of shear-induced dilation plays a more crucial role than that of pressure-dependent compaction. This study can be used to guide the design of coal seam methane drainage for the mining of closely spaced coal seams.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Rock Mechanics and Modeling · Coal Properties and Utilization · Geoscience and Mining Technology
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
State Key Laboratory of Coal and CBM Co-Mining, Jincheng 048012, China
National Joint Engineering Laboratory of Internet Applied Technology of Mines, China University of Mining and Technology, Xuzhou 221116, China
Funding
Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province
References (42)
Show source-provided references
1. Fan, C.J., Yang, L., Wang, G., Huang, Q.J., Fu, X., and Wen, H.J. (2021). Investigation on coal skeleton deformation in co2 injection enhanced CH4 drainage from underground coal seam. Front. Earth Sci., 9.10.3389/feart.2021.766011 ↗
2. Experimental research of safe and high-efficient exploitation of coal and pressure relief gas in long distance
3. Test and application of coal seepage characteristics under the condition of ming
4. Study on “coal and coal-bed methane simultaneous extraction” technique on the basis of strata movement
5. Development of gas extraction technology in coal mines of China
6. Numerical simulation of gas migration into mining-induced fracture network in the goaf10.1016/j.ijmst.2017.05.015 ↗
7. Analysis on mining-induced crack development features of seam with medium thick magmatic rock roof
8. Experimental analysis of dynamic evolution model of mining-induced fissure zone in overlying strata
9. Design on borehole drilling site for mine gas drainage based on gas migration features in goaf
10. Stress-dependent deformation and permeability of a fractured coal subject to excavation-related loading paths10.1007/s00603-021-02520-0 ↗
11. Mechanical criterion for coal and gas outburst: A perspective from multiphysics coupling10.1007/s40789-021-00447-z ↗
12. Fan, C.J., Wen, H.J., Li, S., Bai, G., and Zhou, L.J. (2022). Coal seam gas extraction by integrated drillings and punchings from floor roadway considering hydraulic-mechanical coupling effect. Geofluids, 5198227.10.1155/2022/5198227 ↗
13. Research progress on pressure released gas drainage technology of mining cracking zone in overburden strata of coal mine in China
14. Research on green mining of coal resources in China: Current status and future prospects
15. Circular overlying zone at longwall panel for efficient methane capture of multiple coal seams with low permeability
16. Study on O-ring characteristics of mining-induced fracture distribution in overburden
17. Xu, J.L., and Qian, M.G. (2004). Study and application of mining-induced fracture distribution in green mining. J. China Uni. Min. Technol., 2.
18. Some aspects of mining under aquifers in China10.1016/0167-9031(90)90878-V ↗
19. Karmis, M., Triplett, T., Haycocks, C., and Goodman, G. (1983, January 20–23). Mining Subsidence and Its Prediction in The Appalachian Coalfield. Proceedings of the ARMA US Rock Mechanics/Geomechanics Symposium, College Station, TX, USA.10.1016/0148-9062(83)91771-0 ↗
20. Influence of physical characteristics of weak rock mass on height of caved zone over abandoned subsurface coal mines10.1007/s00254-002-0542-y ↗
21. Huang, Z.A., Zhang, Y.H., Li, S.B., and Ni, W. (2006). Application of FLAC in determining the upper and low boundary of the fracturing zone in Shaqu coal mine. Min. Res. Dev., 1.
22. Caving thickness effects on distribution and evolution characteristics of mining induced fracture
23. Study on dynamic distribution characteristics of mining-induced fractures in overburden ellipsometry zone
24. Visual exploration of fissure field of overburden and rock
25. Experimental Study on the Change of the Pore-Fracture Structure in Mining-Disturbed Coal-Series Strata: An Implication for CBM Development in Abandoned Mines10.1021/acs.energyfuels.0c03281 ↗
26. Research on cracking variation of separated strata in roof of fully mechanized caving mining face
27. Reservoir simulation-based modeling for characterizing longwall methane emissions and gob gas venthole production
28. Gas emission prediction and recovery in underground coal mines10.1016/S0166-5162(97)00007-4 ↗
29. Principles and applications of exploitation of coal and pressure relief gas in thick and high-gas seams
30. Safe and efficient co-mining system of coal and gas in coal seam group and application
31. Influence of combination forms of intact sub-layer and tectonically deformed sub-layer of coal on the gas drainage performance of boreholes: A numerical study10.1007/s40789-020-00317-0 ↗
32. Quantitative study on coal permeability evolution with consideration of shear dilation10.1016/j.jngse.2016.05.007 ↗
33. Influence of damage and dilatancy on permeability evolution of fractured coal
34. Statistical softening constitutive model of rock damage considering the influence of damage threshold and its parameter determination method
35. A continuous damage mechanics model for ductile fracture10.1115/1.3225775 ↗
36. Itasca Consulting Group, Inc (2002). FLAC3D User Manuals, Version 2.1, Itasca Consulting Group, Inc.
37. Desai, C.S., and Siriwardane, H.J. (1984). Constitutive Laws for Engineering Materials with Emphasis on Geological Materials, Prentice-Hall.
38. Mechanism of Single Proppant Pressure Embedded in Coal Seam Fracture10.1021/acs.energyfuels.0c04360 ↗
39. A shear dilation stimulation model for production enhancement from naturally fractured reservoirs10.2118/78355-PA ↗
40. A fractal-based model for fracture deformation under shearing and compression10.1007/s00603-013-0367-x ↗
41. On the normal-stress dependence of fracture hydraulic properties including two-phase flow properties10.1007/s10040-012-0915-6 ↗
42. Itasca Consulting Group, Inc (2013). Online Contents for 3 Dimensional Distinct Element Code (3DEC Version 5.0), Itasca Consulting Group, Inc.