关键词: 沿空留巷, 矿压显现规律, 液压支架工作阻力, 二次采动

Abstract: Mining pressure monitoring is carried out in gob-side entry retaining of Zhongxing Mine. Strata-pressure behaviors of working face and deformation laws of roadway which be in the secondary mining are studied by analyzing working resistance's changes of hydraulic supports and deformations of roadway. The results show that: The maximum dynamic load coefficient of working face, which reaches 1.757, occurs in the area close to the roadway which be in the secondary mining. So, the strata behaviors is most obvious in this area. Two ends of working face have longer periodic weighting length and duration, the duration can be 2.4~2.6 times longer that in middle of working face. Therefore, the two ends of working face are major locations where periodic weighting affects. When height of partial working face increases duo to the existence of extraction roadway, periodic weighting becomes not obvious, and this part always be in high roof pressure, so it is the key region of roof management. The deformation of side wall is 2.28~3.38 times which of the roof in the roadway, so the supports of side walls need to be pay more attention. In the roadway, when distance between working face and monitoring section is less than 10m, mining pressure affects strongly, when the distance is between 10m to 50m, mining pressure begins to influence, and when the distance is more than 50m, mining pressure has little influence.

Key words: gob-side entry retaining, strata-pressure behaviors, working resistance of hydraulic supports, the secondary mining, deformation of roadway