[1]孙得志①,杨永康①,郭俊庆①,等.煤层坚硬顶板爆破裂纹的扩展规律[J].爆破器材,2022,51(04):58-64.[doi:10.3969/j.issn.1001-8352.2022.04.010]
　SUN Dezhi,YANG Yongkang,GUO Junqing,et al.Propagation Law of Blasting Crack in Hard Roof of Coal Seam[J].EXPLOSIVE MATERIALS,2022,51(04):58-64.[doi:10.3969/j.issn.1001-8352.2022.04.010]
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煤层坚硬顶板爆破裂纹的扩展规律()
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《爆破器材》[ISSN:1001-8352/CN:32-1163/TJ]

卷:
51
期数:
2022年04
页码:
58-64
栏目:
爆破技术
出版日期:
2022-07-08

文章信息/Info

Title:
Propagation Law of Blasting Crack in Hard Roof of Coal Seam
文章编号:
5685
作者:
孙得志①; 杨永康①; 郭俊庆①; 赵国飞②; 庞宏③; 谢二伟①
①太原理工大学原位改性采矿教育部重点实验室（山西太原,030024）
②山西能源学院安全工程系（山西太原,030600）
③潞安化工集团科学技术研究院（山西长治,046299）
Author(s):
SUN Dezhi①;  YANG Yongkang①;  GUO Junqing①;  ZHAO Guofei②;  PANG Hong③;  XIE Erwei①
①Key Laboratory of Insitu Modified Mining of Ministry of Education, Taiyuan University of Technology (Shanxi Taiyuan, 030024)
②Department of safety engineering, Shanxi Energy Institute (Shanxi Taiyuan, 030600)
③Research Institute of Science and Technology, Lu’an Chemical Industry Group (Shanxi Changzhi, 046299)
关键词:
控制孔; 裂隙扩展; 侧压力系数; 不耦合系数; 孔间距
Keywords:
control hole;  crack propagation;  lateral pressure coefficient;  uncoupling coefficient;  hole spacing
分类号:
TD235
DOI:
10.3969/j.issn.1001-8352.2022.04.010
文献标志码:
A
摘要:
针对煤矿爆破中煤层坚硬顶板外加控制孔后爆破孔与控制孔之间存在裂纹扩展不佳的问题，以永宁煤矿10204巷道沿空留巷为工程背景，利用LS-DYNA动力显示有限元分析软件，研究了含有控制孔时侧压力系数u、不耦合系数r、控制孔与爆破孔间距L对坚硬顶板裂纹扩展的影响规律，并进行了现场验证。研究结果表明：随着侧压力系数的增大，孔间裂纹扩展形态呈现方向性的规律，裂纹数量增多、长度增长;随着不耦合系数的增大，峰值有效应力呈现先增大、后减小的趋势；r=1.67时，峰值有效应力最大，相对于其他不耦合系数时的峰值有效应力高出30%~ 40%。r=1.67时，若u≤1，L的最佳值为500 mm；若u>1，L的最佳值为650 mm。
Abstract:
In coal mine blasting, after the control hole is added to the hard roof of the coal seam, there is a problem of poor crack propagation between the blasting hole and the control hole. In order to solve this problem, taking the gob-side retention of 10204 roadway of Yongning Coal Mine as the engineering background, effects of lateral pressure coefficient u, uncoupling coefficient r and distance between control hole and blasting hole L?on crack propagation were studied by using LS-DYNA dynamic display finite element analysis software, and the field verification was carried out. The results show that with the increase of lateral pressure coefficient, the propagation pattern of inter hole crack presents a directional law, and the number and length of cracks increase. With the increase of the uncoupling coefficient, the peak effective stress firstly increases and then decreases. The peak effective stress reaches the maximum when the uncoupling coefficient is 1.67, which is 30%~ 40% higher than that of other uncoupling coefficients. When r is 1.67, if u≤1, the optimal value of L is 500 mm, and if u >1, the optimum value of L is 650 mm.

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备注/Memo

备注/Memo:
收稿日期：2021-12-01
基金项目：山西省应用基础研究计划面上项目(20210302123148);山西省自然基金青年项目(201901D211452)
第一作者：孙得志（1996-）,男，硕士研究生，主要从事岩土力学和爆破安全技术的科研工作。E-mail:864645429@qq.com
通信作者：杨永康（1983-）,男，副教授，主要从事岩土力学和爆破安全技术教学和科研工作。E-mail:yongkang8396@163.com
更新日期/Last Update: 2022-07-06