Jia R.,Shandong University of Science and Technology |
Jia R.,State Key Laboratory Breeding Base for Mining Disaster Prevention and Control |
Yan X.,Shandong University of Science and Technology |
Sun H.,Shandong University of Science and Technology |
And 3 more authors.
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2014
Rock burst situation assessment is one of the key and difficult issues in the safety monitoring and early warning field of coal mining. In this paper, based on real-time data from microseism, acoustic emission and electromagnetic radiation monitoring, situation assessment theory was introduced to the rock burst prediction, and a new situation assessment model of rock burst was established based on log audit of monitoring system and real-time correction algorithm. In addition, the situation quantitative method of rock burst was put forward by improving D-S evidence theory. Moreover, by using this method to calculate situation values in continual time points, the predictive values of rock burst situation were calculated and analyzed based on GM (1, 1) and ARMA models, respectively. Test results and related analysis show that the proposed situation prediction method of rock burst is reasonable and effective, and can reflect the development trend of rock burst dynamically.
Zhang X.-K.,University of Science and Technology Beijing |
Zhang X.-K.,Huozhou Coal Electricity Group Co. |
He F.-L.,China University of Mining and Technology |
Ma H.,LIAONING Technical University
Meitan Xuebao/Journal of the China Coal Society | Year: 2012
Based on the mine ventilation network calculation in this paper, all the mine ventilation system ambient temperature was real-time calculated and analyzed. First, different heat sources that effect the airflow temperature were classified and the basic calculation formula of heat sources was determined; second, according to compartmentalization of various types of roadway, different quality of the roadways was analyzed; finally, combined with the actual conditions of coal mines, ventilation system airflow and temperature parameters were calculated. These achievements can provid theoretical basis and reference value not only for the system's exploitation, reconstruction and development, but also for the design of ventilation system.
Qi Y.,China University of Mining and Technology |
Li M.,Huozhou Coal Electricity Group Co. |
Xu J.,China University of Mining and Technology
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2016
In order to avoid lacking of awareness and usage of the process of water inrush, drainage test of mining water inrush on site were studied under complex geological condition on the base of a comprehensive analysis of the background field near the water inrush point and risk assessments. Results show that the process of mine inrush water under certain conditions can be successfully used as drainage test, and some following roles can be gained such as determining the water source, revealing hydrodynamic process, calculating hydrogeological parameters, and revealing the Karst medium conditions and reasons for water inrush, and so on. The new method has been carried out to get access to hydrogeological information which was difficult to get using routine methods, providing important scientific data for analyzing water inrush reasons, and dealing with efficiently water inrush disaster. © 2016, China University of Mining and Technology. All right reserved.
Li S.J.,China University of Mining and Technology |
Li S.J.,Huozhou Coal Electricity Group Co. |
Wu Q.,China University of Mining and Technology |
Cui F.P.,China University of Mining and Technology |
And 2 more authors.
Applied Mechanics and Materials | Year: 2014
In China, water disaster often occurred in coal mines in recent years. According to official statistics on coal mine water accidents occurred in recent twelve years in China, major characteristics of the water disaster have been illustrated. The result shows that the number of both water accidents and corresponding fatalities decreased from 2001 to 2012. And apparently, the accidents occurred in township-owned coal mines and triggered by gob area water accounted for a higher proportion, respectively. © (2014) Trans Tech Publications, Switzerland.
Wang L.,China University of Mining and Technology |
Lu Y.,China University of Mining and Technology |
Yang X.,Huozhou Coal electricity Group Co. |
Gao F.,China University of Mining and Technology |
And 3 more authors.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2010
In-situ stress is formed in rock mass with complex origin and experienced a prolonged geological period, and there are many influencing factors. And in-situ stress is one of the important influencing factors to the deep laneway rock stability in coal mines. The field measurement is systematically carried out by boring stress-relief method with hollow inclusion triaxial strain gauge in primary mineable coal bed of Huozhou mining area and actual survey ground stress data at different positions and depths are achieved. Distribution law of in-situ stress field is obtained by systematically analyzing testing data. It shows that crust of earth in Huozhou mining area is effected by horizontal tectonic stress field. By using FLAC3D program, the model is established to analyze the laneway stability of different orientations based on in-situ stresses and detailed engineering geological condition. Using obtained research results and the maximum horizontal stress theory to study working area of Tuanbai coal mine No.8, the coal roadway roof stability performance is mostly effected by the maximum horizontal stress. The result is helpful to determine mining stope tendency and to choose the calculation parameters of coal roadway supporting design strength. The conclusion has important significance for the safety and high effective product in coal mines.
