>> 自然科学版期刊 >> 2018年04期 >> 正文
不同拉拔速率作用下锚固体力学响应试验研究
供稿: 韦四江;吴怡凡;赵尚宁;李辉辉 时间: 2018-07-18 次数:

作者:韦四江吴怡凡赵尚宁李辉辉

作者单位:‍河南理工大学能源科学与工程学院;煤炭安全生产河南省协同创新中心

摘要:为了研究动态拉拔作用下锚固体的力学响应规律,采用自制的锚固体装置和万能试验机,研究了锚固体在不同拉拔速率下的响应特征。结果表明:随着拉拔速率增大,峰值位移逐渐增加,所对应的峰值拉拔逐渐增大,但增加幅度随加载速率增加而趋缓;拉拔速率一定时,锚固段逐渐向里脱黏破坏,孔壁的粗糙度对峰后的残余黏结力有较大的影响。声发射监测结果表明:声发射次数和能量在接近峰值时开始急剧增加,高振铃次数及高能量事件仅仅在峰值附近出现,峰后流动阶段各试件声发射现象基本一致;破裂次数随着拉拔速率的增加而增大,破裂事件大都从基体上端开始,然后中间、底部交替出现;随着加载速率的增加,破裂事件逐渐向基体底部过渡。针对冲击动载条件下的锚固支护巷道,提出了采用加长锚固、增加孔壁粗糙度和提高锚固剂的密实度等措施。

基金:国家自然科学基金资助项目(U1304517;51374091);

关键词:锚固体;拉拔速率;力学响应;破坏特征;

Abstract:In order to explore the mechanics response law of anchorage body under dynamic loading, by means of anchorage device made in laboratory and universal testing machine, mechanics response characteristics of anchorage body under different pullout out rates was researched. The results show that, displacement and strength on peak point increases with increasing of pullout rate, but the increase range slows with the loading rate increasing. When pullout rate is a fixed value, there is deboned failure on anchorage segment from bore top to bottom, and roughness of bore wall has great impact on residual cohesion. Monitoring of acoustic emission show that, ring counts and energy of acoustic emission begin to increase sharply nearby peak point, and high ring counts and energy events only appear near peak point. Phenomena of acoustic emission of all specimens on the flat stage are similar. Numbers and energy of cracks increase with pullout rate increasing. Mostly failure events happen from bore top to its bottom, or alternately. With the increasing of pullout velocity, failure events transfer from bore top to its bottom gradually. According to the roadway of rock burst, extended anchorage, higher roughness of bore wall and higher density of resign are good to the control of adjacent rock.

DOI:10.16186/j.cnki.1673-9787.2018.04.3

分类号:TD353

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