采矿与安全工程学报 ›› 2015, Vol. 32 ›› Issue (4): 623-627.

• 论文 • 上一篇    下一篇

有限元强度增加法模拟综放开采覆岩垮落带与裂隙区分布

  

  1. 1.河南理工大学瓦斯地质与瓦斯治理重点实验室,河南 焦作 454000;2.中原经济区煤层(页岩)气河南省协同创新中心,河南 焦作 454000;3.河南工程技术学校采矿工程系,河南 焦作 454003; 4.贵州省煤矿设计研究院,贵州 贵阳 550025
  • 收稿日期:2013-12-28 出版日期:2015-07-15 发布日期:2019-09-02
  • 作者简介:雷文杰(1972-),男,安徽省潜山县人,博士后,研究员,从事煤矿地质灾害预测与治理方面的研究。
  • 基金资助:

    国家重大专项项目(2011ZX05040-005);国家自然科学基金项目(51374094,U1361205,51374093);河南省2009 年高校青年骨干教师资助计划项目;河南理工大学博士基金资助项目

Simulation of cover rock caving zone and fractured distribution in fully mechanized caving mining by strength increase finite element method (FEM)

  • Received:2013-12-28 Online:2015-07-15 Published:2019-09-02

摘要: 在完善平面应变条件下Drucker-Prager 内切圆屈服准则推导过程的基础上,推导出 Drucker-Prager 内切圆向外切圆直接转换系数,及内摩擦角强度增加系数的适用范围,提出有限元强度增加的非连续介质极限分析方法。建立由煤层和上覆岩层组成的综放开采有限元模型,通过煤岩体强度增加获得工作面周期来压时顶煤、上覆岩层的极限状态,以及上覆岩层的垮落形状和裂隙带分布,并采取经验方法验证冒落带、裂隙带高度的可靠性,从而为非连续介质临界状态特征分析提供一种新的分析方法。

关键词: 有限元强度增加法, Mohr-Coulomb 内切圆, 综放开采, 垮落形状, 裂隙分布

Abstract: Based on the improving the derivation process on the yielding criterion of Drucker-Prager incircle under the condition of plain strain, the direct coefficient of transforming from Drucker-Prager incircle to circum-circle and the suitable application scope of strength increase on the internal friction angle have been deduced. Then based on the strength increase FEM, the limit analysis method of discrete medium has been put forward. The FEM model of the fully mechanized caving mine formed by coal seam and overlying strata has been built up. By the over-stratum and coal strength increasing, the model reaches its critical state in the roof and overlying strata under the periodic weighting. And the roof caving surface shape and the fissure distribution have been obtained automatically. The result of caving and fissure height by strength increase FEM has been confirmed by empirical method, resulting from which, a new method to analyze the features of discrete media of critical state has been provided.

Key words: strength increase FEM, yielding criterion matching with Mohr-Coulomb, fully mechanized longwall top coal caving, roof caving surface, fissure distribution