分层高压速凝注浆技术在破碎矿体开采中的应用

Application of layered high-pressure and fast-set grouting technology on the broken ore body exploitation

某铜矿地质构造以断层为主,节理裂隙发育,井巷围岩稳固性低,局部围岩相当破碎,需大量加固支护。设计采用了分层高压速凝注浆技术,应用分段凿岩阶段矿房采矿法对4#破碎矿体进行开采。详述了高压注浆加固方案及注浆工程布置、注浆主要参数计算、注浆工艺过程。分层高压速凝注浆技术很好地解决了岩体稳固性差、采出矿石含泥量较高等问题,成孔率提高了25%;提高了矿岩自稳性,大大增加了顶板和上盘围岩允许暴露面积,空场采矿法的采场结构进一步优化;降低了爆破后的矿石含泥量,提高了放矿效率,矿石回收率提高了23.3%;增强了采矿作业的安全性。

The geological structure of a copper mine is mainly controlled by faults with developed joint fissures,as a result of which,the surrounding rock of the shafts and drifts is fairly unstable,instable local wall rock prevails,and a large amount of reinforcement and support are required.This paper brings forward a proposal of utilizing layered high-pressure fast-set grouting technology.Block stoping method with sublevel drilling was adopted to mine 4# broken orebody.And the programme of high-pressure reinforcement,layout of the grouting project,the calculation of the main grouting parameters and the grouting process are introduced in detail.This method is a good solution to issues such as poor rock stability and high clay content of mined ore,and the drillhole integrity is increased by 25 %.Fabulous effects are achieved with the application of this proposal： improving ore rock stability,greatly increasing the allowed exposed area of the roof and hanging wall,optimizing structure of the open stope method,reducing clay-content of the mined ores,improving ore drawing efficiency,increasing ore recovery rate by 23.3 %,and enhancing safety of mining operations.