Yima Coal Group Co Ltd

Sanmenxia, China

Yima Coal Group Co Ltd

Sanmenxia, China

Time filter

Source Type

Cai W.,China University of Mining and Technology | Cai W.,Key Laboratory of Deep Coal Resource Mining CUMT | Dou L.-M.,China University of Mining and Technology | Li Z.-L.,China University of Mining and Technology | And 4 more authors.
Chinese Journal of Geophysics (Acta Geophysica Sinica) | Year: 2014

As the depth and intensity of coal mining increase, rockbursts have been common security issues in coal mines. For solving the difficult problem of the spatio-temporal forecasting of rock bursts, the method of the spatio-temporal forecasting for rock bursts was further developed using microseismic multidimensional information (MMI). First, the index system of MMI identification was established, including the preferred index about the frequency and the proposed indexes about the hypocenter concentration,the maximum and total equivalent stresses. Secondly, the temporal sequence curves and the spatial contour nephograms of each index were obtained based on the normalization method, the classification scriteria of anomaly, and the spatially and temporally statistical smoothed model. Moreover, the score method of R-value was adopted to evaluate and verify the forecasting efficiency of each index, and further determine the weights for each index.Finally,using the method of comprehensive anomaly index, the dangerous state, the specific hazardous areas and levels of rock burst were quantitatively analyzed in real time for the monitoring area. A forecasting example shows that this method has considered the microseismic time-space-strength factor, and played a better prediction on the rock burst.Specifically, it can quantitatively describe the dangerous state of rock burst for the monitoring area in time; reflect the hazardous areas and levels of rock burst in space; and guide the implementation of the measures to control rock burst in the field.Therefore, this study can, to some degree, solve the blindness in implementing the measures to control rock burst, and further develop the approach to monitor and forecast rock burst in space and time.


Zhao S.,China University of Mining and Technology | Li L.,China University of Mining and Technology | Wu B.,Mine Safety Technology Branch of CCRI | Liu J.,Yima Coal Group Co Ltd | Ouyang Z.,Mine Safety Technology Branch of CCRI
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2016

The small deflection theory of elastic thin plate has been used to analyze the roadway floor stress condition and the main influence factors of floor rock burst have been figured out. Theory analysis and numerical simulation have been used to study the rock burst prevention mechanism and optimization scheme about deep hole floor-break blasting and the control effect have been tested in practice. It has been found that the mining horizontal stress is the key reason for floor heave and the layer thickness of floor, and that mechanical properties and the supporting intensity of roadway surrounding rock are the main influence factors of floor heave. If the floor strata is dense thick mudstone, the rock burst will happen for the elastic deformation energy released in the process of floor layer broken. The essence of deep hole floor-break blasting is the combination of borehole pressure relief and blasting vibration method for rock burst prevention. When the position of blasting holes in the middle of the floor and roadway centre line, not only the high elastic deformation energy accumulated in the floor can be released and the ability of continuously transfer stress/ energy be destroyed, but also the high stress in the roadway side can be released, which has made the prevention effect more apparent. © 2016, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.


Zhao S.-K.,China Coal Research Institute | Zhao S.-K.,Zhejiang University | Liu J.,Yima Coal Group Co. | Wei X.-Z.,Yima Coal Group Co. | And 3 more authors.
Journal of Coal Science and Engineering | Year: 2013

In order to analyze the mechanism of deep hole high pressure hydraulic fracturing, nonlinear dynamic theory, damage mechanics, elastic-plastic mechanics are used, and the law of crack propagation and stress transfer under two deep hole hydraulic fracturing in tectonic stress areas is studied using seepage-stress coupling models with RFPA simulation software. In addition, the effects of rock burst control are tested using multiple methods, either in the stress field or in the energy field. The research findings show that with two deep holes hydraulic fracturing in tectonic stress areas, the direction of the main crack propagation under shear-tensile stress is parallel to the greatest principal stress direction. High-pressure hydraulic fracturing water seepage can result in the destruction of the coal structure, while also weakening the physical and mechanical properties of coal and rock. Therefore the impact of high stress concentration in hazardous areas will level off, which has an effect on rock burst prevention and control in the region. © 2013 The Editorial Office of Journal of Coal Science and Engineering (China) and Springer-Verlag Berlin Heidelberg.


