Liu H.,China University of Mining and Technology |
Cheng Y.,China University of Mining and Technology |
Zhao C.,Yangquan Coal Industry Group Co. |
Wang H.,China University of Mining and Technology |
Chen H.,China University of Mining and Technology
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2010
The exploitation of the protective layer and pressure-relief gas drainage is an effective primary method to eliminate coal and gas outburst and it is widely used in many mineral fields. In order to improve the effectiveness, safety and economy of the protective layer mining, a set of numerical equations of elasto-brittle-plastic constitutive model of coal rock mass damage due to mining are set up based on the plastic flow format of Drucker-Prager constitutive model in fast Lagrangian analysis of Continua in 3-dimension continua(FLAC3D). And the model is modified by using the inscribed circle criterion and the ideal brittle-plastic model. The model is developed into DLL file in VC++2005 programming environment for FLAC3D; and the correctness and rationality of this model used to study the brittle strain-softening characteristics of coal rock mass due to mining are validated by comparing with uniaxial and triaxial compression numerical tests. This model is used to simulate the super-remote protected seams exploitation of Xinjing coal mine in Yangquan coal field. The results show that the protected layer lies in the top edge of fractured zone 125 m away from the protected layer; and the relieved gas in the super-remote protected layers could be better drained utilizing the mining influence of the protective layer. And the conclusions agree with that of the similar experiment, which indicates that the elasto-brittle-plastic constitutive model of coal rock mass damage due to mining could be used to preliminary evaluation of protective layer mining and relief-pressure gas drainage. Simulation results may bring forward reasonable suggestions for the design of protective layer mining and relief-pressure gas drainage.
Yang H.-M.,Henan Polytechnic University |
Zhang T.-G.,Henan Polytechnic University |
Wang Z.-F.,Henan Polytechnic University |
Zhao C.-C.,Yangquan Coal Industry Group Co.
Meitan Xuebao/Journal of the China Coal Society | Year: 2010
The displace desorption characteristics for methane adsorption equilibrium coal samples of Yangquan anthracite were studied by method of nitrogen injection at 30°C in laboratory. The results indicate that adsorptive capacity of methane begin to decrease after the mixture pressures is high than 2.25 MPa. In order to accelerate coal seam methane emission, a series of underground experiment of nitrogen injection into coalbed were also completed in Shigang Coal Mine of Yangquan Mining Group. The results indicate that pure methane drainage flow in these bore holes within 2 meters increase more than 2 times after nitrogen injection 16 hours, and the concentration of methane desorbs from coal sample decrease from 97.29% to 79.66%, nitrogen concentration increase from 0.80% to 13.19%. Correspondingly, residual gas content in coal seam decrease from 9.77 cm3/g to 8.68 cm3/g. In conclusion, the technology of nitrogen injection into coalbed receive a good effect in accelerating methane drainage.
Fangtian W.,China University of Mining and Technology |
Cun Z.,China University of Mining and Technology |
Shuaifeng W.,China University of Mining and Technology |
Xiaogang Z.,China University of Mining and Technology |
Shenghua G.,Yangquan Coal Industry Group Co.
Tunnelling and Underground Space Technology | Year: 2016
Strata control technology for roadways with loose and fractured surrounding rock is one of the most challenging areas in underground roadway support. Based on the case of the serious deformations that occurred in a western main roadway of a Chinese coal mine, this paper analyzes the characteristics and influencing factors of deformation of roadways with loose and fractured surrounding rock. A mechanical model of the roadway's surrounding rock has been established to study the different forces at play in the plastic zone of the roadway via means of site observation, theoretical analysis, numerical simulation and onsite experiments. Based on the double shell anchor-grouting reinforcement mechanism, whole section anchor-grouting reinforcement technology (WSAGRT) was implemented in the coal mine with the pertinent support parameters optimized by numerical simulation. The results show that the deformation of the rock surrounding the roadway has been held in check effectively, and thus WSAGRT warrants a safer and more effective mining environment. © 2015 Elsevier Ltd.
Hu G.,China University of Mining and Technology |
Hu G.,Yangquan Coal Industry Group Co. |
Xu J.,China University of Mining and Technology |
Zhang F.,Yangquan Coal Industry Group Co. |
And 3 more authors.
Energies | Year: 2015
The Yangquan coalfield is one of the typical highly gassy mining areas in China. However, its coal seams are of lower permeability, which are not conductive to coalbed methane (CBM) drainage. In this study, based on the theory of the ground movement, we analyzed the principle of coal and CBM coextraction in the Yangquan coalfield, and established the technology system of coal and CBM coextraction which was further implemented in the coal and CBM coextraction in the Yangquan coalfield. The coal and CBM coextraction technologies based on the "pressure-relief and permeability-increase" effect caused by the mining overburden movement can optimally ensure the safe and efficient mining and improve the gas drainage rate. A series of developed coal and CBM coextraction technologies for the Yangquan coalfield were mainly characterized by the high-level gas drainage roadway. This reached a maximum gas drainage amount of 270,000 m3/day for single drainage roadway and a pressure-relief gas drainage rate of >90%. Those technologies significantly improved the gas drainage effect safely and efficiently achieving the coal and CBM coextraction.
Yang J.,China University of Mining and Technology |
Fu S.,China University of Mining and Technology |
Wang D.,YANGQUAN COAL INDUSTRY GROUP CO.
2015 IEEE International Conference on Mechatronics and Automation, ICMA 2015 | Year: 2015
For the coal mine underground coal mining working face scraper conveyor usually work starts with load, in order to get the accurate dynamic scraper conveyor starting characteristics, using AMEsim dynamic simulation software of finite element modeling of the scraper conveyor, and then using the viscoelastic mechanics model of the dynamic analysis of scraper conveyor, scraper conveyor are starting the process of chain tension and the velocity and displacement of the 2D and 3D change trend. Lay the theoretical foundation for reasonable selection mode. © 2015 IEEE.