采矿与安全工程学报 ›› 2014, Vol. 31 ›› Issue (5): 819-823.

• 论文 • 上一篇    下一篇

瓦斯放散过程中煤样力学特性演化试验研究

  

  1. 1.中国矿业大学(北京)资源与安全工程学院,煤炭资源与安全开采国家重点实验室,北京 100083;2.中国煤炭工业协会生产力促进中心,北京 100713
  • 出版日期:2014-09-15 发布日期:2014-10-08
  • 作者简介:赵洪宝(1980—),男,山东省武城县人,博士,副教授,从事岩石力学与瓦斯灾害预测与防治方面的研究。 E-mail:hongbaozhao@126.com Tel:010-62339050
  • 基金资助:

    国家自然科学基金项目(51004110);煤炭资源与安全开采国家重点实验室开放基金项目(SKLCRSM13KFB11);中央高校基本科研业务费专项基金项目(2009QZ03)

Evolution law of coal mechanical properties in gas emission process

  • Online:2014-09-15 Published:2014-10-08

摘要: 以处于固定应力环境中的含不同压力瓦斯的煤样瓦斯放散过程为研究对象,以瓦斯逐渐放散过程中煤样的轴向应变、横向应变为研究参数,系统地研究了瓦斯逐渐放散过程中煤样的变形特性与规律。结果表明:在一定外力环境下,煤样逐渐放散瓦斯后其轴向应变、横向应变变化均表现为一个明显的非线性过程;轴向应变变化规律呈三段式,存在一个瓦斯放散速度点使煤样轴向应变开始以较大速率增加,瓦斯放散速度与产生的轴向应变可用改进的乘幂关系表征;横向应变变化规律呈明显的非线性;试验结束时,随着瓦斯压力的增加煤样产生的总横向应变也呈明显的非线性;瓦斯压力大小对于瓦斯放散过程中煤样产生的轴向应变、横向应变均有明显影响,主要表现为开始出现应变处对瓦斯放散速度的敏感性、产生变形总量和产生变形过程与瓦斯放散速度的关联性等方面。

关键词: 瓦斯放散, 瓦斯压力, 应变, 耦合方程

Abstract: In this paper, taking gas emission process of coal containing different pressure gas in fixed-stress environment as the research object, and taking the axial and transverse strains in gas emission process as study parameters, the coal sample deformation law in gas emission process was studied systematically. The results show that in a certain external stress environment, the evolution law of both the axial strain and transverse strain in gas emission process present obvious nonlinear characteristics. The axial strain of coal sample law presents three-step style, and there exits one point of gas emission speed make the axial strain start to increase in a larger rate, while the relationship between gas emission speed and axial strain can be expressed by improved power function The total transverse strain also shows obvious nonlinear characteristics at the end of experiment. The size of gas pressure has obvious effect on axial strain and transverse strain in process of gas emission,which mainly is manifested in the sensitivity between strain appear point and gas emission speed, and the correlation between total strain, strain formation process, and gas emission speed, etc.

Key words: gas emission, gas pressure, strain, coupling equation