Song L.-S.,Henan Dayou Energy Co. | Zhao S.-K.,China Coal Research Institute | Liu J.,Yima Coal Group Co. | Wei X.-Z.,Yima Coal Group Co. | And 2 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2014

Rock burst tendency as a index for coal rockburst dangerous evaluation, it is sometimes under/over estimate the stability of coal and rock. The model of "roof-coal" structure body was built base on the coal seam hosting and the characteristics of rockburst behavior. With the rockburst tendency experiment of "roof-coal" structure body on coal, rock and two different height ratio and the numerical simulation test to research different roof strength, homogeneity, interface angle to the structure burst tendency. It is shown that the rockburst tendency index of "roof-coal" structure body higher than single coal or single rock and more closer to practice. With the strength, the height, the heterogeneity index of rock increasing, the rockburst liability of "roof-coal" structure body becomes stronger. The rock burst tendency index increase and the combined body whole strength decrease for the interface angle increasing, the post-peak plastic deformations is more obvious. When the interface angle in a certain, the accumulative AE energy decrease for the roof strength increasing. In addition, the rockburst tendency index more stronger, the accumulative AE energy of "roof-coal" structure body weaker during the phase of plastic deformation.


Dou L.-M.,China University of Mining and Technology | Cai W.,China University of Mining and Technology | Gong S.-Y.,China University of Mining and Technology | Han R.-J.,China University of Mining and Technology | And 2 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2014

On account of increasingly frequent rock burst hazards at present, the theoretical basis of rock burst determination through P-wave velocity was analyzed based on the experiment relation model of stress and P-wave velocity. Meanwhile, the technology of rock burst risk assessment was established through seismic computed tomography detection, which contains assessment parameters of wave velocity anomaly An and wave velocity gradient anomaly VG. The criterion of these parameters was documented. Finally, the assessment technology was verified by practical application. The results show that P-wave velocity reflects the strength criterion, energy criterion and dynamic load criterion for rock burst as for the rock mass with the same properties. The seismic computed tomography detection technology is feasible for rock burst risk assessment. It can give guidance on the implement of risk relief measures and check the effect of the measures.


Zhao S.-K.,China Coal Research Institute | Li H.-Y.,China Coal Research Institute | Liu J.,Yima Coal Group Co. | Han R.-J.,Yima Coal Group Co. | And 5 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2011

According to the mechanism of rock bursts occurred in deep complexity and severity, the mechanism and applicable condition predict measures for rock burst were analyzed, proposed to establish the multi-parameter prediction theory and successfully applied the impact of Yima Qianqiu Coal Mine, proposed some suggestions for rock burst prediction and prevention of deep mine.


Zhao S.,China Coal Research Institute | Ouyang Z.,China Coal Research Institute | Liu J.,Yima Coal Group Co. | Zhang G.,Yima Coal Group Co. | And 2 more authors.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2013

According to the analyzation of the process and influence factors of advanced deep hole blasting, its prevention and control mechanism for rock burst was demonstrated. The prevention effect was studied by changing the angle of blasting hole and the length of charge weight with ADINA numerical simulation software and its field practice effect was approved by different detecting methods from stress field and energy field. When the depth of the blast hole certain, the peak stress of high stress areas before workface reduce or transfer to deep coal at the three blasting hole arrangement in sector, which make the whole structure of coal-rock in a relatively stable low state. Furthermore, the angle of blasting hole larger and the length of charge longer, the shear stress decreasing zone bigger and the effect of rock burst control more obvious.


Hu W.,Henan Polytechnic University | Hu W.,Yi Ma Coal Group Co. | Tang J.,Henan Polytechnic University
International Journal of Automation and Computing | Year: 2016

A kind of adaptive sliding model control algorithm is developed to solve and improve the mathematical model dependency and un-modeled dynamics of a controlled system. The control strategy derived from a kind of data-driven control method in essence, thereby the input and output data are utilized by the controller with no information about the control system model. Theoretical analysis proves that this proposed control algorithm can improve the utilization of the estimated pseudo partial derivative information and accelerate the velocity of the convergence. The stability of the control system is further verified by rigorous mathematical analysis. This new discrete-time nonlinear systems model-free control algorithm obtained better control performance through the simulations for the linear motor position and the information tracking speed, which also achieved robust and accurate traceability. © 2015 Institute of Automation, Chinese Academy of Sciences and Springer-Verlag Berlin Heidelberg

Loading Yima Coal Group Co Ltd collaborators
Loading Yima Coal Group Co Ltd collaborators