极近距离跨采工作面合理布置及巷道支护技术

Reasonable Arrangement and Roadway Support Technology for Very Close Over- roadway Mining Face

针对某矿22103工作面即将通过-413水平大巷顶板这一工程实际问题,为实现连续开采,决定采用跨采法通过底板巷道。采用理论分析的方法,估算出工作面与巷道的最小安全岩柱厚度为5.9 m。根据估算结果、底板大巷钻孔参数及工作面与底板巷道的空间位置关系,留设直角梯形状保护煤柱。跨采期间,按照大巷可能受到的采动影响,对底板巷道进行分段支护,并在巷道内设置监测点进行观察。结果表明:跨采阶段2条底板大巷围岩变形规律一致,不同分段处围岩变形量有差异,基本呈由中部向两端逐步递减趋势。顶板最大下沉量112 mm,巷道两帮最大移近量91 mm,均在可控范围内。

In view of the practical engineering problems,that 22103 working face will across- 413 level main roadway roof,cross-mining method is used to realize continuous mining. By using theoretical analysis method,we estimated that the minimum roadway safety rock pillar thickness is 5. 9 m. According to the results of calculation,drilling parameters of main roadway and spatial position relationship between working face and floor roadway,a protective coal pillar with the shape of right- angled trapezoid is reserved. During the period of cross- mining,the main roadway under floor is segmented support influenced by mining,and a lot of monitor points are set along the roadway to observe strata behaviors. The results shows that there are differences in surrounding rock deformation of different sections along main roadway,deformation law of surrounding rock of two main roadway is basically identical,that the deformation of surrounding rock is gradually decreased from the middle to two ends of face. The maximum roof subsidence is 112 mm and the maximum two- side convergence is 91 mm,which are within controllable range.