Yanzhou Coal Mining Co.

Zoucheng, China

Yanzhou Coal Mining Co.

Zoucheng, China

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Zhu S.,China University of Mining and Technology | Cao D.,Yanzhou Coal Mining Co Ltd | Zhou H.,Zhengzhou Coal Group Co Ltd | Yang C.,Zhengzhou Coal Group Co Ltd | Liu J.,Yanzhou Coal Mining Co Ltd
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2014

In order to study the relationship between lithology and its composite structure and deformation and failure depth, based on these comprehensive field test data, restricting function of deformation and failure depth to mining coal seam floor by lithology and its composite structure is discussed. The obvious difference characteristics are obtained on homogeneous floor and soft and hard rock composite structure floor. The study results show as follows: 1) The law of deformation and failure of homogeneous floor is relatively simple; the depth of deformation and failure of mining floor is controlled by the strength of floor, and has a gradual characteristics from strong to weak below floor on the whole;2) The deformation and failure floor of soft and hard rock composite structure is complex. There is an obvious restrictive function to the depth of failure floor and deformation degree by the composite structure, weak intercalation being the main weak surface which has strong constraint effect to the depth of failure floor. Namely, soft rock plays an important the effect of the cushion for overlying hard rock, and can produce stress diffusion effect for underlying hard rock. The results show that the floor of lithology and its composite structure has an important restrictive function on the deformation and failure of mining floor depth, and also has theoretical and practical significance to supporting tunnel and preventing water-inrush from mining floor.


Wu X.-Q.,China University of Mining and Technology | Wu X.-Q.,Yanzhou Coal Mining Co. | Dou L.-M.,China University of Mining and Technology | Lv C.-G.,China University of Mining and Technology | And 2 more authors.
Procedia Engineering | Year: 2011

Based on the mining and geological conditions in No.12 Mining District of Jining No.3 Coal Mine, the variation laws of stress and deformation of the lower-protected seam along with the mining operation of upper-protective seam are studied by numerical simulation and field test in this paper. The results show that the distribution of in situ stress in protected seam is changed correspondingly during the protective seam mining. While mining the protected seam, the vertical stresses around the protected seam experienced three stages: stress increasing before mining, decreasing after mining and stepwise steady stage. In addition, the protective seam mining can also cause expansive deformation in protected seam and its surrounding rock, destroy the strata structure and release the elastic energy in advance, thus reducing the rock burst risk in protected seam. The results of numerical analysis and the field monitoring results are basically in agreement. The study in this paper will provide theoretical basis and practical value for reasonable design and safety mining of coal seams with rock burst propensity. © 2011 Published by Elsevier Ltd.


Zhou Y.-J.,China University of Mining and Technology | Zhou Y.-J.,Jiangsu Jianzhu Institute | Chen Y.,China University of Mining and Technology | Chen Y.,Yanzhou Coal Mining Co. | And 2 more authors.
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2012

In this paper, to evaluate the goaf backfilling effectiveness with solid wastes, the final compression ratio of backfilling materials was proposed as the technical measurement index, and the associated key affected factors were also analyzed. The results show that the three key affected factors of compression ratio include the roof subsidence before backfilling, the gap between the backfilling body and roof, and the compression amount of filling materials. Hereby, to improve the final compression ratio of backfilling materials obviously, the structures and the parameters of filling equipment were optimized, the filling technology was upgraded, and the supervisory control system of compression ratio was also established. The above achievements have been successfully applied in No.12 mine of Pingdingshan coal group. The application results show that the actual final compression ratio of backfilling materials in the goaf is up to 89.4% and the maximum surface subsidence is merely 15 mm, thus ensuring the safety of surface buildings.


