Tongshan, China
Tongshan, China

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Xu Z.-M.,China University of Mining and Technology | Gao S.,China University of Mining and Technology | Cui S.-Y.,China University of Mining and Technology | Sun Y.-J.,China University of Mining and Technology | And 2 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2017

The ecological environment is relatively weak due to the low precipitation and high evaporation. The study area is the Dananhu mining area of Hami coal field, which is located in the Turpan-Hami basin. For the ecologically vulnerable area, the authors studied the hydro-geological conditions for water-preserved mining and its feasibility. The structure of aquiclude in the roof of major coal seam has been systematically assessed. Furthermore, the authors investigated the development characteristics of the height of the water flowing fractured zone, and studied the development potential of aquifer under protection. Then, the practical application for water-preserved mining had successfully conducted at the 1801 working face of Dananhu No. 5 Coalmine as a case study. This study proposed a preliminary program for the development and utilization of protecting high salinity aquifer water, gaining experience for water-preserved mining in the ecologically vulnerable area of the Turpan-Hami Basin. This paper first put forward and practiced the roof water disaster control and water-preserved mining combining engineering in the typical ecological fragile area of Tuha Basin, providing theoretical and practical references for safely exploit the coal resources in Turpan-Hami coal field, which is one of the four major coal bases in Xinjiang Province. © 2017, Editorial Office of Journal of China Coal Society. All right reserved.


Wang J.,China University of Mining and Technology | Wang J.,State Key Laboratory of Coal Resources and Safe Mining | Wang J.,Key Laboratory of Deep Coal Resource Mining | Wang Z.,China University of Mining and Technology | And 6 more authors.
International Journal of Thermal Sciences | Year: 2017

In order to study the distribution characteristics and related parameters of the temperature field in underground coal gasification stope, Laplace transform and inverse Laplace transform were used to determine the analytical solution to temperature propagation in the stope under type one boundary conditions. Additionally, Mathematic software was used to conduct numerical simulation. Results indicate that in an unsteady stage, the temperature field gradually propagated in the coal seam, and that the propagation rate became steady after a gradual increase. The time required for the temperature field in the coal seam undergoing gasification to transform from the unsteady to the steady state was inversely proportional to the advance rate of the flame working face. During the stages of temperature increase and decrease, the temperature field in the roof, floor, and surrounding coal seam gradually moved towards the interior. During the temperature increase stage, the peak of the temperature field occurred on the surface of the surrounding rock and gradually increased; it also moved inward from the surface and gradually decreased during the temperature decrease stage. The temperature decrease stage had greater influence on the temperature field in the roof, floor, and surrounding seam than the temperature increase stage. The influence of the temperature increase stage was related to the advance rate of the flame working face; this influence is negligible when the advance rate of the flame working face exceeded a threshold value. Finally, based on the features of the envelope curves of temperature curve families, the ranges of the surrounding coal seam with no load-bearing capacity and coking cycle were obtained, as were after determination of their respective criteria and temperature threshold values. © 2016 Elsevier Masson SAS


Zeng W.,China University of Mining and Technology | Ma J.,China University of Mining and Technology | Wen K.,China University of Mining and Technology | Zhu K.,China University of Mining and Technology | And 2 more authors.
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2016

The theoretical calculation and application based on the Mindlin's Stress Equations have been widely used in Piled raft foundation, soil nailing wall, rock bolt foundation, etc., while rarely used in rectifying the tower, which has rigid connection with the shaft. Stress relief method has been successfully used in rectifying building but none in rectifying shaft tower. Numerical simulation and the Mindlin's equations have both been utilized to verify that the stress relief method is effective in rectifying shaft tower. The results of Mindlin's equations have been revised by considering the unloading ratio of the excavation, and they are in great accordance with the numerical simulation results. Both of them have shown that stress relief method can be successfully used in shaft tower rectification; and that increasing the width of the stress relief area, shortening the distance between stress relief hole and shaft tower, deepening the stress relief hole and increasing the diameter of the stress relief hole can effectively enhance the rectifying performance. © 2016, China University of Mining and Technology. All right reserved.


Zhang Z.-Z.,China University of Mining and Technology | Gao F.,China University of Mining and Technology | Gao Y.-N.,China University of Mining and Technology | Yan B.,Xuzhou Coal Mining Group
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2010

In order to study the differences of engineering behavior in large section open-off cut in different construction orders, the mining process of two common orders was simulated by using the software ANSYS. The result data through relevant analysis shows that the stress distribution of surrounding rock presents the shape of butterflies, and it expands toward top left corner and top right corner, which is the possible bumping center. 37 points were selected respectively on two sides of the open-off cut and rock roof, and the change law of equivalent stress at those points in different construction orders was obtained. On the basis of this, the bumping risk of two-sides and rock roof was analyzed, showing that the bumping risk is the worst on right hand of open-off cut in project "first-lead-then-larger". Generalized strain energy density was brought forward and defined, and a simple bumping rule used in given engineering was set up based on the relationship between the change of generalized strain energy density and bumping risk in cutting process.


