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Curvature reflects the size of bending degree of curve. In this paper, we put forward a new relational degree model based on curvature of the two series. The new model satisfies the parallel property and uniform property. It is consistent with the actual situation by comparison to the existing relational models. At the end, we give a case in order to validate the new model.
The working face of high mining have long length of mining and strike, so the area of goaf is large, often cause air return and local gas (especially the top corner) overrun, lead to the gas of working face overrun frequently and forced to shut down, even bring on significant pernicious accidents, cause casualties and great economic losses. This paper use the method of field testing and theoretical...
With the deep development of coal mining, the underground mining will face serious threats to the confined aquifer, mining under safe water pressure of aquifer has become the main way to mine deep coal resources. At the same time, the auxiliary waterproof method is particularly important to adapt to the mining. Faced with the mining technological challenges in the deep coal mining, with the analysis...
Through exposition on top coal caving mining method, as well as fully-mechanized top-coal mining method in the current development and prospect of China's largest coal enterprises, at the same time it can bring great benefits, also raised its recycling rate is still generally low phenomenon, effect analysis of the main reasons: at the end of the early mining losses, loss of head loss, caving technology...
For the actual implementation of fully-mechanized caving mining in thick coal seam in China, systems analysis of the influence factors of top coal capability, including natural geological factors and technology factors. Influence factors of top coal capability, constitute analysis of fully mechanized caving coal loss, thereby reducing loss of coal, improve mining rate of fully mechanized caving is...
The incidence of dynamic rock disasters is closely related to the distribution of stress in the surrounding rock. For the safety requirement of the construction and the operation of underground caverns, the stress of surrounding rock is monitored to evaluate the stability of underground caverns. The construction of spillway tunnel in Wawushan project was taken as our research object. We studied the...
Considering YuShenfu coal mining area, this paper uses the Gray correlation analysis method to analyze and select the 7 major factors which come from two aspects that are geological occurrence condition and coal mining design condition, on the basis of analyzing the formation mechanism of mining subsidence in the study area. And the five of seven which are disturbance coefficient, width-depth ratio,...
Based on the background of multi-rope friction hoisting transport system and the factual loading of hoisting skip as the object monitored, a practical and economic monitoring system scheme has been put forward, which is not only capable of monitoring the factual loading of hoisting skip but also can detect the quantity of unloaded coal left in hoisting skip after the process of unloading expediently,...
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