基于应变测量的煤吸水膨胀变形特征实验研究
Experimental Study on Deformation Characteristics of Coal Water Absorption Expansion Based on Strain Measurement
-
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。Abstract: 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.
-
-
[1] 郭志飚,王炯,邓小卫,等.深部软岩巷道围岩吸水后抗压强度变化规律研究[J].煤炭科学技术,2015,43(3):40-42. [2] 周翠英,谭祥韶,邓毅梅,等.特殊软岩软化的微观机制研究[J].岩石力学与工程学报,2005,24(3):394. [3] 郭志飚,李乾,王炯.深部软岩巷道锚网索-桁架耦合支护技术及其工程应用[J].岩石力学与工程学报,2009,28(S2):3914-3919. [4] 吕强,陈方明.亭南煤矿软岩巷道底鼓机理及控制对策[J].煤炭工程,2011(12):22-24. [5] 朱术云,宋淑光,孙强,等.不同试验条件下深部下组煤底板水岩相互作用特征[J].岩石力学与工程学报,2014(s1):3231-3237. [6] 李志强.表面含氧官能团对提质褐煤吸水特性的影响[D].太原:太原理工大学,2014. [7] Heggheim T, Madland M V, Risnes R, et al. A chemical induced enhanced weakening of chalk by seawater[J]. Journal of Petroleum Science & Engineering, 2005, 46(3): 171-184. [8] 甄浩.有压水源下煤吸水性能的研究及分析[J].矿冶,2015,24(6):34-36. [9] 崔金榜,汪伟英,张承洲,等.煤岩水敏性机理研究防治[J].石油化工高等学校学报,2015,28(2):54-57. [10] 马春德,徐纪成,叶青,等.竹节式高精度岩石自由膨胀率测定装置的研制[C]∥2014海峡两岸破坏科学与材料试验学术会议暨全国mts材料试验学术会议论文集.北京:中国力学学会,2014. [11] 左清军,吴立,袁青,等.软板岩膨胀特性试验及微观机制分析[J].岩土力学,2014(4):986-990. [12] 朱训国,杨庆.膨胀岩的判别与分类标准[J].岩土力学,2009,30(S2):174-177. [13] 何沛田,张仕光.岩石膨胀特性和机理研究[C]∥中国岩石力学与工程学会第六次学术大会论文集. 武汉:中科院武汉岩石力学所,2000. [14] 邱良军,李慧芝.岩石自由膨胀率试验分析[J].铁道勘察,2014(3):74-75. [15] 何沛田,吴相超,黄志鹏,等.岩石膨胀特性和机理研究[J].采矿与安全工程学报,2005,22(3):52-54. [16] 闫好奎,任建国.电阻应变片的工作原理[J].计量与测试技术,2013,40(4):12-12. -
期刊类型引用(0)
其他类型引用(3)
计量
- 文章访问数: 133
- HTML全文浏览量: 0
- PDF下载量: 0
- 被引次数: 3
下载:
