摘要
通过对数值模拟获得的锚杆索预紧力在巷道煤岩体中预应力分布特征的统计分析,拟合得到了单体锚杆索预应力影响半径R_(P)与锚杆索预紧力P和预应力加固拱效应指标σ_(P)三者间的理论拟合关系公式,基于该理论拟合公式对三元煤业3号煤层回采巷道锚杆支护参数进行了优化设计,并开展了现场工业性试验。研究结果表明:锚杆和锚索的预应力影响半径R_(P)与其预紧力P和加固拱效应指标σ_(P)的负幂指数呈正相关,锚杆支护参数优化后的回采巷道,在掘进期间和工作面回采期间,无论是锚杆索的工作阻力,还是巷道围岩的深浅部离层和表面位移,均与原支护方案相差不大,未发生影响工作面正常生产的事件,优化支护方案提高了回采巷道的掘支效率,降低了掘支材料和人力的投入,达到了低密度支护目标,提产增效显著,验证了实用理论公式设计锚杆支护参数的合理性和有效性,为类似条件下煤矿锚杆支护参数设计提供了可借鉴的实用理论计算方法。
Through the statistical analysis of the ground pretension stress induced by rockbolt pretension obtained by numerical simulation,a practical formula was obtained by data fitting method.Rockbolting for roadway of Sanyuan Coal Mine was desgined based on the presented formula,and its effectivness was verified in a field test.The results showed that,the pretension stress influence radius R_(P) of single rockbolt or cable was positively related to its pretension force P and the negative power index of reinforced arch effect index σ_(P).During the roadway excavation and mining of the working face,not only the axial force of rockbolt and cable but also the roof separation displacement and the surrounding rock deformation were almost the same compared to that of unoptimized roadway.And there were no events affecting the normal production of the working face.The tunneling efficiency was improved,and the investment of support materials and manpower were reduced by introducing the optimized rockbolting support.It had achieved the goal of low density support.The rationality and effectiveness of the rockbolting design by the practical theoretical formula was verified.It could provide a practical theoretical calculation method for the design of rockbolting in coal mines under similar conditions.
作者
张庆国
赵红星
袁爽
赵宝友
ZHANG Qing-guo;ZHAO Hong-xing;YUAN Shuang;ZHAO Bao-you(Shanxi Sanyuan Coal Industry Co.,Ltd.,Changzhi 046000,China;School of Mechanics and Engineering,Liaoning Technical University,Fuxin 123000,China)
出处
《煤炭工程》
北大核心
2022年第8期30-36,共7页
Coal Engineering
基金
国家自然科学基金项目(52174116)。
关键词
锚杆支护参数
预紧力
预应力
加固拱
rockbolting parameters
pretension force
pre-stress
reinforcement arch
作者简介
张庆国(1989-),男,山西长治人,工程师,主要从事煤矿生产与技术管理工作,E-mail:404204013@qq.com。
