煤堆开挖过程失稳破坏塌滑机理与模拟分析

发布时间：2018-02-13 08:53

本文关键词： 矿业安全煤堆开挖失稳模拟分析　出处：《辽宁工程技术大学学报(自然科学版)》2017年05期 　论文类型：期刊论文

【摘要】：为防止煤堆在开挖过程中失稳滑坡,导致施工机械和人员损伤,造成安全生产事故.分析了煤颗粒此类散粒体的应力应变特征及煤堆开挖过程的失稳机理.根据这些特征,使用基于颗粒流理论的PFC3D对煤堆开挖过程进行了模拟.对实例煤堆提出了一套开挖过程,分为8种工况,给出了开挖稳定后的颗粒图、位移图和CForce图.模拟结果表明:煤堆开挖过程的变形可分为三个阶段:工况1~工况3、工况4~工况6、工况7~工况8,分别代表煤堆的稳定阶段、过渡阶段和失稳阶段,并对其变形特征进行了描述.最后建议煤堆开挖应处于过渡阶段,即煤堆开挖高度应为9.4~16.45 m.
[Abstract]:In order to prevent unstable landslide of coal pile during excavation, cause damage to construction machinery and personnel and cause safety production accident, the stress-strain characteristics of such granular particles and the mechanism of instability during excavation of coal pile are analyzed. According to these characteristics, the mechanism of instability during excavation of coal pile is analyzed. The excavation process of coal pile is simulated by PFC3D based on particle flow theory. A set of excavation process is proposed for practical coal pile, which is divided into 8 working conditions, and the particle diagram after excavation stability is given. Displacement diagram and CForce diagram. The simulation results show that the deformation of coal pile excavation can be divided into three stages: 1 ~ 3 working conditions, 4 ~ 6 working conditions, 7 ~ 8 working conditions, representing the stable stage, transition stage and instability stage of coal pile, respectively. Finally, it is suggested that the excavation of coal pile should be in the transitional stage, that is, the height of coal pile excavation should be 9.4 ~ 16.45 m.
【作者单位】：辽宁工程技术大学工商管理学院;辽宁工程技术大学安全科学与工程学院;矿山热动力灾害与防治教育部重点实验室;大连交通大学辽宁省隧道与地下结构工程技术研究中心;
【基金】：国家自然科学基金项目(51274110;51474121;U1361211)
【分类号】：TD771

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