尾砂胶结块体压缩及粉化特性试验研究

地下采矿引起了地表塌陷和错动；尾矿库储存尾砂能力有限，同时又受到征地限制。为综合解决这两个问题，针对金山店铁矿现状，采用半干胶结块体充填塌陷区。但在上覆和周围岩层再塌陷过程中，充填块体易破碎粉化并诱发深部采空区泥石流。因此，需要研究塌陷后充填块体的粉化率以及诱发泥石流的可能性。为此，分别对抗压强度为1、3 MPa的尾砂胶结块体和抗压强度为6 MPa的尾砂胶结块体与废石混合体进行分级压缩，并记录竖向应力-应变；当加载到某一级荷载胶结块体发生破碎并粉化时，取样进行颗粒筛分试验，分析破碎块体的粒径分布曲线。对试验结果分析可得，在采空区发生塌陷压缩胶结块体时，各种状态下的块体粉化率为8%～15%；胶结块体与废石混合充填，可有效降低围岩塌陷后充填体破碎的块体粉化率，结合泥石流试验结果，尾砂胶结块体充填诱发泥石流的可能性较小；即使发生，也能保证矿区井下正常生产

Experimental study of characteristics of compression and pulverization for cemented tailings blocks

It formed a subsidence area and expanded the offset in surface because of underground mining.The mine waste reservoir was limited to storage much more tailings and expropriation was restricted by limited land.In order to solve these two problems,it was intended to backfill the disease area with semi-dry cemented blocks about the actualities in Jinshandian Iron Mine.When the overlying and surrounding strata collapse again,the filling block will be broken and pulverized easily,and which would induce debris fl...