夹矸厚度对煤矸互层顶板工作面矿压显现影响研究  

Effect of gangue thickness on mine pressure behavior of working face with interbedded coal gangue roof

作　　者：伍永平[1,2] 刘旺海 解盘石[1,2] 杨文斌 刘晨光 WU Yong-ping;LIU Wang-hai;XIE Pan-shi;YANG Wen-bin;LIU Cen-guang(School of Energy Engineering,Xi'an University of Science and Technology,Xi'an,Shanxi 710054,China;MOE.Key Laboratory of Western Mime Exploitation and Haard Prevention,Xi'an Univensity of Science and Techuology,Xi'an 710054,China)

机构地区：[1]西安科技大学能源学院,陕西西安710054 [2]西安科技大学西部矿井开采及灾害防治教育部重点实验室,陕西西安710054

出　　处：《煤炭工程》2020年第10期75-80,共6页Coal Engineering

基　　金：国家自然科学基金重点项目(51634007);国家自然科学基金面上资助项目(51974227);陕西省教育厅专项科学研究计划项目(19JK0520)。

摘　　要：夹矸顶板的稳定性控制是煤矸互层顶板工作面安全开采亟待解决的关键技术问题之一。为了弄清夹矸厚度对煤矸互层顶板工作面矿压显现的影响,采用物理相似模拟实验方法研究了不同夹矸厚度条件下工作面顶板的变形破坏运移规律、支承压力分布特征等。研究结果表明,夹矸层厚度较薄时,开采后夹矸层垮落比较破碎;夹矸层厚度较厚时,夹矸层垮落块度较大,随夹矸层厚度的增加架前冒顶的次数依次减少,工作面处顶板垮落角依次增大。无夹矸层阶段,周期性垮落步距为14.7m;有夹矸层阶段,随夹矸层厚度的增加来压步距由12.3m增大至15.8m。支承压力峰值和影响范围随夹矸层厚度的增加而增大,支承压力峰值距工作面的距离随夹矸层厚度的增加而减小。提出了带压擦顶移架和浅截深护等夹矸顶板稳定性控制措施,保证煤矸互层顶板工作面安全开采。The stability control of gangue roof is one of the key technologies to be solved urgently in the safe mining under interbedded coal gangue roof.In order to find out the influence of gangue thickness on mine pressure behavior of interbedded coal gangue roof face,physical similar simulation is used to study the deformation and migration laws of the subsurface roof and the distribution characteristics of supporting pressure under different gangue thickness conditions.The results show that when the thickness of the gangue layer is thin,the collapse of the gangue layer is more fragmented after mining.When the thickness of the gangue layer is thick,the collapse fragmentation of the gangue layer is larger.With the increase of the thickness of the gangue layer,the number of roof caving before the support decreases in turn,and the roof caving angle at the working face increases in turn.In the stage without gangue layer,the periodic caving interval is 14.7 m;in the stage with gangue layer,the pressing step distance increases from 12.3 m to 15.8 m with the increase of the thickness of gangue layer.The peak abutment pressure and influence range increase with the increase of the thickness of the gangue layer,and the distance between the peak abutment pressure and the working face decreases with the increase of the thickness of the gangue layer.The stability control measures of gangue layer roof,such as advancing support with contacting roof to control the stability of gangue roof and shallow truncation and deep protection,are put forward to ensure the safe mining under interbedded coal gangue roof.

关 键 词：夹矸厚度 煤矸互层 支承压力 物理相似模拟 

分 类 号：TD323[矿业工程—矿井建设]