沙吉海煤矿砾岩层砾石粒度及强度特征分析  

Gravel Granularity and Strength Characteristic of Boulder Bed in Shajihai Colliery

作　　者：王晓雷[1,2] 刘治国[3] 吕晓磊 

机构地区：[1]中国矿业大学(北京),北京100083 [2]河北联合大学,河北唐山063009 [3]天地科技股份有限公司开采设计事业部,北京100013 [4]国网能源和丰煤电有限公司沙吉海煤矿,新疆塔城834411

出　　处：《煤矿开采》2012年第2期26-28,共3页Coal Mining Technology

基　　金：河北省自然科学基金资助项目(D2010000921);唐山市科技局资助项目(10130212C)

摘　　要：沙吉海煤矿B213煤层直接顶板为砾岩层,由砾石和砂岩胶结而成,给巷道支护带来了很大困难,为了安全高效开采B213煤层,有必要研究砾岩层中砾石的粒度及强度特征。本文对砾岩层中砾石的粒度特征进行了统计分析,统计分析了不同组别砾石数量及体积所占的百分比;采用点荷载测试法对砾石单轴抗压强度进行了测试,结果表明砾石的单轴抗压强度很大,特别是青黑色砾石,一般都在200MPa以上,最高的甚至可达300MPa以上。Immediate roof of B213 coal-seam is gravel seam bonded with gravel and sandstone in Shajihai Colliery which brings difficulty for roadway supporting.So it is necessary that researching gravel granularity and strength characteristic of boulder bed.Gravel quantity and volume percent was analyzed by statistics.Single-axial compression strength was tested by point load method.Results showed that single-axial compression strength of gravel was very large,especially that of lividity gravel usually was over 200MPa,even reaches over 300MPa.

关 键 词：砾石 粒度特征 强度特征 点荷载 

分 类 号：TD315[矿业工程—矿井建设]