Yanzhou Coal Mining Company Ltd

Zoucheng, China

Yanzhou Coal Mining Company Ltd

Zoucheng, China
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Hu X.-J.,China University of Mining and Technology | Li W.-P.,China University of Mining and Technology | Cao D.-T.,Yanzhou Coal Mining Company Ltd | Liu M.-C.,Huainan Mining Group
Meitan Xuebao/Journal of the China Coal Society | Year: 2012

On the premise of analysis on the development of water flowing fractured zone height by influence of various factors, a new parameter index namely hard-rock lithology ratio was proposed, which insteads of roof strata combination uniaxial compressive strength, avoids determination of statistical problem of uniaxial compressive strength by the type of hard and medium hard, weak, extremely weak roof in the current specification, and doesn't reflect the hard and soft strata combination roof structure. Based on the measured data of fully mechanized water flowing fractured zone of 39 cases, using multiple regression analysis, many factors of non-linear statistic formulas were obtained among height of fully mechanized water flowing fractured zone and mining coal thickness, hard-rock lithology ratio, working face length, mining depth, mining face advance and used for the expected height of water flowing fractured zone in Huainan Xieqiao first face mining.


Huang H.,Shandong University of Science and Technology | Bian H.,Shandong University of Science and Technology | Jin J.,Shanghai Datun Energy Company Ltd | Zhu S.,Yanzhou Coal Mining Company Ltd
Proceedings - 2011 4th International Conference on Information Management, Innovation Management and Industrial Engineering, ICIII 2011 | Year: 2011

This paper designed a greenhouse remote monitoring system based on GSM. In this system, STC89C51RC is used as CPU and SIM900B is used as GSM/GPRS communication module. The temperature sensor, humidity sensor and CO 2 concentration sensor constitute the detection module. The system can show environmental parameters by liquid crystal screen, realize data remote alarming through the GSM module. Users can set standard values and inquire values by cell phone. At the same time, the system can connect the PC for remote data transmission by GPRS module, achieving a simon-pure remote monitoring and control function. © 2011 IEEE.


Zhang K.,CAS Wuhan Institute of Rock and Soil Mechanics | Zhou H.,CAS Wuhan Institute of Rock and Soil Mechanics | Pan P.-Z.,CAS Wuhan Institute of Rock and Soil Mechanics | Shen L.-F.,CAS Wuhan Institute of Rock and Soil Mechanics | And 2 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2010

The study of strength characteristics of rocks under unloading condition is of very importance to the safety evaluation of the underground engineering. There are many factors affecting the strength in unloading test, such as lithology, initial unloading stress, unloading stress path and unloading rate, etc. Among these factors, the unloading rate is concerned in this study. Yield approach rate (YAR) is proposed to denote the stress varying rate under loading and unloading conditions. The YAR under loading and unloading conditions is almost equal when the unloading confining pressure rate is 0.2-0.3 of the loading axial stress rate in general triaxial tests. The simulation by EPCA2D (Elasto-Plastic Cellular Automaton) and the unloading test on marble indicate that the strength of the rock will increase as the unloading rate is higher and the strength under loading and unloading conditions is equal when the unloading rate is 0.2-0.3 of the loading rate. Then the conclusion can be drawn that if the YAR is given and the initial unloading stress is in the elastic state, the unloading stress path has little influence on the strength.


Zhang K.,CAS Wuhan Institute of Rock and Soil Mechanics | Zhou H.,CAS Wuhan Institute of Rock and Soil Mechanics | Feng X.-T.,CAS Wuhan Institute of Rock and Soil Mechanics | Shao J.-F.,Lille University of Science and Technology | And 2 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2010

A lot of research work shows that when rock undergoes plastic deformation, its elastic parameters vary. In order to study the elastoplastic coupling characteristic of rock, cyclic loading experiments on two kinds of marbles are carried out. The experiments show that comparing with conventional triaxial experiments, cyclic loading experiments do not influence the deformation and strength of the rocks. The elastic parameters obviously vary with plastic deformation. When taking the elastoplastic coupling character into consideration, bulk modulus and shear modulus are more suitable to be selected as elastic parameters than elastic modulus and Poisson ratio. The variation of the parameters of strength with plastic internal variable is also obtained under the hypothesis of Mohr-Coulomb yield criterion. The results can provide experimental basis for the furthur study on the elastoplastic coupling constitutive model of rock.


Han X.,Zaozhuang University | Li S.,Zaozhuang University | Pang X.,Yanzhou Coal Mining Company Ltd
Advances in Intelligent and Soft Computing | Year: 2012

To the problem of randomly deployed nodes failing to guarantee the network coverage and the objects detection probability, this study puts forward a coverage optimization algorithm of wireless sensor network based on simplified virtual forces-oriented particle swarm with mutate mechanism (SVF-PS-MA), which would improve the update speed of particle swarm algorithm, guide the direction of particle evolution and speed up the algorithm convergence by dislodging attractive forces from the virtual forces. And this algorithm introduces the mutate mechanism, take the mutation for particles, improve the particles diversity and reduce the probability of particles falling into the local optimization. The result shows that the algorithm can improve the network coverage effectively, and guarantee less time-consumption. © 2012 Springer-Verlag GmbH.


