Abstract:The broken pattern of the overburden strata induced by mining has a non-ignorable effect on overlying strata movement, failure, and safety in mining production. To study the caving pattern of overlying strata and determine the calculation method of fracture pathway parameters due to roof caving induced by coal mining, the trapezoidal broken models were developed to explain and prevent water leakage, and even water inrush, during the mining process. By incorporating the variation of the volume expansion coefficient, a connection among the parameters of the fracture pathways and fracture angles, face width, and mining height could be established, which shows that the larger the degree of the fracture angle is, the smaller the value of the volume expansion coefficient and face width is with a relatively larger mining height. This relationship was also used to determine the eventual evolution configuration of the trapezoidal broken model. The presented approaches may help us to better understand the movement of overburden strata and provide an idea to help settle conflicts related to fracture space calculations induced by coal mining.
Large scale roof strata caving that occurs during coal extraction can irreversibly damage floor strata and result in riskier mining operations. Four research models incorporating floor water pressure were assessed for floor strata failure, using eight methods and two classification systems. A connection between floor strata failure and the coefficient of impact risk was developed. The derived equations represent a potentially effective method for providing a preliminary assessment of the risks associated with floor strata failure due to caving. A classification system of floor failure potential can be constructed to minimize risks during mining.
Abstract. According to guiding ideology of digital mine construction as well as the production and operating conditions of open-pit coal mine in China, this paper designs the multi-source data management system of digital mine for open-pit coal mine. 6 kinds of spatial data and 3 kinds of non-spatial data were managed through the system to achieve the purposes of data fusion and data mining. The data characteristics and storage structure were roundly introduced in this paper. GIS component development was used to design the system. The practical application shows that the system could improve the management efficiency of data in open-pit coal mine and visually and concretely present the mining area. In this way, the convenience and support for management and production of mining area could be brought.
Shale gas and coal-bed methane are very important unconventional resources. Shale gas and coal-bed methane are the most effective supplement of the conventional fossil energy, and the quantity of these resources are abundant. So the shale gas and coal-bed methane have been gained comprehensive attention all over the world. At present China has basically realize commercial production of coal-bed methane industry, but the shale gas is still in the experimental stage. This paper analyzes shale gas and coal-bed methane based on energy strategy level, energy utilization level, mining technology level and environment level. The weight of these factors was analyzed by using analytic hierarchy process (AHP). The results show that in China the coalbed methane should be the priority development, and then the shale gas. And put forward some suitable suggestion and comments, to ensure China's energy structure development orderly, healthy and rapidly. Introduction Shale gas is a kind of unconventional gas, which is in the shale bed or mudstone bed with free state or adsorbed state. Shale gas development was successful in industrial development Only in North America [1]. The shale gas is lower productivity, because the pressure of the shale gas is low, the saturation degree is low. Coalbed methane is also a kind of unconventional gas, which is stored in the coal seam, and the main ingredients are methane. The government has introduced many policies to encourage the development and utilization of coalbed methane, science 2007 [2,3]. Compare and analysis the shale gas and the coalbed methane in many level to determine the production value is very important for China to allocate capital resources and protect the resources and environment reasonably [4,5,6]. This paper analyzed shale gas and coalbed methane based on energy strategy level, energy utilization level, production technique level and environment problem level, and obtained the weight of these factors by using analytic hierarchy process (AHP) [7]. And put forward suitable suggestions and comments, to ensure the energy structure development orderly, healthy and rapidly in China.
According to the energy development policy and energy structure adjustment in China, this paper puts forward the utilization strategy of goafs based on correspondence analysis. Firstly, the correspondence analysis was used to discriminate the goafs with hidden collapse risk and research the collapse rules in coal mine. Using this method, 7 variables which affected the collapse of coal mine goaf and 24 samples were analyzed by R factor analysis and Q factor analysis to complete the distribution picture of variables and samples. The variables included degree of complex geological structure, goaf volume rate, vertical depth away from the surface, dip angle of coal seam, number of spatial superimposed layers, overburden thickness and overburden type. The analyses were conducted by the distribution picture to research the collapse rule of goafs. The corresponding measures could be taken to treat the goafs according to collapse rule. Secondly, the projects of establishing underground water storage system, underground oil and gas storage system and underground waste disposal system were proposed to realize the goafs utilization. Evaluation Methods of Goafs Collapse Rules Goaf collapse which seriously threats the life and property safety of the residents in mining areas belongs to the geological hazards caused by goafs. Determining the goafs with hidden collapse risk and figuring out the collapse rules have great significance for goafs management.
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