Therefore the methane recovery rate can be improved.

In order to effectively use resources to enhance mine recovery rate,the paper studied down-dip strip mining method under the village,different plans were compared based on the actual situation.

Effective way of raising coal mining rate;

0 to the method of exploitation,under the surrounding rocks stable condition,the chamber extends 6m and pillars extends 6m is the optimal project and the mining rate is enhanced 12.

Based on the complexity of geological structure of coal fields and the growing exhaustion of coal resources in Fujian,this paper analyzes the characteristics of complex coal seams and the causes of low recovery ratio in coal resources.

To raise coal recovery ratio and solve the problems about full-seam mining in thick coal seam synthetically, presentsed a new full-seam mining method adopted the roadway layout of stagger arrangement without coal pillar according to theoretical study and mining practice.

Studied the law of the movement and the flow of the top-coal, the boundary curve of the caved coal and rock, and the recovery ratio and the refuse content for the different top-coal thickness, running coal distance, caved rock diameter by means of simulation experiment.

Based on the present method to calculate the recovery reserves and recovery coefficient of top coal caving mining, an error estimation model was derived.

The relevant problems such as the difficulty degree of coal mining, the rational recovery coefficient and compensation rate were investigated.

Analysis on coal mining rate of fully mechanized top coal caving mining in Kailuan Mining Area;

In order to improve the coal mining rate of the mine,according to the shallow mining depth,thick sand overburden,thin base rock seam and other mining condition features of Sanbula Mine,the paper analyzed the stressed and stability status of the different size coal pillars in No.