采矿与安全工程学报 ›› 2014, Vol. 31 ›› Issue (4): 601-606.

• 论文 • 上一篇    下一篇

深部巷道破裂围岩强度衰减模型及其在FLAC3D中的实现

  

  1. 1.河南理工大学能源科学与工程学院,河南 焦作 454000;2.中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏 徐州 221116;3.河南理工大学深部矿井建设重点学科开放实验室,河南 焦作 454000;4.中国矿业大学(北京)资源与安全工程学院,北京 100083
  • 出版日期:2014-07-15 发布日期:2014-08-28
  • 作者简介:牛双建(1983—),男,河南省开封市人,讲师,工学博士,从事非连续岩体力学与巷道围岩加固方面的教学与研究。 通信作者:杨大方 E-mail:yangdafang@hpu.edu.cn Tel:0391-3987690
  • 基金资助:

    国家自然科学基金项目(51304068,51374198);中国矿业大学深部岩土力学与地下工程国家重点实验室开放基金项目(SKLGDUEK 1207);河南理工大学深部矿井建设重点学科开放实验室开放基金项目(2012KF-03);河南理工大学博士基金项目(B2012-048)

Strength degradation model of fractured surrounding rock in deep roadway and its implementation in FLAC3D

  • Online:2014-07-15 Published:2014-08-28

摘要: 基于深部巷道破裂围岩强度衰减规律研究成果,选择塑性参数作为损伤因子,根据室内预制初始损伤破裂岩样加卸载及其各级围压下的三轴压缩两试验结果,分别计算不同损伤破碎程度岩样卸载点的塑性参数值(初始损伤因子值)及其剪切强度参数c,φ值,初步建立深部巷道破裂围岩强度衰减模型;通过对初步建立的强度衰减模型中塑性参数的替换推导,建立以塑性参数εps表示的深部巷道破裂围岩强度衰减模型,使其可以直接运用于理论分析和数值模拟;将该模型植入FLAC3D中,结合实际深部巷道工程,对千米深井深部典型变形破坏巷道进行数值模拟分析,将数值模拟结果及相关结论与室内物理模拟和工程现场测试结果进行综合对比分析,验证了所建立模型的合理性。

关键词: 深部巷道, 破裂围岩, 强度衰减, 塑性参数, 剪切强度参数

Abstract: Based on the research result of strength degradation law of fractured surrounding rock at post-peak in deep roadway, plastic parameters having been selected as the damage factor, the value of plastic parameters (initial damage factor value) and the shear strength parameters c, φ in unloading point of rock samples with different damage degree are calculated respectively according to the results of the interior precast initial damaged rock samples loading-unloading test and triaxial compression test conducted under all levels of confining pressure. The strength degradation model of damaged surround- ing rock in the deep roadway is preliminarily established. Through the replacement and derivation of the plastic parameters in the preliminary established strength degradation model, the final strength degradation model of damaged surrounding rock in the deep roadway, represented by the plastic parameter εps, is established so that it can be directly applied to the theoretical analysis and numerical simulation. When the model is implanted in FLAC3D, and then combined with the actual deep roadway engineering, the numerical simulation analysis is conducted in deep typical deformed and failure roadway in km deep mine. After the comprehensive comparison of numerical simulation results and its related conclusions with interior physical simulation and engineering field test results, the reasonableness of the established model is verified.

Key words: deep roadway, fractured surrounding rock, strength degradation, plastic parameter, shear strength parameter