贾楠,吴超,罗周全,石东平,谢承煜

• 1:中南大学资源与安全工程学院

摘要(Abstract)：

为更好地再现地下金属矿深部采空区爆破扰动响应模型,将实测并去噪的爆破振动曲线作为动力加载,运用三维动力有限差分法,揭示围岩非线性演化特性并探讨采动顺序对其稳定性影响。动力扰动下,采空区顶、底板的最大、最小主应力明显大于其它部位,且出现拉应力;质点爆破振动监测时程曲线非线性特性强烈;垂直振动速度主要集中于采空区顶、底板,最大值25.2 cm/s。爆破瞬间,采空区东帮(先开挖侧)水平动位移值呈非线性上升,出现较大的动应力集中系数波动幅度和水平振动速度最大值(21.9 cm/s);塑性区也主要集中于东帮围岩且剪应变增量也相对较大。研究表明:采动顺序一定程度上影响了围岩稳定性,并且依据动力响应特性分析结果调整参数后的爆破设计有效控制了爆破边界,提高采场稳定性。

关键词(KeyWords)： 采空区围岩;动力扰动;非线性响应;演化特性;实测验证

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助(51274250);; 国家“十二五”科技支撑计划项目资助(No.2012BAK09B02-05)

作者(Author): 贾楠,吴超,罗周全,石东平,谢承煜

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