摘要
自由膨胀率是煤岩膨胀性判定的一项重要指标,考虑到千分尺间接测量存在操作要求高、时间长等缺点,采用应变测量方法对煤吸水膨胀应变进行了测试研究。研究表明:应变测量具有可靠性强、灵敏度高、自动获取数据等优点,可以直接获得煤岩的自由膨胀率;煤吸水膨胀变形应变全过程可以分成初始压应变作用、拉应变急剧上升、拉应变缓慢增大3个阶段;煤试样轴向拉应变比环向拉应变大1‰左右,数值上两者相差不大,水沿层理方向渗透速率快,层理对煤吸水膨胀影响较大。
The free expansion rate is an important indicator for determining the expansion characters of coal. Considering the disadvantages of high operational requirements and long time for indirect measurement of micrometers, the strain measurement method was used to test the expansion strain of coal water absorption. The research shows that: the strain measurement has the advantages of high reliability, high sensitivity, automatic data acquisition, etc., and can directly obtain the free expansion rate of coal;the whole process of coal water expansion deformation strain can be divided into initial compressive strain, rapid rise of tensile strain, and slow increase of tensile strain;axial tensile strain of coal specimen is about 1‰ larger than that of circumferential strain, and the difference is not large. The penetration rate of water along the bedding direction is fast, and bedding has great influence on water swelling of coal.
作者
解北京
严正
张诗蕾
XIE Beijing;YAN Zheng;ZHANG Shilei(School of Resource and Safely Engineering, China Unirersity of Mining & Technology (Beijing), Beijing 100083,China)
出处
《煤矿安全》
CAS
北大核心
2019年第2期48-51,56,共5页
Safety in Coal Mines
基金
国家自然科学基金青年科学基金资助项目(51404277)
国家自然科学基金资助项目(51274206)
中央高校基本科研业务费专项资金资助项目(2014QZ05)
关键词
吸水膨胀
应变片
自由膨胀率
变形特征
软岩巷道
water absorption and expansion
strain gauge
free expansion rate
deformation characteristics
soft roadway
