采矿与安全工程学报 ›› 2014, Vol. 31 ›› Issue (2): 299-303.

• 论文 • 上一篇    下一篇

负温条件下梅林庙矿红砂岩强度特性及变形规律研究

  

  1. 中国矿业大学(北京)力学与建筑工程学院,北京 100083
  • 出版日期:2014-03-15 发布日期:2014-03-20
  • 作者简介:单仁亮(1964-),男,江苏省大丰市人,博士,教授,博士生导师,从事岩土工程方面的教学与研究。 E-mail:srl@cumtb.edu.cn Tel:010-62331019
  • 基金资助:

    国家自然科学基金委员会与神华集团有限责任公司联合资助项目(U1261126);中央高校基本科研业务费专项基金项目(2010YL09)

Study on the strength characteristics and deformation rule of red sandstone in Meilinmiao mine under negative temperature

  • Online:2014-03-15 Published:2014-03-20

摘要: 利用冻三轴试验机研究了负温条件下梅林庙矿红砂岩的力学特性与变形规律。在-15 ℃低温条件下对红砂岩施加4种围压,分析了围压对岩石强度和弹性模量的影响。结果表明,在冻结条件下红砂岩轴向抗压强度与围压、弹性模量与围压均呈线性关系,红砂岩仍然遵循库仑强度准则。经回归分析得到红砂岩黏聚力为12.7 MPa,内摩擦角为30.4°。岩石破坏形式与围压大小相关。

关键词: 冻结岩石, 冻三轴试验, 轴向抗压强度, 弹性模量, 负温

Abstract: The study of mechanical properties and deformation rule of Meilinmiao red sandstone have been conducted on freezing triaxial test machine. Four different confining pressures are applied separately on the samples at -15 ℃, and the effect of confining pressure to rock strength and Young’s modulus are analyzed. The results show that both axial compressive strength and Young’s modulus increase linearly as the confining pressure increases, and the red sandstone still meet Coulomb criterion. Through regression analysis, the cohesion of red sandstone is 12.7 MPa, and the internal friction angle is 30.4°. The rock failure form is related to confining pressure.

Key words: frozen rock, freezing triaxial test, axial compressive strength, Young’s modulus, negative temperature