Zhu S.,China University of Mining and Technology | Liu R.,Yanzhou Coal Mining Co. | Zhang S.,Chengjiao Coal Mine Henan Zhenglong Coal Industry Co. | Hu D.,Yanzhou Coal Mining Co.
Geotechnical Testing Journal | Year: 2016

This paper dealt with the deformation and failure characteristics of a mining-affected deep coal seam floor by selecting the fully mechanized coal-mining face of the coal mine in the east of Jining City, Shandong Province, China. We numerically simulated and experimentally tested the variation laws of the strain increment with the mining face advancing and the distribution characteristics of the floor’s plastic zone at different depths. The results showed that (1) the failure depth of the mining-troubled floor was between 18 and 20m and the degree of floor failure would further aggravate with face advancing and floor unloading, and (2) the impact of mining pressure on the coal seam floor showed obvious leading and lagging characteristics, and thus its impact region in the coal seam floor could be divided into the elastic and violent disturbance regions. In addition, we numerically simulated and analyzed the mechanism of deformation and failure of the mining floor and showed that simulated results were consistent with the in situ measured results. This study not only provided important information on the roadway supporting of fully mechanized mining tunnels for the prevention of rock bursts, but also provided an important reference value for coal mines with similar geological conditions. Copyright by ASTM Int'l all rights reserved.


Wu Q.,China University of Mining and Technology | Jia X.,China University of Mining and Technology | Cao D.-T.,Yanzhou Coal Mining Co. | Liang Y.-P.,Chinese Academy of Geological Sciences
Meitan Xuebao/Journal of the China Coal Society | Year: 2014

With the gradual increase in mining depth and the lower coal seam group mining in North China coalfield, the problems of water inrush into coal mine from the Ordovician carbonatite aquifer underlying the coal seam group and the goaf water flow pollution to the Ordovician carbonatite aquifer are growing seriously. According to systematic statistics and analysis of a large number of geological exploration data in the central coalfield of Yanzhou Shandong Province, author carried out a comprehensive study of the ancient weathering crust impermeability from the weathering crust thickness, drilling core recovery rate, drilling fluid consumption, weathering fracture development and filling degree, geological tectonic development and other aspects of the Middle Ordovician limestone, and established the indicator system to characterize its impermeability, and applied the powerful data management and spatial analysis functions of GIS and information fusion technology to create a GIS-oriented information fusion impermeability evaluation method-aquifuge index method, and put forward technology roadmap and specific work procedures of the aquifuge index method, and has applied the method to a real project.


Huang Z.,China University of Mining and Technology | Jiang Z.,China University of Mining and Technology | Cao D.,Yanzhou Coal Mining Co. | Li T.,Yanzhou Coal Mining Co.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2014

Water injection test is a particularly useful technique to determine the impermeability of rock stratum. Based on Baodian coal mine, the data of water injection test were obtained and permeability coefficient of floor rock were deduced through high pressure water injection test. Based on the analysis of data, the results show that the curves of permeability coefficient and pressure are provided with a significant segmentation, which is stable before fracturing pressure and shows linear relationship with high regression coefficient after fracturing pressure. The relationship between permeability coefficient and water discharge is close to linear. Results show that if water discharge continue to rise, the permeability coefficient tends to increase; the impermeability of floor rock stratum can be judged by the calculated results of the critical impermeability strength. The result of the impermeability from highest to lowest is mudstone, siltstone, fine sandstone, limestone. The results make a important reference for safety-mining of follow-up working face. ©, 2014, Academia Sinica. All right reserved.


Liang D.-X.,China University of Mining and Technology | Jiang Z.-Q.,China University of Mining and Technology | Guan Y.-Z.,Yanzhou Coal Mining Co. Ltd
Mine Water and the Environment | Year: 2015

Seam floor water-inrush accidents in mine stopes are often associated with fault structures in which water pressure resistance capacities are less than that of the intact seam floor. A new in situ water resistance capacity test was recently developed and used to determine the water resistance properties of a section of a normal fault. The in situ tests defined initial seepage conditions, the state of seepage after flow stabilized, and the measure and calculation of water resistance capability. The test results were used to calculate the unit seepage failure resistance strength, a quantification of the water pressure resistance capacity. It appears that such tests can be used to better evaluate the safety of coal extraction, and whether coal seams under inferred threat from water inrushes can be excavated safely without dewatering or depressurizing the underlying confined aquifers. © 2014, Springer-Verlag Berlin Heidelberg.


