浅埋深不规则综放工作面矿压显现规律研究

Study on mine strata pressure behavior law of irregular fully-mechanized top coal caving mining face in seam with shallow depth

为了获得阳湾沟矿6204不规则工作面综放开采过程中的矿压显现、巷道变形及超前应力分布规律,通过采用多种监测、探测手段对不规则综放工作面展开矿压显现规律研究。研究结果表明:不规则工作面来压步距与开切眼长度有关,开切眼越长则来压步距越小,来压强度也越低,反之亦然;在工作面推进期间,回采巷道的变形较小,即使在初次来压和周期来压期间,巷道变形也无明显增加。同时,通过数据分析给出该工作面支承压力超前影响范围为5 m,超过5 m后工作面超前支承压力变化较小,地震波波速CT探测也表明距工作面0~20 m存在应力集中区。

In order to have the mine strata pressure behavior,mine gateway deformation and advance stress distribution law occurred in the fully mechanized top coal caving mining process of No. 6204 Abnormal Coal Mining Face in Yangwangou Mine,with several monitoring and measuring means and the detection means,a study of the mine strata pressure behavior law was conducted on the irregular fully mechanized top coal caving mining face. The study results showed that the roof weighting step distance of the irregular coal mining face was related to the length of the open-off cut. The longer of the open-off cut was,the shorter of roof weighting step distance would be and the roof weighting strength would be getting lower and vice versa. During the pushing forward period of the coal mining face,the deformation of the mine gateway was small. Even at the period of the initial roof weighting and periodical roof weighting,the deformation of the mine gateway was not obviously increased. Meanwhile,with the data analysis,the advance influence scope of the support pressure in the coal mining face provided was 5 m and after over 5 m,the advance support pressure of the coal mining face would be small in variation. The seismic wave velocity CT detection also showed that there was a stress concentrated zone existed at a distance of 0 ~ 20 m to the coal mining face.