不同纤维种类及掺量条件下胶结充填体力学行为研究  

Study on the mechanical behavior of cemented filling body with admixture of different fiber types and contents

作　　者：王元民 由松江 马章印 王钰淏 张凯 郎晓东 Wang Yuanmin;You Songjiang;Ma Zhangyin;Wang Yuhao;Zhang Kai;Lang Xiaodong(Songxian Shanjin Mining Co.,Ltd.)

机构地区：[1]嵩县山金矿业有限公司

出　　处：《黄金》2023年第11期18-22,共5页Gold

基　　金：省属本科高校基本科研业务费(K2022QN008)。

摘　　要：为改善嵩县山金胶结充填体稳定性,开展了不同玻璃纤维、玄武岩纤维和聚丙烯纤维种类及不同掺量条件下的胶结充填体抗压强度试验,对比研究纤维对胶结充填体抗压强度及破坏形态的影响规律。试验结果表明:聚丙烯纤维对胶结充填体抗压强度的改善效果最为显著,其次为玄武岩纤维和玻璃纤维;不同纤维掺量条件下胶结充填体抗压强度变化呈现先增大后减小的趋势,当纤维体积掺量为0.2%时胶结充填体的抗压强度最高,此外纤维的加入对灰砂比较低的胶结充填体抗压强度改善更为明显。纤维掺量在不同养护龄期对胶结充填体的影响程度均大于纤维种类。在抗压强度试验下,未添加纤维的胶结充填体破坏时产生片落和裂纹贯穿现象,添加纤维的胶结充填体破坏时裂纹粗而长,并且产生了更多的细裂纹。In order to improve the stability of the cemented filling body in Songxian Shanjin,this paper conducted compressive strength tests on cemented filling bodies under different types and contents of glass fiber,basalt fiber,and polypropylene fiber,and compared the influence of fibers on the compressive strength and failure morphology of the cemented filling body.The experimental results show that polypropylene fiber has the most significant improvement effect on the macroscopic strength of the cemented filling body,followed by basalt fiber and glass fiber;under different fiber content conditions,the compressive strength of the cemented filling body shows a trend of increase at first and then decrease.When the fiber volume content is 0.2%,the compressive strength of the cemented filling body is the highest.In addition,the addition of fibers has a more significant improvement in the compressive strength of cemented filling body with lower ash-sand ratios.The influence of fiber content on the cemented filling body at different curing ages is greater than that of fiber types.In the compressive strength test,the cemented filling body without added fibers experienced spalling and crack penetration during failure,while the cemented filling body with added fibers experienced coarse and long cracks during failure,with more fine cracks generated.

关 键 词：尾砂胶结充填 下向开采 纤维 力学特性 稳定性 抗压强度 

分 类 号：TD853.34[矿业工程—金属矿开采]