摘要：
This paper mainly focuses on how to improve exploitation rate of coal bed methane (CBM) was presented in the paper. To enhance efficiency of exploitation of coal bed methane, the carbon dioxide or nitrogen gases were injected in the coal bed in the experiments. The injection of nitrogen gases in the coal bed could help increase the methane permeability. As a result, it showed that the injection of nitrogen gases could increase the stability and productivity of CBM.
关键词：
Mine tunnel ventilation;Numerical simulation velocity field;Temperature field
摘要：
Based on the characteristics of the mine tunnel and turbulence equation, the mathematical model of the mine tunnel of the ventilation flow is set up .Using the software simulates and analyzes the distribution of the velocity field of airflow and temperature field under different wind speeds in the mine tunnel. The result shows that the inlet airflow at the speed 4.5m/s is more stable and lower temperature to improve the working environment on the roadway.
作者机构：
[朱宏平; 董莪; 李炜明] School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan 430023, China;[李炜明] Changsha University of Science and Technology, Changsha 410004, China;[李炜明] School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China
通讯机构：
School of Civil Engineering and Architecture, Wuhan Polytechnic University, China
摘要：
Since coal gangue can destroy the environment, we aim at improving coal gangue to absorbing material by changing it in different temperature and chemical liquor. Base on the microstructure and the adsorption experiment, we detect microstructure and absorption property of improved coal gangue. The microstructure experiment shows that the average pore size and specific surface area of improved coal gangue appear distinguish obviously as the increasing of chemical liquor pH value and temperature. Absorption experiment shows that the absorption capacity of improved coal gangue decrease as the chemical liquor pH value increase, increase as the temperature increase. The adsorption capacity of improved coal gangue increases with an increase of average pore size and specific surface area.
摘要：
With the development of science and technology, many new materials and new technology are applied to the dike anti-seepage project. The practical methods of foundation vertical anti-seepage technology include vertically paving plastic film technique, directional jet grouting method and cement soil cutoff wall technology. The concepts of cement soil cutoff wall and the anti-seepage project's task and principle were introduced is this paper. According to the geological conditions of the Lower Yangtze region, the application of cement soil cutoff wall technology to the embankment of the Lower Yangtze region were analyzed, and the influence of the cut-off wall's permeability to seepage control effect was studied. It is concluded that the appropriate design of cut-off wall is permeability in an order of magnitude of 10-6 cm/s and the thickness is not less than 0.2m. The research results are helpful to the construction and design of dike anti-seepage project in future.
摘要：
Mining activity causes a large quantity of solid waste on the surface of mining area. The pollution of groundwater, which is caused by coal gangue in the process of rainfall leaching, becomes more and more serious. The present study analyzed the main chemical components of coal gangue through laboratory experiment, and the microelement mathematical model was established based on the theory of porous medium fluid mechanics and solute transport kinetics, this model described the movement pattern of the microelements in the groundwater environment system. Taking element Pb as an example, its concentration distribution in groundwater is predicted for the next 20 years by numerical simulation with Finite Element Method., The results showed that, As the time passed, the microelements pollution range expanded. The microelements is strongly blocked by interception effect though the cohesive soil. This result have both theoretical and practical significance and for effectively resolving environmental problems caused by the coal gangue solid waste in the mining area.