Huang Z.,China University of Mining and Technology | Jiang Z.-Q.,China University of Mining and Technology | Qian Z.-W.,China University of Mining and Technology | CAO D.-T.,Yanzhou Coal Mining Co.
Acta Geodynamica et Geomaterialia | Year: 2014

Coal mine water inrush has an impartible relationship with the fracture zone such as faults, which deeply threaten the safety production in China. In order to study the water seepage behavior in the fault and the impermeability of the fault when water inrush through fault occurs, some water inrush cases through faults were analyzed, and water injection tests which drilled one injection borehole and one observation borehole into the fault zone were carried out at one coal mine. The breakdown pressure, reopening pressure, as well as the initial water seepage pressure, impermeability and the initial hydraulic conductivity of Puzizhier fault, were obtained from the result of the water injection tests. The study shows that water seepage in faults goes through three stages which consist of pore flow, fracture flow and pipe flow. It shows a process of the fine particulates and existing in-fill in the fault zone washing out and original and newborn cracks expanding and connecting. The results of water injection tests can be thought to show the fault healing effect under the underground pressure. In addition, the risk of water inrush through faults owes a great deal to the characteristic of water source. © 2014 Academy of Sciences of the Czech Republic. All Rights reserved.


Shuyun Z.,China University of Mining and Technology | Zhenquan J.,China University of Mining and Technology | Dingtao C.,Yanzhou Coal Mining Co. | Qiang S.,China University of Mining and Technology | Chaowei Y.,Zhengzhou Coal Group Co.
Natural Hazards | Year: 2013

In order to research the relationship between deformation and failure depth and lithology and its composite structure, in situ test data on the deformation and structure variation of rocks in different depth of the coal seam floor were utilized on Xinglongzhuang Coal Mine and Baodian Coal Mine in Yanzhou Mining Area by strain testing system and ultrasonic imaging technology in the fully mechanized top-coal working face, and the data on the East Main Haulage of -300 m lever in Peigou Coal Mine in Zhengzhou Mining Area in China were also used. There are obviously different deformation and failure characteristics of similarly homogeneous floor and soft-hard composite structure rocks floor under the mining pressure, which are based on the in situ test data. The research shows that the law of deformation and failure of similarly homogeneous floor is relatively simple; the deformation and failure depth are restricted by the strength of floor rock and has a gradual variation from top to bottom. But the deformation and failure of the interbedded soft-hard rock mining floor are more complex; this kind of structure has a obviously restricting function on the failure depth and deformation degree of the mining floor, and the weak intercalation has a strong constraint effect to the depth of floor failure which implies that the soft rocks have a "cushion effect" on the overlying hard rocks and a "stress diffusion effect" on the underlying hard rocks. © 2013 Springer Science+Business Media Dordrecht.


Yan X.-L.,LIAONING Technical University | Chen X.-H.,LIAONING Technical University | Yan X.-Y.,Yanzhou Coal Mining Co.
Meitan Xuebao/Journal of the China Coal Society | Year: 2011

In order to effectively prevent the pressure bumping accidence occurred when fully-mechanized coalface passed through fault, the SOS microseism monitoring and measuring system was applied to the full time monitoring and measuring on the microseismic activities in the coal and rock mass of the fault area. Based on the variation features of the energy releasing and vibration frequency in the microseismic activities, analyzed active accumulated energy of the fault block affected to the pressure bumping occurred and analyzed the variation law of the microseismic activity influenced by the human mining and excavation in the fault area. The results show that the microseismic activity in the fault tectonic area has a high instability. With the fully-mechanized coalface pass through the fault, the daily seismic release total energy value in the fault area will be steadily increase. The max energy peak will be a tendency to be rapidly increased. Before the strong microseismic activity occurre, there will be a weak seismic activity period and the weak seismic activity will play an energy accumulation role to have a strong seismic to be occurred.

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