Taking 5201 face, Wangzhuang coal mine as an example, the measures of preventing gas consistence exceeding normal value were put forward, that is, applying small section entry retaining along gob side and layout of J-shape ventilation system.

The mining technology by areas with retaining roadways along goaf is applied in Baishan Coal Mine.

The retaining roadways along goaf is applied in the left No.

Some aspects were analyzed,such as the function of support in retaining roadways along goaf,mine pressure behavior,support ways,the satisfied requirements,and the existing problems in maintenance.

Cause analysis on roof broken in mine gateway retained for next sublevel in Xinghua Mine as well as prevention and control;

Research on technology of gateway retained for next sublevel with anchor support;

In this paper,the characteristics of ground-pressure are studied at gob-side entry retained in Jixi Coal-mining Group Company.

The effect regularity of main roof rupture location,top-coal length uncaved at the end of working face,filling belt width, filling way,filling belt strength to surrounding rock stability around gob-side entry retained in top-coal caving mining face were analyzed.

By using numerical analyses software UDEC which is suitable for analyzing rock stratum rupture and collapse, the numerical models were set up to study the effect of support way, filling belt width, filling way, filling belt strength and top-coal length uncaved on the gob-side entry retained in top-coal caving mining face.

The Status-quo of Support Technology on gob-side entry retaining laneway and Existing Problem Discussion;

Numerical analogy study of support effect in gob-side entry retaining;

Filled body's stress of gob-side entry retaining control;