Roof control technology for large unsupported roof at face end of coal mining face;

Analysis and ascertainment of people's operation reliability at coal face;

The support power of the trend longwall coal face;

The gas density is higher at coal faces in the key-point area of gas management.

Application of a new pattern of hydraulic propeller in mining face;

It is widely used in the push of transporter of each type in mining face of coal mine underground.

This paper analyzes the regularity of the gas emission in mining face and its main influencing factors,and expounds the gas treatment and control technology.

Through analyzing Principal Component Analysis(PCA) and Gene Expression Programming(GEP),a novel GEP Algorithm based on PCA is proposed and applied to predict the amount of gas emitted from coalface.

The prediction of the amount of gas emitted from coalfaces is the basis of ventilation system design and safety measurement implementation.

Based on some typical examples of gas explosions on the coalface,the basic events resulting in gas explosions are generalized and a fault tree is drawn.

New method to determine dust concentration in coal mining face;

Aiming at problems of easy accumulation of gas at corners of coal mine face worked,develop fan which is proper to keep work under the particularity environment,add a new of method for controlling the accumulation of gas at corners of coal mining face worked,gained all right result in the coal enterprise application.

The paper also introduces the applications and expectation of modern manufacturing methods on coal mining face.

This article analyses the cause of roof falling down in mine working face, and puts forward 5 kind of improving methods.

The state of the whole mining system is changed with the working face advance or tunnel boring, as well as drag, rock pressure, gas concentration.