基于煤矸石填料的路基结构体受力性能分析  

Analysis of mechanical performance of roadbed structure based on coal gangue filler

作　　者：王辉 WANG Hui(Zhengzhou Road&Bridge Construction Investment Group Co.Ltd.,Zhengzhou 450000,China)

机构地区：[1]郑州路桥建设投资集团有限公司,郑州450000

出　　处：《矿冶》2022年第2期88-93,共6页Mining And Metallurgy

基　　金：河南省科学技术厅软科学研究项目(202400410289)。

摘　　要：为进一步探索煤矸石作为路基填料的应用性能,减小矿山煤矸石堆积压力,达到煤矸石资源化再利用的目的,采集黄陵煤矿二号矿区堆积的煤矸石,通过对其物理性质进行分析和点荷载力学试验,得到该矿区煤矸石的特性和强度值,并运用击实试验和CBR试验对填料进行了路基填筑性能分析。结果表明,煤矸石点荷载强度指数约为2.8 MPa,经点荷载换算,煤矸石的抗压强度为65 MPa,抗拉强度为2.8 MPa,可以代替天然土层用作路基填料;其形状规则、结构致密性好,有助于增加路基的强度;燃烧后的煤矸石最佳含水率为12.7%,燃烧后的煤矸石和混合物土的最佳含水率为16.4%,未燃煤矸石的最佳含水率为10.8%,未燃煤矸石和土混合物的最佳含水率为14.8%;燃烧后的煤矸石强度低于未燃煤矸石强度,掺土的煤矸石强度低于无土煤矸石强度;室内CBR试验值和实际沉降观测值满足相应公路等级规范要求,可用于路基或者房建等的基础工程。In order to further explore the application performance of coal gangue as subgrade filling,reduce the pressure of mine gangue accumulation,and achieve the goal of coal gangue resource reuse,this paper collects coal gangue accumulated in No.2 mining area of Huangling Coal Mine.Through analyzing its physical properties and mechanical point load test,the characteristics and strength value of the mining area coal gangue are obtained,and the performance of subgrade reclamation by the compaction test and CBR test.The results show that the point load strength index of gangue is about 2.8 MPa,and the compressive strength and tensile strength of gangue converted by point load are 65 MPa and 2.8 MPa,respectively.Coal gangue can be used as roadbed filling instead of natural soil layer.The shape of gangue is regular and the structure is compact,which is helpful to increase the strength of the roadbed.The optimum moisture content of gangue after combustion is 12.7%,that of gangue and soil mixture after combustion is 16.4%,that of gangue without burning coal is 10.8%,and that of gangue and soil mixture without burning coal is 14.8%.The strength of combusted gangue is lower than that of unburned gangue,and the strength of soil-mixed gangue is lower than that of soilless gangue.The indoor CBR test value and the actual settlement observation value meet the requirements of the corresponding highway grade specification,and can be used in the foundation engineering such as roadbed or house construction.

关 键 词：煤矸石 路基填料 击实试验 点荷载试验 

分 类 号：TD984[矿业工程—选矿] U215[交通运输工程—道路与铁道工程]