Li G.-B.,China University of Mining and Technology |
Li G.-B.,Huozhou Coal Electricity Group Co.
Meitan Xuebao/Journal of the China Coal Society | Year: 2011
Based on analysing the relation between the nut torsion moment and rock bolt pretension, the influence of the thread rolling accuracy upon the pretension was investigated. Factors influencing the thread rolling efficiency, i. e., rock bolt material quality, rolling technology and equipments, were examined. To study the relationship between torque and pretension, a laboratory table was specially designed and a series of tests were carried out on the rock bolts with different thread accuracy. The result indicates that the higher the thread rolling accuracy, the higher the coefficient of torque-to-pretension conversion. And the coefficient can be improved by daubing lubrication oil on the thread. In China, the rock bolt thread encounters the issue of low rolling accuracy which results in coarse thread surface. As a result, the efficiency of the torque-to-pretension conversion is greatly reduced. In addition, the rock bolt is susceptible to break at the thread end. Essential approach to resolve these issues is to significantly improve the thread rolling accuracy by adopting advanced equipment.
Li S.-J.,China University of Mining and Technology |
Li S.-J.,Huozhou Coal Electricity Group Co. |
Wang L.-G.,China University of Mining and Technology |
Lu Y.-L.,China University of Mining and Technology |
Zhang B.,China University of Mining and Technology
Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology | Year: 2011
Continuum mechanics were used with seepage theory to obtain a basic equation for slurry diffusion within cracked wall rock. The permeability tensor method was used to obtain the diffusion behavior. A mathematical model of slurry diffusion in a bolt grouting system within a wall rock having orthogonal fractures was developed. Certain assumptions and simplifications of field grouting and support methods were used during this derivation. A numerical simulation of the bolt grouting process was conducted using COMSOL. The slurry diffusion at different grouting pressures and for different bolt layouts were studied. The results show that a rational grouting pressure is from 1.0 to 4.0 MPa for roadway bolt supports. The borehole spacing should be nearly 1.3 times the slurry diffusion radius. These results were applied to the design of roadway supports in the Qinan coal of the Huaibei mine to good effect.
Li S.-J.,Huozhou Coal Electricity Group Co. |
Wang L.-G.,State Key Laboratory for Geomechanics and Deep Underground Engineering |
Lu Y.-L.,State Key Laboratory for Geomechanics and Deep Underground Engineering
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2011
In order to research the effect of rock joints and fractures distribution on wall rock stability, we establish the strike-dip, the size and density models of the structural surfaces of the broken rock mass by taking the roadway with broken rock mass as the study object. Then, using the Monte-Carlo random simulation method, we establish the 2-D structural surfaces network model to describe and characterize the broken rock mass and the information of the fracture. On this basis, we establish the discrete element numerical model of the roadway with broken rock mass and analyze the stress state, plastic zone distribution, and deformation features of the block and broken rock mass. The results show that 1) the size and the scale of the rock mass structural surfaces have a significant effect on the wall rock stress, 2) the carrying capacity of the broken wall rock is obviously lower than that of the block wall rock and the deformation of the broken rock mass is not the essential attribute of the rock mass materials but is a structure effect of the broken blocks.
Han L.,Anhui University of Science and Technology |
Han L.,Huozhou Coal Electricity Group Co. |
Meng X.-R.,Anhui University of Science and Technology |
Cao H.-J.,Huozhou Coal Electricity Group Co.
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2013
In order to study the truss-cable combination support mechanism in the large mining height and complex roof open-off cut, adopting theoretical analysis, field measurement, numerical simulation test method, the truss-cable support parameters in the open-off cut of large mining height 2-1101 working face were optimized. The results show that if the inclination of anchor cable is too large or too small, these are not conducive to control the deformation and plastic zone of the surrounding rock. The anchor cable inclination angle of 65°~75° is the best for truss-cable support; anchor points in the truss system must be anchored into a stable rock pressured to ensure that the truss system has a stable anchoring basis point. Truss-cable drilling depth is chosen as 9 m to enhance the stability of the roadway. The reasonable distance value of the cable drilling to roadway side is 1.5 m. It is better to control the development of the surrounding rock plastic zone when the roof bolt density is 10 in each row. The results of field measurement show that the convergence rate of roadway section is very small. The largest value of the open-off cut two sides moving closer is 145 mm. The roof subsidence maximum is 166 mm; truss-anchor-combined support has a good effect on the controlling of surrounding rock in the open-off cut.