Jin-Long J.,China University of Mining and Technology | Li-Wen C.,China University of Mining and Technology | Hong-Wei L.,Xuzhou Coal Mining Group | Hai-Yang C.,Xuzhou Coal Mining Group | Chang-Sheng Z.,Xuzhou Coal Mining Group
Electronic Journal of Geotechnical Engineering | Year: 2014

Aiming at the poor stability of large section soft and broken roof of coal roadway, we apply limit equilibrium theory as basis for supporting design. Combing theoretical analysis and field measurement determine the limit equilibrium zone of surrounding rock in coal roadway with large section. Based on the scope of limit equilibrium zone, anchor bolt and anchor cable parameters in supporting system are designed to control the stability of surrounding rock. Monitoring the roadway surrounding rock deformation during roadway drivage and working face mining period, and analyses the deformation law. The results show that surrounding rock deformation remain stable from drivage face 50m, and maximum deformation is 80mm; The surrounding rock deformation and deformation velocity is bigger in front of working face 30m, the maximum value are 11mm and 25mm/d, respectively, affected by the mining influence. The deformation meets requirements of the stability of surrounding rock. The supporting design method can improve the overall stability effectively, and ensure the safe and efficient mining. © 2014, ejge.


Xin L.,China University of Mining and Technology | Xin L.,Key Laboratory of Deep Coal Resource Mining | Wang Z.,China University of Mining and Technology | Wang Z.,Key Laboratory of Deep Coal Resource Mining | And 8 more authors.
International Journal of Mining Science and Technology | Year: 2014

In order to study temperature field distribution in burnt surrounding rock and to determine ranges of burnt surrounding rock, coal-wall coking cycle and heat influence in the underground coal gasification (UCG) stope, based on the Laplace transform and inversion formula, we studied the temperature analytical solution of one-dimensional unsteady heat conduction for multi-layer overlying strata under the first and the forth kinds of boundary conditions, and we also carried out a numerical simulation of two-dimensional unsteady heat conduction by the COMSOL multiphysics. The results show that when the boundary temperature of surrounding rock has a linear decrease because of a directional movement of heat source in the UCG flame working face, the temperature in surrounding rock increases first and then decreases with time, the peak of temperature curve decreases gradually and its position moves inside surrounding rock from the boundary. In the surrounding rock of UCG stope, there is an envelope curve of temperature curve clusters. We analyzed the influence of thermophysical parameters on envelope curves and put forward to take envelope curve as the calculation basis for ranges of burnt surrounding rock, coal-wall coking cycle and heat influence. Finally, the concrete numerical values are given by determining those judgement standards and temperature thresholds, which basically tally with the field geophysical prospecting results. © 2014 Published by Elsevier B.V. on behalf of China University of Mining and Technology.


Duan T.,China University of Mining and Technology | Duan T.,Key Laboratory of Deep Coal Resource Mining | Wang Z.,China University of Mining and Technology | Wang Z.,Key Laboratory of Deep Coal Resource Mining | And 13 more authors.
Energy Education Science and Technology Part A: Energy Science and Research | Year: 2012

Enhancement of efficiency of UCG (underground coal gasification) means reduction of CO2 Emission and improvement of environment. With the practical experience in the UCG power generation field trial in Huating Coal Group of China, six ways of enhancement of efficiency of UCG are put forward which include selecting proper gasification agent flow rate, proper steam and O2 concentration in gasification agent, appropriate oxygen making process and controlling the length of the reduction zone. The enhancement of efficiency of UCG is systemic engineering. All of the ways can be adopted under the conditions of the existing technologies. © Sila Science. All rights reserved.


Duan T.,China University of Mining and Technology | Duan T.,Key Laboratory of Deep Coal Resource Mining | Wang Z.,China University of Mining and Technology | Wang Z.,Key Laboratory of Deep Coal Resource Mining | And 10 more authors.
Energy Education Science and Technology Part A: Energy Science and Research | Year: 2012

Integrated calculation method and calculation method of actual measurement method were merely applied for calculating air gas or gas producing with two-stage method and not suit for simulating gasification processes of air-steam method, oxygen-enriched air steam and pure oxygen steam method. Papers of how calculation method of reaction equilibrium been employed in underground coal gasification (UCG) has not been found. In order to guide the design of UCG, the reaction equilibrium model was established to simulate air-steam continuous method, oxygen-enriched air steam continuous method and pure oxygen steam continuous method of UCG. Meanwhile, corresponding three matlab programs was programmed. And it is proven that simulation results coincide with the actual field test data to a great extent. Besides, the rule of simulated UCG index changing along with steam-oxygen ratio is in accordance with lab test results. These show that thermodynamic and chemical processes of UCG can be well simulated by the model and programs. © Sila Science.

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