Chen X.,LIAONING Technical University | Li W.,Yanzhou Coal Mining Company Ltd | Yan X.,Yanzhou Coal Mining Company Ltd
Safety Science | Year: 2012

When fully-mechanized caving face passed fault, rock burst accidence easily occurred. The SOS microseism monitoring system was applied to monitor the microseismic activities all time occurred in the coal and rock mass near the fault area. Variation features of microseismic energy releasing and microseismic frequency were analyzed. Numerical simulation method was used to research the abutment stress distribution when coal face passed fault, which was compared with microseism occurrence rules. When the coal face approached to fault, the abutment stress increases gradually, so the high stress would accumulate near the fault region. When the coal face left fault, the abutment stress decreased. The SOS microseism monitoring results showed that microseismic activity in the fault area had a high instability. When the coal face neared to the fault, total energy value and frequency released by the microseism steadily increased. The maximum energy peak value also had the tendency to rapidly increase. Before the strong shock occurred, there was a period of weak seismic activity. The weak seismic activity showed energy accumulation for strong shock, which can be used to forecast the danger of rock burst. © 2011.


He G.-J.,National Institute for Occupational Safety | Ruan G.-Q.,Yanzhou Coal Mining Company Ltd
Meitan Xuebao/Journal of the China Coal Society | Year: 2011

Based on the characteristics of Zhaolou Coal Mine, analyzed the condition of heat sources at open face, heading face and stope face, and also studied the prevention and control measures against the heat disaster from mine construction to mine production in Zhaolou Coal Mine. The research shows that the open face and heading face are mainly in wall rock radiating, coal face is mainly in electrical equipment and hot-water radiating. Considering from mining design, radiation equipment, operating method and personal protection, Zhaolou Coal Mine used all possible ways such as separate ventilation, mechanical radiation, descensional ventilation, reducing working time and make up brine to control the heat disaster from mine construction to mine production. During the coal mine construction period and transitional period, Zhaolou Coal Mine used some refrigeration technology, such as "ground cooling station-spray equipment to cool wind in mine plenum-cooling the ventilation face/ventilation system" and set up a cooling chamber at the parking place of underground mine to centralized refrigeration. All of these get a good cooling result.


Liang D.,China University of Mining and Technology | Jiang Z.,China University of Mining and Technology | Cao D.,Yanzhou Coal Mining Company
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2016

Based on turbulent flow and non-Darcy flow, the hydraulic conductivity calculating formula was derived by using hydraulic pressure in water injection borehole, length of the water injection part, hydraulic pressure and discharge in monitor borehole. With the test results of coal seam floor's water-pressure in a mine, the difference of hydraulic conductivities under different flow status were analyzed, and it shows that the calculating result of hydraulic conductivity is greatly influenced by flow patterns, and the rock masses' permeability can be changed greatly by hydraulic pressure. The paper provides an effective method for calculation of non-Darcy flow hydraulic conductivity in fracture rocks under turbulent flow conditions. © 2016, China University of Mining and Technology. All right reserved.


Huang Z.,China University of Mining and Technology | Jiang Z.,China University of Mining and Technology | Zhu S.,China University of Mining and Technology | Qian Z.,China University of Mining and Technology | Cao D.,Yanzhou Coal Mining Company
International Journal of Rock Mechanics and Mining Sciences | Year: 2014

The hydraulic behavior of the rock formations under coal floor is an important factor to evaluate the risk of floor water inrush, which is difficultly obtained exactly by laboratory hydraulic tests. For the purpose of obtaining the hydraulic conductivity of the rock formations between deep coal and aquifers and further evaluating the risk of floor water inrush, water injection tests are carried out at Baodian coal mine. Through drilling four boreholes, three water injection tests of three rock formations are carried out and the hydraulic conductivity of the rock formations is calculated. Experimental results analysis shows that the three test rock formations are low-permeability. The hydraulic conductivity propagation with injection pressure can be divided into two phases that include stable change phase and increase phase due to hydraulic fracturing. In addition, the crack connections and propagations model can be used to analyze the change process of hydraulic conductivity of rock formations under water pressure. It is a useful approach for obtaining the hydraulic conductivity of deep rock formation, evaluating the risk of floor water inrush, preventing water inrush and raising the coal mining efficiency in colliery. © 2014 Elsevier Ltd.


Yang P.-J.,China University of Mining and Technology | Yang P.-J.,Yanzhou Coal Mining Company Ltd | Liu C.-Y.,China University of Mining and Technology | Wu F.-F.,China University of Mining and Technology
Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology | Year: 2012

Field measurements and simulations of the evolution and appearance of mining induced fracture are used to explain the development of rip falls. The mechanics behind these falls is discussed. Results show that a coal seam with bedding only has a mining induced fracture plane consisting of two conjugate planes with an inverse incline. Jointed coal seams have a fracture plane consisting of a sheared crack plane and an open plane in the joints. These have an inverse incline in hard coal, relative to the goaf, but one set shear plane inclining to the goaf in soft coal. Slip-line theory can identify the danger zone by the coal wall. The main factor that induces instability in the wall is the unsupported roof length of the tip-face and the pressure on the voussoir beam.

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