| 顶板诱导崩落模式选择时变数值分析 |
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| 引用本文： | 胡建华,苏家红,周科平,张世超,古德生.顶板诱导崩落模式选择时变数值分析[J].岩土力学,2008,29(4):931-936. |
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| 作者姓名： | 胡建华 苏家红 周科平 张世超 古德生 |
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| 作者单位： | 中南大学,资源与安全工程学院,湖南省深部金属矿产开发与灾害控制重点实验室,长沙,420083 |
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| 基金项目： | 国家自然科学基金
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高等学校博士学科点专项科研项目
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中南大学理科发展基金 |
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| 摘 要： | 顶板诱导崩落是一种新的空区处理技术，其实施效果与诱导崩落施工路径、方法和顺序有关，同时矿岩体作为一种弹塑性体，具有非线性时变力学特征。运用时变力学的基本理论，建立了顶板诱导崩落的时变力学有限元基本方程。针对大厂铜坑矿92号矿体试验采场的地质特征，构建了顶板诱导崩落的时变力学有限元模型，采用多步骤开挖模拟两种不同顶板诱导崩落模式，研究两种不同工序的顶板塑性区发展、东西预裂与崩顶硐室的位移及其安全系数，分析了其对采场的综合效应。结果表明，先预裂后崩顶的顶板诱导崩落模式有利于顶板崩落诱导，并综合考虑诱导崩落效果与作业安全，建议采用先预裂爆破后强制崩顶的微差爆破一次成型工艺。
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| 关 键 词： | 诱导崩落 时变力学 有限元法 稳定性 |
| 文章编号： | 1000-7598-(2008)04-931-06 |
| 收稿时间： | 2006-03-28 |
| 修稿时间： | 2006年3月28日 |
Time-varying numerical analysis of mode in induction caving roof |
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| Hu Jian-hua,Su Jia-hong,Zhou Ke-ping,Zhang Shi-chao,Gu De-sheng.Time-varying numerical analysis of mode in induction caving roof[J].Rock and Soil Mechanics,2008,29(4):931-936. |
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| Authors: | Hu Jian-hua Su Jia-hong Zhou Ke-ping Zhang Shi-chao Gu De-sheng |
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| Institution: | School of Resources and Safety Engineering, Central South University, Changsha 410083, China; Key Laboratory of Deep Mining & Disaster Control in Hunan Province |
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| Abstract: | New method for handling roof of emptied areas based successive mining is proposed, which is induction caving roof. The effect of induction caving roof is relative to the construct path, the mining method and the order of the induction caving. At the same time, the physical properties of mine and rock are nonlinear material properties (elastoplastic material). The system of induction caving roof is the nonlinear and the time-varying system, The FEM basic equations are built according to the theory of the time-varying mechanics. Then based the geology and the ore characteristic, the 2D FEM time-varying mechanical model is built in the testing stope of the Tongkeng Mine, the technology of the many steps is used to simulate the time-varying mechanical behavior, special the expanding of the plastic zone, the displacement and the safety factor in the tunnel to the two kinds mode of the induction caving roof. The effects are analyzed to the safety of the stope and the influences on the mine technology. The results show that it is advantage to induction caving roof, for which it is the technology the first pre-splitting blasting and the last forced caving. According to the results, it is proposed that the millisecond blasting between the first pre-splitting blasting bolts and the last bolts in the same time. |
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| Keywords: | induction caving time-varying mechanics finite element method stability |
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