|本期目录/Table of Contents|

[1]李波,吕小权,黄来胜,等.低温作用下煤体细观结构变化及相变致裂实验研究[J].中国安全生产科学技术,2020,16(7):25-29.[doi:10.11731/j.issn.1673-193x.2020.07.004]
　LI Bo,LYU Xiaoquan,HUANG Laisheng,et al.Experimental study on mesostructure change and phasetransforming fracturing of coal under low temperature[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2020,16(7):25-29.[doi:10.11731/j.issn.1673-193x.2020.07.004]
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低温作用下煤体细观结构变化及相变致裂实验研究
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《中国安全生产科学技术》[ISSN:1673-193X/CN:11-5335/TB]

卷:
16
期数:
2020年7期
页码:
25-29
栏目:
学术论著
出版日期:
2020-07-30

文章信息/Info

Title:
Experimental study on mesostructure change and phasetransforming fracturing of coal under low temperature
文章编号:
1673-193X(2020)-07-0025-05
作者:
李波; 吕小权; 黄来胜; 任永婕; 姜蒙生
(1.河南理工大学 安全科学与工程学院，河南 焦作 454000；
2.华北科技学院 河北省矿井灾害防治重点实验室，河北 廊坊 065201；
3.煤炭安全生产与清洁高效利用省部共建协同创新中心，河南 焦作 454000)
Author(s):
LI Bo;  LYU Xiaoquan;  HUANG Laisheng;  REN Yongjie;  JIANG Mengsheng
(1.College of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo Henan 454000,China;
2.Hebei Key Laboratory of Mine Disaster Prevention,North China Institute of Science and Technology,Langfang Hebei 065201,China;
3.State Collaborative Innovation Center of Coal Work Safety and Cleanefficiency Utilization,Jiaozuo Henan 454000,China)
关键词:
低温作用; 细观结构; 显微CT; 裂隙体积
Keywords:
low temperature effect;  meso-structure;  microscopic CT;  fissure volume
分类号:
X936
DOI:
10.11731/j.issn.1673-193x.2020.07.004
文献标志码:
A
摘要:
为了研究低温作用下煤体细观结构演化规律，采用CT扫描不同冻结温度下干燥和饱水煤样细观结构图像，构建三维可视化裂隙模型，探究冻结煤体裂隙演化机理。研究结果表明：随着温度的降低，煤样内部产生的拉应力逐渐增大，加之，冰水相变产生冻胀力，导致煤样内部裂隙网格不断扩展演化；冰水相变产生的冻胀力是饱水煤样和干燥煤样裂隙演化具有差异性的原因，孔隙、裂隙水冰点随着孔隙、裂隙的半径减小而逐渐下降，从而导致壁厚较大的裂隙中水分先行冻结，随着温度的继续降低，壁厚较小的裂隙中水分才发生冻结。
Abstract:
In order to study the evolution laws of meso-structure in coal under low temperature effect,the meso-structure images of dry and saturated coal samples under different freezing temperatures were scanned by using CT,then a three-dimensional visual fracture model was constructed,and the evolution mechanism of fractures in the frozen coal was explored.The results showed that the tensile stress generated in the coal sample increased gradually with the decrease of temperature,in addition,the frost heaving force was produced by the phase transformation of ice-water,which induced the constant extension and evolution of fracture grid in the coal sample.The frost heaving force produced by the phase transformation of ice-water was the reason for the difference of fracture evolution between saturated coal sample and dry coal sample.The freezing points of pore water and fissure water decreased gradually with the decrease of the radii of pore and fissure,which resulted in the advance freezing of water in the fissure with large wall thickness,then the water in the fissure with small wall thickness froze along with the follow-up decrease of temperature.

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备注/Memo

备注/Memo:
收稿日期： 2020-01-22；网络首发日期： 2020-07-24
* 基金项目： 国家自然科学基金项目（51604096，51874125）；华北科技学院河北省矿井灾害防治重点实验室基金项目（KJZH2017K08）
作者简介： 李波，博士，副教授，主要研究方向为煤岩瓦斯动力灾害预测与防治。
更新日期/Last Update: 2020-08-06