论文部分内容阅读
1 工作面简介 1.1 工作面地质情况 307盘区3#层8708工作面位于307风井西南部,东西向布置,走向长度859.7m,工作面长度140m,煤层厚度2.6～3.5m,平均厚度2.96m,工作面直接顶分3层,由下而上依次分为5.73m厚的深灰色粉砂岩,6.8m厚的细砂岩,7.51m厚的粉砂岩;直接顶总厚度20.8m。
1 Face Introduction 1.1 Face Geological Conditions 307 Panel 3 # layer 8708 face is located in the southwest of 307 air shaft, east-west layout, the length of 859.7m, working face length 140m, thickness of coal seam 2.6 ~ 3.5m, the average thickness of 2.96m The working face is directly divided into 3 layers and divided into 5.73m thick dark gray siltstone, 6.8m thick fine sandstone and 7.51m thick siltstone from bottom to top. The direct top total thickness is 20.8m.