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[1]曹有勋,马衍坤,毛小艺,等.松软煤层多孔爆破的裂纹分布及区域电阻率响应实验研究*[J].中国安全生产科学技术,2020,16(10):71-77.[doi:10.11731/j.issn.1673-193x.2020.10.011]
　CAO Youxun,MA Yankun,MAO Xiaoyi,et al.Experimental study on crack distribution and regional electrical resistivity response of soft coal seams after multihole blasting[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2020,16(10):71-77.[doi:10.11731/j.issn.1673-193x.2020.10.011]
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松软煤层多孔爆破的裂纹分布及区域电阻率响应实验研究*
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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10期
页码:
71-77
栏目:
职业安全卫生管理与技术
出版日期:
2020-10-30

文章信息/Info

Title:
Experimental study on crack distribution and regional electrical resistivity response of soft coal seams after multihole blasting
文章编号:
1673-193X(2020)-10-0071-07
作者:
曹有勋; 马衍坤; 毛小艺; 杨涛; 王杨
（1.鄂托克前旗长城六号矿业有限公司，内蒙古 鄂托克前旗 016200；
2.安徽理工大学 深部煤矿采动响应与灾害防控国家重点实验室，安徽 淮南 232001）
Author(s):
CAO Youxun;  MA Yankun;  MAO Xiaoyi;  YANG Tao;  WANG Yang
(1.Etuoke Qianqi Great Wall No.6 Mining Co.,Ltd.,Etuoke Qianqi Inner Mongolia 016200,China;
2.State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines,Anhui University of Science and Technology,Huainan Anhui 232001,China)
关键词:
松软煤层; 深孔爆破; 电阻率; 控制孔
Keywords:
soft coal seam;  deep hole blasting;  electrical resistivity;  control hole
分类号:
X936；TD315
DOI:
10.11731/j.issn.1673-193x.2020.10.011
文献标志码:
A
摘要:
为获得松软煤层多孔爆破的裂纹分布及区域电阻率响应特征，利用岩体和煤体的三层物理模型，开展松软煤层多孔模型爆破实验，借助图像处理与电阻率层析成像技术，分析松软煤层多孔爆破的裂纹分布特征，得出爆破前后电阻率的响应规律。结果表明：在爆生裂隙形成的同时，控制孔内侧煤体呈现出断裂式和非断裂式2种位移现象，部分抵消了爆破孔扩腔带来的挤压作用；提出采用爆生裂隙、控制孔及爆破孔面积变化三者的综合值（S）分析爆破效果，单孔爆破时，S＜0，煤层裂隙分形维数变化率仅5%，控制区域呈现压实现象，电阻率降低约20%；多孔爆破时，爆生裂隙丰富、煤体发生充分位移，裂隙分形维数变化率达到21.28%，爆破孔空腔的负效应被抵消（S＞0），控制区域内电阻率普遍增大1~30倍；与单孔爆破模型相比，多孔爆破更符合煤矿现场，且能有效实现控制区域内的增透，电阻率普遍呈现增大现象。
Abstract:
In order to obtain the crack distribution and regional electrical resistivity response characteristics of soft coal seams after the multihole blasting,the blasting experiments on the multihole model of soft coal seams were carried out by using the threelayer physical model of rock mass and coal mass.The crack distribution characteristics of soft coal seams after the multihole blasting were analyzed by using the image processing and electrical resistivity tomography (ERT) techniques,and the response laws of electrical resistivity before and after the blasting were obtained.The results showed that at the same time of forming the blastinginduced cracks,the coal mass inside the control holes presented two kinds of displacement phenomena: crack and noncrack,partially offsetting the extrusion effect caused by the expansion of blasting hole.The comprehensive value (S) of area change of blastinginduced cracks,control holes and blasting holes was proposed to analyze blasting effect.When the singlehole blasting was performed,S<0,the fractal dimension change rate of coal seam cracks was only 5%,the control area presented the compaction phenomenon,and the electrical resistivity decreased by about 20%.When the multihole blasting was performed,the blastinginduced cracks were abundant and the coal mass displaced sufficiently.The fractal dimension change rate of cracks reached 21.28%,the negative effect of blasting hole cavity should be offset (S>0),and the electrical resistivity in the controlled area generally increased by 1 to 30 times.Compared with the singlehole blasting model,the multihole blasting was more in line with the coal mine site,and it can effectively increase the permeability in the control area,and the electrical resistivity generally increased.

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备注/Memo

备注/Memo:
收稿日期： 2020-05-12；网络首发日期： 2020-10-23
* 基金项目： 国家重点研发计划项目（2018YFC0808000）
作者简介： 曹有勋，硕士，工程师，主要研究方向为煤岩动力灾害防治。
通信作者： 马衍坤，博士，副教授，主要研究方向为煤岩动力灾害防治。
更新日期/Last Update: 2020-11-21