金属矿山巷道过泥化闪长岩断层掘进支护工艺

Heading and Support Technology of Metal Mine Roadway Passing Through Argillized Diorite Fault

白象山铁矿-390m水平巷道施工中,需穿越泥化闪长岩断层破碎带,导水性明显,采用管棚法通过,地面注浆、工作面注浆与超前小导管注浆相结合的措施防治水,超前钻孔探明断层产状。施工时,先将巷道工作面后方5m范围内刷大并进行支护,用作管棚钻机钻场。然后利用液压钻机施工管棚和地质钻孔。钻探过程中,出现涌水及塌孔时,及时注浆,然后扫孔复钻,保证钻孔进入稳定岩层5m以上。地质钻孔和超前管棚施工完毕,施工至破碎带时,增加超前小导管注浆护顶工艺,与浅孔爆破、短段掘支相结合,安全顺利地通过了断层破碎带。

In a construction of a -390m level roadway in Baixiangshan Iron Mine ,the roadway had to pass through a broken zone of an argillized diorite fault with obvious water flow.A pipe shield method in combination with the measures of the surface grouting ,working face grouting and advance small guide tube grouting was applied to the water prevention and control and the fault status was proved with advance borehole drilling.During the construction operation ,the mine roadway behind 5m of the working face was enlarged and supported ,a pipe shield was applied to the drilling site and the pipe shield and geological drilling were conducted with a hydraulic drilling rig.During the drilling opera-tion ,when a water inflow and borehole collapsed occurred ,a grouting operation would be timely con-ducted and a borehole reaming and re-drilling operation would be conducted in order to ensure the borehole with a depth over 5m in the stable rock stratum.When the geological drilling and advance pipe shield construction completed and the construction was at the broken zone ,an advance small guide tube grouting and roof control technology was enhanced in combination with the a shallow borehole blasting and short sectional heading and support.The mine roadway was safety and successfully passed through the broken zone of the fault.