露天矿山石材开采岩爆分析  

Rock burst analysis of stones in the open-pit mine

作　　者：王宇晨 张晓君[1] WANG Yuchen;ZHANG Xiaojun(School of Resources and Environmental Engineering,Shandong University of Technology,Zibo 255049,China)

机构地区：[1]山东理工大学资源与环境工程学院,山东淄博255049

出　　处：《山东理工大学学报（自然科学版）》2022年第2期1-5,共5页Journal of Shandong University of Technology:Natural Science Edition

基　　金：国家自然科学基金项目(51904178);山东省自然科学基金项目(ZR2020ME098)。

摘　　要：针对露天矿山石材开采岩爆研究不足问题,分别从矿物成分、力学性质及热应力等方面分析了五莲石材岩爆机理,结果表明:五莲石材是中粗粒结构,比细粒结构的石材强度低,同等情况下,五莲石材更易发生破坏;五莲石材具有强烈的岩爆倾向性,其抗拉强度很低,极易发生劈裂岩爆,这是五莲石材岩爆的重要内因。夏季露天开采石材本身受热温度较高,同时受光照、环境、开采工艺等影响导致其温差变化也较大,将产生较大的热应力;当石材内部各点的热应力超过其抗拉强度时将导致石材内部产生热破裂,进而诱发石材岩爆,同等情况下,短时局部温度变化对石材的影响很大,极易导致石材发生岩爆破坏,这是五莲石材岩爆的重要外因。In view of deficient study on rock burst of stones in open-pit mines,this paper analyzes the rock burst mechanism of Wulian stone from the aspects of mineral composition,mechanical properties and thermal stress.The strength of Wulian stone is lower than that of fine-grained stone.Under the same conditions,Wulian stone is more easily damaged.Wulian stone has a strong tendency of rock burst,and its tensile strength is so low that it is extremely easy to crack,which is an important internal cause of the rock burst of Wulian stone.The temperature of open-air stone is higher in summer,as well as the larger temperature difference caused by the influence of light,environment and mining technology,will produce greater thermal stress.Once the thermal stress of each point inside the stone exceeds its tensile strength,it will lead to the thermal cracking inside the stone and following rock burst.Under the same circumstances,the short-term and local temperature change has a great influence on the stone,making it more subject to lead to rock burst,which is an important external cause of Wulian stone′s rock burst.

关 键 词：岩爆 露天开采 石材 温度 热应力 

分 类 号：TD315[矿业工程—矿井建设]