立井延深预留保护岩柱的设计

Design of Rock Pillar Left in Advance of Shaft Deepening

一、安全保护设施的选择生产矿井要不断进行新水平的开拓延深,以保证矿井生产的正常接续。立井延深是在原有井筒全断面或部分断面正常提升的情况下进行施工。为实现生产和延深两不误,使延深工作面不受提升容器、矿车和矸石等坠落物的威胁,在原有井筒与延深工作面之间,设置安全保护设施。一般有两种基本形式的保护设施: 1.构筑人工保护盘我国立井延深采用的人工保护盘有水平保护盘、斜保护盘和楔形保护盘等。

This,paper introduces the method for deepening the auxiliary shaft in Longfeng Colliery by loading natural rock pillars.The formulae for calculating the thickness of the pillar based on author's derivation are,where h,thickness of the rock pillar,K,safety coefficient,F,impact force of falling matter on the rock pillar,r,the radius of the shaft,τ_n,the ultimate shear stress on the side of the failed rock cone,P,the weight of falling matter,t,impact time,σ_c、σ_p、τ,the compression,tensile and shear strengths of the rockmass.Finally calculation is made,taking the deepening project of auxiliary shaft as an example,and based on the obtained result,the thickness of the rock pillar shoulb ed 5m.