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冰川冻土 ›› 2018, Vol. 40 ›› Issue (1): 79-85.doi: 10.7522/j.issn.1000-0240.2018.0010

• 寒区科学与技术 • 上一篇    下一篇

低温含水砂岩动态压缩力学性能试验研究

张欢1, 平琦1,2, 吴明静1   

  1. 1. 安徽理工大学 矿山地下工程教育部工程研究中心, 安徽 淮南 232001;
    2. 安徽理工大学 煤矿安全高效开采省部共建教育部重点实验室, 安徽 淮南 232001
  • 收稿日期:2017-07-18 修回日期:2018-01-09 出版日期:2018-02-25 发布日期:2018-04-13
  • 通讯作者: 平琦,E-mail:qping@aust.edu.cn E-mail:qping@aust.edu.cn
  • 作者简介:张欢(1992-),女,湖北武汉人,2015年在湖北工程学院获学士学位,现为安徽理工大学在读硕士研究生,从事岩石动力学研究.E-mail:austzh@126.com
  • 基金资助:
    国家自然科学基金项目(51674008);安徽省博士后基金资助项目(2015B058);安徽高校省级自然科学研究重点项目(KJ2013A085)资助

Experimental study on dynamic compressive mechanical properties of sandstone with low temperature and natural water content

ZHANG Huan1, PING Qi1,2, WU Mingjing1   

  1. 1. Ministry of Education's Engineering Research Center of Mine Underground Projects, Anhui University of Science and Technology, Huainan, Anhui 232001, China;
    2. Key Laboratory Being Built by Anhui Province and Ministry of Education for Coal Mine Safety and Efficient Exploitation, Anhui University of Science and Technology, Huainan, Anhui 232001, China
  • Received:2017-07-18 Revised:2018-01-09 Online:2018-02-25 Published:2018-04-13

摘要: 为研究砂岩动态压缩力学性能,采用SHPB装置对低温含水砂岩试样进行6种不同加载速率的冲击压缩试验。结果表明:-10℃时砂岩动态抗压强度和弹性模量明显大于-15℃时,动态抗压强度与应变率均呈乘幂关系增长;动态弹性模量与应变率呈正相关性,-10℃和-15℃时均呈多项式关系;动态应力-应变曲线分为4个阶段,应变软化阶段的应变范围随应变率的增加而增大;砂岩试样破坏模式随着应变率的增加,由块状劈裂结构、片状层裂结构的拉伸破坏,转变为锥形体结构的剪切破坏,最终呈现颗粒状粉碎破坏。

关键词: 岩石动力学, 低温, SHPB, 动态强度, 应变率效应

Abstract: In order to study the dynamic mechanical properties of sandstone, impact compression tests were performed on low temperature and natural water content sandstone specimens under 6 kinds of loading rate by split Hopkinson pressure bar (SHPB) apparatus. The results show that the dynamic compressive strength and the elastic modulus of the sandstone at -10℃ is greater than that at -15℃, the dynamic compressive strength increases in a power function with the strain rate. The dynamic elastic modulus is positively related to the strain rate and in a polynomial function both at -10℃ and -15℃. The dynamic stress-strain curve is able to divide into 4 stages and the strain range in the strain softening stage increases with the increase of strain rate. Failure modes of sandstone specimens range from tensile failure modes in block splitting structure and lamellar spallation structure to shear failure modes in cone structure until to crushing failure modes in granular structure with the increase of strain rate.

Key words: rock dynamics, low temperature, SHPB, dynamic strength, strain rate effect

中图分类号: 

  • TU45