复合顶板巷道分类及控制技术研究

针对复合泥岩顶板巷道在采掘过程中出现的垮冒灾害难题,根据顶板中复合泥岩的厚度和分布位置对此类巷道进行分类,并在此基础上建立力学模型,分析引起顶板变形或冒顶的根源,提出采用"高预应力锚杆索+索桁架体"联合控制技术,现场工程试验表明,该技术能有效控制顶板变形,保障了顶板支护稳定性。

Study on the classification of coal roadway with compound roof and controlling technology

Aiming at the roof collapse problem of the coal roadway with compound mudstone strata in the period of the roadway excavation or working face mining, firstly, the roadway is classified in combination with thickness value of the compound mudstone and concrete location in the roof strata. On the basis of the above classification results, a mechanical model is built, which is used to obtain the source of the large roof deformation or the roof caving to this type of roadway, and then a combining controlling technology including bolt, cable and cable truss support with high pre-tightening force is proposed. Finally, this type of support technology is applied to the field roadway and the trial results show that the roof deformation is controlled effectively and ensure the supported roof stability.