Experimental study on synergistic anchoring effect of preload bolt

被引：0
|
作者：
Long J. [1 ,2 ]
Liu Y. [3 ]
Cao Z. [4 ]
Fan Z. [5 ]
Liu B. [6 ]
Yang J. [1 ]
机构：
[1] School of Architecture and Design, China University of Mining & Technology, Xuzhou, 221116, Jiangsu
[2] State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou, 221116, Jiangsu
[3] Xuhai College, China University of Mining & Technology, Xuzhou, 221008, Jiangsu
[4] Guizhou Administrator of Coal Mine Safety, Guiyang, 550004, Guizhou
[5] Juji Coal Mine, Henan Yongcheng Energy Co Ltd, Yongcheng, 476600, Henan
[6] Guizhou Panjiang Investment Holdings (Group) Co Ltd, Guiyang, 550003, Guizhou
来源：
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2019年 / 36卷 / 04期
关键词：
Bolt; Preload; Synergistic effects; Synergistic increment;
D O I：
10.13545/j.cnki.jmse.2019.04.007
中图分类号：
学科分类号：
摘要：
To investigate the synergistic effects of preload bolt, some experimental testing specimens were made. With different preloads, the stress value and distribution characteristics at different measuring points in anchorage section with a single bolt, double bolts and multiple bolts were tested. The existence of synergistic effects was verified in the experiment. Meanwhile, synergistic effects evaluation method was developed with the proposal of synergistic increment and its calculation formula. Results shows that the stress value at different locations of anchorage body rises with the increase in bolt preloading. Stress distribution indicates a linear attenuation with one single bolt, while a non-linear attenuation with two or multiple bolts. For the latter, specifically, synergistic effect occurs in a certain range of anchorage section, and the synergistic increment is over zero. As a result, synergistic effects could help to improve the stress status of anchorage, as well as its strength, stiffness, bearing capacity and defor mation-resistance capacity. © 2019, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.
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页码：696 / 705
页数：9
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