Zhengzhou Coal Group Co Ltd

Xinmi, China

Zhengzhou Coal Group Co Ltd

Xinmi, 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.


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.


Zhu S.,China University of Mining and Technology | Jiang Z.,China University of Mining and Technology | Zhou K.,Zhengzhou Coal Group Co. | Peng G.,Zhengzhou Coal Group Co. | Yang C.,Zhengzhou Coal Group Co.
Bulletin of Engineering Geology and the Environment | Year: 2014

Deformation and failure of a “three-weak” (weak roof, thick weak coal, and weak floor) coal seam floor subject to mining are studied in this paper. Firstly, by using a group of strain sensors buried at different floor depths, we measured the relationships of the axial strain to the distance from the advancing face field. The floor depths and stratum positions, and as well as the peak width, which is the distance of the first maximum strain increment to the working face, were drawn. The axial stress and its zone of influence, which is the distance from the face to the borehole along the roadway, and at which there is obvious strain increment difference, were also drawn. Secondly, we established an analytical mechanical model and found the analytical solution of the floor’s supporting pressure distribution ahead of the face. And thirdly, we set up a numerical simulation engineering geological model and simulated stress distribution and deformation characteristics of the floor with complex multi-stratum (11 strata) structure. The results from the three approaches showed that: (1) the failure depth (<10.0 m) and zone of influence (up to 36.0 m) induced by mining ahead of the three-weak seam face were much smaller than those common seam faces; (2) the axial strain fluctuated greater than the radial one, with its max peak keeping at about 8.0 m ahead of the advancing face, and its zone of influence spreading to 36.0 m; (3) the peak width of axial strain and its zone of influence in the haulage roadway were stronger than those in the ventilation roadway; and (4) the three weak coal seam played a strong buffering action against deformation and failure due to mining. This research may be of interest to assist with improving strata control and health and safety in operating coal mines. © 2014, Springer-Verlag Berlin Heidelberg.


Zhang R.,China University of Mining and Technology | Jiang Z.,China University of Mining and Technology | Zhou H.,Zhengzhou Coal Group Co. | Yang C.,Zhengzhou Coal Group Co. | Xiao S.,Zhengzhou Coal Group Co.
Natural Hazards | Year: 2014

Groundwater outburst has an impartible relationship with geological structures such as water-conducting faults, which are widely distributed in north China. In order to study the seepage property and mechanism of water outburst from the faults above a confined aquifer in the coal mining, the simulation model of ground water inrush for fault was designed. The water outburst parameters, such as water inflow, permeability, seepage velocity, porosity and other variables under different material combination and water pressures, were obtained; the research results indicate as follows: (1) The changes of the water inflow can be divided into three stages, i.e., the water inflow slowly increases at the early stage, rapidly increases at the middle stage and keeps unchanged at the late stage. (2) The seepage process can be represented by the seepage combination types, which are composed of pore flow, fissure flow and pipe flow, and the seepage changes not only with time but also with different conditions. (3) Mining would lead to the reactivation of faults and further enhance the permeability of fault zone potentially. The tiny granules in fault would be eroded and moved to exterior as the time under the high water pressure and lead to the change of porosity parameters. In this case, the seepage velocity would increase ceaselessly, and then the seepage would convert into pipe flow and finally lead to water inrush accidents. © 2013 Springer Science+Business Media Dordrecht.


Zhu S.-Y.,China University of Mining and Technology | Zhou H.-Y.,Zhengzhou Coal Group Co. | Li X.-F.,Zhengzhou Coal Group Co. | Yang C.-W.,Zhengzhou Coal Group Co. | Sun Q.,China University of Mining and Technology
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2013

To research the deformation and failure mechanism of "three-soft" coal seams under blasting mining conditions in Zhengzhou mining area, by comprehensively using field measurement, theoretical analysis and numerical simulation, the deformation and failure depth and mechanism of mining floors in a typical coal face in Gaocheng Coal Mine were studied in this paper. The deformation and failure depth and stratum in the roadway floor of the "three-soft" coal seam, as well as the width and influence scope of peak stress ahead of the coal face were obtained by analyzing the monitoring data of strain sensors in boreholes at the haulage and ventilation roadways. On this basis, the engineering geological model for floor stress calculation was estab-lished, and the analytical solution of basic strain and the distribution law of deformation and stress in mining floor at different depths along with the face advancing were deduced and simulated by theoretical analysis and numerical simulation.

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