煤厚变异区开采冲击地压发生的力学机制 (1)

㊀第41卷第7期煤㊀㊀炭㊀㊀学㊀㊀报

Vol.41㊀No.7㊀㊀2016年

7月

JOURNAL OF CHINA COAL SOCIETY

July㊀

2016㊀

赵同彬,郭伟耀,谭云亮,等.煤厚变异区开采冲击地压发生的力学机制[J].煤炭学报,2016,41(7):1659-1666.doi:10.13225/ki.jccs.2015.1475

Zhao Tongbin,Guo Weiyao,Tan Yunliang,et al.Mechanics mechanism of rock burst caused by mining in the variable region of coal thick-ness[J].Journal of China Coal Society,2016,41(7):1659-1666.doi:10.13225/ki.jccs.2015.1475

煤厚变异区开采冲击地压发生的力学机制

赵同彬1,2,郭伟耀1,2,谭云亮1,2,张㊀泽1,2,程康康1,2

(1.山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地,山东青岛㊀266590;2.山东科技大学矿业与安全工程学院,山东青岛㊀266590)

摘㊀要:针对地质构造区域煤层开采容易发生冲击地压的情况,建立了煤岩组合体力学模型,研究了煤厚变化对超前支承压力分布特征和能量演化规律的影响,揭示了煤厚变异区煤层开采冲击地压发生的力学机制㊂研究表明:煤厚变薄区的原岩应力比变厚区大,煤厚减小率或岩煤弹性模量比越大,应力变化梯度越大;工作面由厚向薄回采,超前支承压力呈 双峰值 分布,而工作面由薄向厚回采,超前支承压力呈 单峰值 分布;冲击地压发生时,工作面由厚向薄回采,第2峰值应力区内形成高能区会阻碍能量向煤壁深部传递,产生的冲击能量将主要向巷道或工作面临空面释放,而工作面由薄向厚回采,冲击能量可向煤壁深部转移,冲击影响范围小㊂现场案例分析及工程实践表明,工作面由薄向厚回采更有利于防冲㊂关键词:冲击地压;煤厚变异;机制;能量传递

中图分类号:TD324．1㊀㊀㊀文献标志码:A㊀㊀㊀文章编号:0253-9993(2016)07-1659-08

收稿日期:2015-10-12㊀㊀修回日期:2016-02-28㊀㊀责任编辑:许书阁

㊀㊀基金项目:国家自然科学基金资助项目(51474136,51474137);泰山学者优势特色学科人才团队支持计划资助项目

㊀㊀作者简介:赵同彬(1975 ),男,黑龙江齐齐哈尔人,副教授,博士生导师㊂E -mail:ztbwh2001@㊂通讯作者:郭伟耀(1990 ),男,山

西朔州人,博士研究生㊂E -mail:363216782@

Mechanics mechanism of rock burst caused by mining in the variable

region of coal thickness

ZHAO Tong-bin 1,2,GUO Wei-yao 1,2,TAN Yun-liang 1,2,ZHANG Ze 1,2,CHENG Kang-kang 1,2

(1.State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology ,Shandong University of Science and Technology ,Qingdao ㊀266590,China ;2.School of Mining and Safety Engineering ,Shandong University of Science and Technology ,

Qingdao ㊀266590,China )

Abstract :Rock burst is prone to easily occur during mining in the geological structural area.Thus,the mechanical model of coal-rock combination is established,the influences of coal thickness variation on the distribution characteris-tics of abutment pressure and the evolution law of impact energy are studied,and the rock burst s mechanism of min-

ing in the variable region of coal thickness is revealed.Results show that the in-situ stress in the thinning area is larger than that in the thickening area,and the stress gradient increases with the increase of coal thickness reduction rate or elastic modulus ratio between rock and coal.When mining from thick to thin seam,the abutment pressure shows a double peak distribution,but when mining from thin to thick seam,the abutment pressure shows a single peak distribution.When mining from thick to thin seam,the high-energy area formed by the second peak stress area will hin-der the energy from transmitting into the deep coal wall,which will cause the impact energy mainly release into road-ways or working faces,but when mining from thin to thick seam,the impact energy can transmit into the deep coal wall,and the disaster s influencing scope is small.Field case analysis and field application show that mining from thin