基于岩体分级的内蒙古黑牛王矿山支护设计理论研究

内蒙古黑牛王铅锌矿地压显现明显,矿体松散破碎,开采损失贫化大。在采动作用下常出现局部冒落,严重影响了矿山的安全生产。为维护巷道的稳定性,通过对黑牛王铅锌矿的现场工程地质调查,结合室内岩石力学实验,基于Q、RMR、GSI分级对矿区岩体进行质量评价,并通过理论分析,在岩体质量分级结果的基础上提出采用分类支护方法。围岩较稳固区段,可先采用网度为2.0m×2.0m的管缝式锚杆临时支护;围岩较破碎区段,顶板采用树脂锚杆,两帮采用管缝式锚杆+金属网+双筋条支护,锚杆长度为2.4m,锚杆间排距为1.2m,局部不稳定性区段喷射混凝土,喷射混凝土厚度至少为50mm,强度C20,支护区段距离掘进工作面最大未支护距离为8m。本研究对有效控制巷道围岩变形、冒落,增大巷道成型率,大幅度降低矿山支护成本具有一定的理论意义。

Theoretical Research on Support Design of Heiniuwang Mine in Neimenggu Based on Rock Mass Classification

The ground pressure of Heiniuwang lead-zinc mine in Neimengguis obviously,the ore body is loose and broken,and the large mining loss and dilution.Local caving often occurs during mining,which seriously affects the safety production of the mine.In order to maintain the stability of the roadway,through the field engineering geological survey of Heiniuwang lead-zinc mine,and combined with rock mechanics experiment.Based on the classification of Q,RMR and GSI,the quality of rock mass in the mining area is evaluated,and through theoretical analysis,the classification support method is proposed on the basis of the classification results of rock mass quality.For the relatively stable surrounding rock area,the slotted bolt with a mesh of 2.0 m×2.0 mcan be used for temporary support.For the relativety brokensurrounding rock area,the roof is supproted by resin bolt,and the two sidewalls are supported by slotted bolt+ metal mesh+double bar support,the length of the bolt is 2.4 m,and the row spacing between the bolts is 1.2 m.Shotcrete for local instability area,shotcrete thickness is at least 50 mm,strength C20.The maximum unsupported distance from the supporting section to the tunneling face is 8 m.This study has significant theoretical significance for effectively controlling the deformation and caving of roadway surrounding rock,increasing the roadway forming rate and greatly reducing the support cost.