采场充填分层次数对充填体强度的折减效应  

Reduction Effect of Stope Filling Layering Times on Filling Body Strength

作　　者：沈慧明 吴爱祥 焦华喆 王贻明[1] SHEN Huiming;WU Aixiang;JIAO Huazhe;WANG Yiming(School of Civil Engineering and Resources,University of Science and Technology Beijing;China Tungsten Hightech Materials Co.,Ltd.;School of civil engineering,Henan Polytechnic University)

机构地区：[1]北京科技大学土木与资源工程学院 [2]中钨高新材料股份有限公司 [3]河南理工大学土木工程学院

出　　处：《现代矿业》2021年第10期74-78,83,共6页Modern Mining

基　　金：国家自然科学基金项目(编号:51834001,52104129);中国博士后科学基金面上项目(编号:2020M672226);河南省重点研发与推广专项(科技攻关)项目(编号:212102310107,212102310602);金属矿山高效开采与安全教育部重点实验室开放基金(编号:ustbmslab201904)。

摘　　要：为分析充填次数对充填体强度的影响,开展分次浇筑的充填体试块检测,分析分次充填体破坏模式,研究浇筑次数对充填体强度折减的影响规律,并通过细观数值模拟揭示分层充填体试块破坏机理。结果表明,随着填充次数的增多,充填体试件的单轴抗压强度值呈减小趋势。当充填体浓度为65%~75%,分层数为2~4层时,对应强度折减系数k值介于0.613~0.929。在多次充填后分层与分层之间形成了低强度夹层,导致分层面处出现不同程度的分离、错动现象,从而降低了充填体的整体承压能力。To analyze the influence of filling times on the strength of filling body,the filling block test of graded pouring was carried out,and the failure mode of graded filling was analyzed.The influence of pouring times on the strength reduction of filling was studied,and the failure mechanism of layered filling block was revealed by meso-numerical simulation.The results show that with the increase of filling times,the uniaxial compressive strength of the filling specimen decreases.When the filling concentration is 65%~75%and the number of layers is 2~4,the corresponding strength reduction coefficient k is between 0.613~0.929.After multiple filling,a low strength interlayer is formed between the layers,which leads to different degrees of separation and dislocation at the sub-layers,thus reducing the overall pressure bearing capacity of the filling body.

关 键 词：金属矿山 分次充填 强度折减 破坏机理 

分 类 号：TD853.34[矿业工程—金属矿开采]