Yongcheng Coal and Electricity Holding Group Co.

Henan’an, China

Yongcheng Coal and Electricity Holding Group Co.

Henan’an, China
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A systematic method was developed to evaluate the risk of water inrush through a coal seam floor using the geographic information system (GIS) and the fuzzy set theory. The main geological and hydrogeological indicators that control water inrush were first considered using a fuzzy mathematics approach, in which fractal analysis was carried out to quantify the fault’s characteristics. The degree of membership was determined using GIS, the weight of every factor was considered by calculating the entropy in accordance with Shannon’s information entropy theory, and the level of risk of the evaluated object was derived using the maximum membership principle. The approach was validated by a case study at the Chensilou mine in Henan Province, China, where the aquifers that underlie an exploitable coal seam, II2, were made impermeable by grouting. Data from Nov. 2014 to April 2016 shows that the risk of water inrush was reduced in Panel 2517 of the II2 coal seam, that there were no serious disturbances in this panel and no groundwater inrush through the floor. This method can be a powerful tool for systematically assessing the risk of water inrush through the floor, since the influence of several factors can be quantitatively considered in accordance with the geological and mining conditions. © 2017 Springer-Verlag Berlin Heidelberg

Gao M.-S.,China University of Mining and Technology | Zhao G.-D.,China Coal Technology and Engineering Co. | Liu B.-T.,Yongcheng Coal and Electricity Holding Group Co. | Zhao Y.-C.,China University of Mining and Technology | Zhang M.-H.,Yongcheng Coal and Electricity Holding Group Co.
Meitan Xuebao/Journal of the China Coal Society | Year: 2014

Using TDS-6 microseismic monitoring system, through the in-situ blasting analogical test in roadway, the action effects of shock wave on roadway surrounding rock and the response characteristics in different sections were studied. The results show that: (1) The shock wave attenuates exponentially as E=E0e-ηl with the distance increase to seismic source, that is, the explosion shocks violently at the beginning and attenuates quickly, the amplitude decreases significantly after 20 meters and becomes very weak after 30 meters; (2) The response characteristics of roadway surrounding rock differ significantly in different locations of the same section, that is, the floor is suffered most seriously, the two sides take the second place, and the roof and the humeral angles are the worst. It shows that rock burst just have destructive effect on the coal rock near to the seismic source, and on the same section but different locations the characteristics of the response to the shock wave in roadway surrounding rock is different.

Gao M.-S.,China University of Mining and Technology | Gao M.-S.,Yongcheng Coal and Electricity Holding Group Co. | Guo C.-S.,Zhongping Energy Chemical Group | Li J.-F.,China University of Mining and Technology | And 2 more authors.
Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology | Year: 2011

Stabilizing the load bearing structure of a roadway roof when it consists of a thick, soft layer can not be done with a set of equal-length anchors. This is because the roof will separate and deformation will destroy the structure. A multi-length support method is proposed. The lower roof is supported with bolts that form a shell. Then a second set of middle length anchors are installed into the roof that make a second load bearing structure. Thirdly, the long anchors are installed deeply into the roof that form a compositing bolted bearing structure. Thus, the thick soft layer of the roof is controlled by this multi-step, three dimensional support structure because of the load bearing strength and thickness it creates. A theoretical analysis of the support is presented. A successful application of the technology in the 11151 gateway of the Guqiao mine is described. The separation of the lower roof of roadway was about 10 and 14 millimeters, and the maximum separation in the deep roof was about 23 millimeters.

Gao M.-S.,Yongcheng Coal and Electricity Holding Group Co. | Gao M.-S.,China University of Mining and Technology | Yan G.-F.,China University of Mining and Technology | Yang Q.-S.,Yongcheng Coal and Electricity Holding Group Co. | And 3 more authors.
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2011

The-593 m air-return crosscut of No.11 coal mine in Pingdingshan Mining Group had been repaired repeatedly, the loose and destroy zone of the surrounding rock was between 2.5 to 4.0 m, and even reached 6.0 to 7.0 m in local region, which had been greatly in excess of the conventionally anchorage zone. In that case, some active supports (anchor bolt, cable, et al) couldn't control the deformation of the roadway surrounding rock, and the roadway condition got worse after repeated repairing, which seriously affected and restricted the development stretching and supersedure of mining levels. By adopting the load-bearing shell principle of anchor-shed-grout, on the base of active long cable support and passive U-steel shed support, as well as grouting to strengthen the roadway between anchors and sheds, a small region of load-bearing shell of anchor-shed-grout, with certain thickness and strength, is formed within the superficial surrounding rock of large loose and destroy zone, to maintain the stability of roadway effectively and chronically. After the air-return crosscut being repaired for one year, the maximal roof convergence and two sides convergence was 324 mm and 354 mm, respectively. The engineering application shows that the established parameters of the repairing technology were reasonable and then the maintenance effect of roadway was remarkable, which can be applied as a reference in the repairing practice of similar destructive roadways.

Cao Z.-A.,Yongcheng Coal and Electricity Holding Group Co. | Qi Z.-W.,Yongcheng Coal and Electricity Holding Group Co.
Environment, Energy and Sustainable Development - Proceedings of the 2013 International Conference on Frontier of Energy and Environment Engineering, ICFEEE 2013 | Year: 2014

This paper expounds the relationships between method of modern safety management and process management from two aspects for the formation and maintenance of safety configuration; it uses the theory and method of current futures transaction, establishes the model of safety option for formation and maintenance of safety configuration, performs system design for the transaction terms of safety resource with this model, and applies for the configuration, evaluation and exchange of individual and sub-unit safety resource, finally forms that under the guidance mechanism of safety option, it establishes a new mode of site safety management by using method of buy and short selling option between enterprise, sub-unit and employees, and can expand to build the social safety resource. © 2014 Taylor & Francis Group, London.

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