采矿与安全工程学报 ›› 2012, Vol. 29 ›› Issue (4): 511-515.

• 论文 • 上一篇    下一篇

煤样抗压、拉强度与点荷载指标关系的试验研究

  

  1. 1.河南理工大学能源科学与工程学院,河南  焦作  454000 2.河南理工大学安全科学与工程学院,河南  焦作  454000
  • 收稿日期:2011-07-20 出版日期:2012-07-15 发布日期:2012-05-23
  • 作者简介:苏承东(1961-),男,陕西省佛坪县人,教授级高级工程师,从事采矿工程和岩石力学方面的研究。 E-mail:sucd@hpu.edu.cn Tel:0391-3986261
  • 基金资助:

    国家自然科学基金项目(40902044;50974054)

Study on Correlation among Point Load Strength, Compression and Tensile Strength of Coal Samples

  • Received:2011-07-20 Online:2012-07-15 Published:2012-05-23

摘要: 通过对漳村煤矿3#煤层煤样进行单轴压缩、巴西劈裂、捣碎法以及点荷载试验,对试验结果进行分析。结果表明:捣碎、巴西劈裂、单轴压缩和点荷载试验结果的离散程度依次增大;非规则试样与规则试样相比,点荷载试验结果的离散程度明显偏大,规则试样平行层理与垂直层理加载方式得到的点荷载强度结果大致相同;煤样的坚固性系数、单轴抗压强度、抗拉强度与点荷载强度具有关联性,能够实现相互转换得到相应参数,转换后的强度参数可为煤体强度分级指标的确定提供了依据。

关键词: 岩石力学, 煤样, 点荷载试验, 强度, 转换系数, 离散系数

Abstract: A series of uniaxial compression test, Brazilian test, crushing compression test and point load test on coal samples from Zhangcun mine 3# coal seam were carried out. The results show that the dispersion degree increases by the following order: Brazilian test, uniaxial compression test, and point load test. After the irregular samples compared to the regular samples,the dispersion degree of point load test is obviously too large. Among all those regular samples, the point load strengths are roughly the same by parallel bedding and vertical bedding loading methods. There is a correlation among the Protodyakonov's coefficient, uniaxial compression strength, tensile strength and point load strength of the coal samples, which could obtains relevant parameters by their interconversion, and the conversion strength can be used as a reference of coal classification strength index.

Key words:  rock mechanics, coal sample, point load test, strength, conversion coefficient, dispersion coefficient