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冰川冻土 ›› 2014, Vol. 36 ›› Issue (3): 632-639.doi: 10.7522/j.issn.1000-0240.2014.0076

• 寒区科学与技术 • 上一篇    下一篇

冻融循环作用下花岗斑岩和灰岩物理力学性质对比分析及应用研究

闻磊1,2, 李夕兵1, 尹彦波1,2, 高栗1   

  1. 1. 中南大学 资源与安全工程学院, 湖南 长沙 410083;
    2. 长沙矿山研究院有限责任公司, 湖南 长沙 410012
  • 收稿日期:2014-01-09 修回日期:2014-03-14 出版日期:2014-06-25 发布日期:2014-07-16
  • 作者简介:闻磊(1983-),男,河北保定人,2009年在河北大学获硕士学位,现为中南大学博士研究生,主要从事矿山岩石力学研究.E-mail:WL0921@126.com
  • 基金资助:
    国家重点基础研究发展计划(973计划)项目(2012CB724207)资助

Study of physico-mechanical properties of granite porphyry and limestone in slopes of open-pit metal mine under freezing-thawing cycles and their application

WEN Lei1,2, LI Xibing1, YIN Yanbo1,2, GAO Li1   

  1. 1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;
    2. Changsha Institute of Mining Research Co., Ltd, Changsha 410012, China
  • Received:2014-01-09 Revised:2014-03-14 Online:2014-06-25 Published:2014-07-16

摘要: 以花岗斑岩和灰岩两种岩性岩石为代表,实验研究了冻融作用下,岩石的致密程度、孔隙率等物理指标对岩石物理力学性质的影响. 通过不同次数的冻融循环实验,对花岗斑岩和灰岩2种典型岩石样本的质量、单轴抗压强度、抗拉强度、冻融系数、风化程度的变化规律进行对比分析,并绘出了冻融次数与试样的抗压强度、抗拉强度、冻融系数的拟合关系曲线. 在一定限定条件下,将实验结果应用于西藏玉龙铜矿花岗斑岩、灰岩边坡的具体实例中,采用强度折减法计算出了矿山边坡冻融风化前、后的安全系数,对比分析了花岗斑岩、灰岩边坡受冻融风化的影响程度,为矿山的设计和施工提供了参考.

关键词: 露采金属矿山, 冻融循环, 物理力学特性, 强度折减法, 安全系数

Abstract: Slope stability is greatly affected by freezing-thawing cycles in open-pit mining activities. The rock corers from Tibet Yulong Copper Mine are of granite porphyry and limestone. Properties, uniaxial compressive strength, tensile strength, coefficient of freezing and thawing, rate of decay were determined and calculated by experiment. The relation curve of freezing-thawing cycles and uniaxial compressive strength, tensile strength, coefficient of freezing and thawing are fitted. The experimental results are using in the slopes of the Tibet Yulong Copper Mine. Safety factors of the granite porphyry and limestone slopes before and after freezing-thawing cycles are calculated and compared. The research results are useful for the construction and design of similar projects.

Key words: open-pit metal mine, freeze-thaw cycles, physical and mechanical properties, strength reduction technique, safety factor

中图分类号: 

  • TU45/TD854