浅埋近距离煤层工作面末采阶段等压原理与应用

Isobaric Principle and Application of End-mining Stage in Shallow Buried Near-distance Coal Seam Working Face

为研究浅埋近距离煤层工作面末采阶段等压原理,以高家梁煤矿20314工作面末采阶段为工 程背景,首先利用关键层位置判别法确定2-2上煤层间距5 m处的细粒砂岩为亚关键层,间距32 m处的粗 粒砂岩为主关键层;通过覆岩岩层离层量Sn判断了上覆岩层破断层位,然后,分析工作面末采阶段不采取 停采等压和采取等压技术2种情况下工作面贯通后上覆岩运动规律,并通过理论计算确定工作面距回撤 通道6.6 m处为最佳停采等压位置,并在20314工作面末采阶段进行现场试验,回撤工作安全顺利完成。

In order to study the isobaric principle of the mining stage in the shallow buried near-distance coal seam,the mining stage of the 20314 working face in Gaojialiang Coal Mine is taken as the engineering background.Firstly,the key layer location discrimination method is used to detennine that the fine-grained sandstone at the interval of 5 m on the upper coal seam of 2-2 is a sub-key layer,and the coarse-grained sandstone at the interval of 32 m is the main key layer.The fault location of overlying strata was determined by layer separation Sn.Then,the overlying rock movement laws of the working face after passing through without stop-mining isobaric pressure or adopting isobaric pressure technology are analyzed.Through theoretical calculation,the 6.6 m from the working face to the retracement channel is determined to be the best isobaric position of stoping,and the field test is carried out at the end stage of 20314 working face,and the retracement work is completed safely and smoothly.