近距离厚煤层开采工作面矿压显现规律

Study on the strata behavior law of the mining face with close distance thick coal seams

为了获得神东矿区上湾煤矿12301工作面过上覆采空区及其留设煤柱时矿压显现规律,采用现场实测的方法,对近距离煤层下行开采工作面的矿压显现特征进行了研究。结果表明:工作面过上覆采空区的周期来压平均步距为12 m,支架动载系数平均为1.31;过集中煤柱的周期来压平均步距为8 m,支架动载系数平均为1.42。造成该现象的主要原因是,下煤层工作面的矿压显现受上覆关键层活动影响。过采空区时,顶板主关键层呈现出"稳定—失稳—稳定"的活动规律;过集中煤柱时,顶板亚关键层和煤柱呈现出"稳定—失稳—稳定"的活动规律。

In order to research the strata behavior law of lower coal mining face with close distance coal seams in No. 12301 working face which pass through upper goafs and coal pillars in Shangwan coal mine of Shendong mining area,the strata behavior law of lower coal mining face with close distance coal seams was studied by using the the oretical analysis and field measurement method. The results show that: the average distance of periodic weighting is 12 m and the average dynamic load coefficient of support is 1. 31 when coal mining face passes through upper goafs area. The average distance of periodic weighting is 8m and the average dynamic load coefficient of support is 1. 42 when coal mining face passes through upper concentration coal pillars area. The main reason for this phenomenon was caused by overlying key strata movement. When passing through upper goafs area,the major key strata of roof presented 'stability-instability-stability'activity patterns,but when passing through upper concentration coal pillars area,the key sub-strata of roof presented'stability-instability-stability'activity patterns.