Experimental study on the mechanical properties of lumpy rock mass under bolt reinforcement

被引：0
作者：
Zhu W. [1 ,2 ]
Jing H. [1 ]
Zhang L. [1 ]
Chen M. [1 ]
Su H. [1 ]
机构：
[1] State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou, 221116, Jiangsu
[2] School of Traffic and Civil Engineering, Shandong Jiaotong University, Jinan, 250357, Shandong
来源：
Jing, Hongwen (hwjing@cumt.edu.cn) | 2018年 / China University of Mining and Technology卷 / 35期
关键词：
Anchoring mode; Bolt axial force; Failure feature; Lumpy rock mass; Strength;
D O I：
10.13545/j.cnki.jmse.2018.02.005
中图分类号：
学科分类号：
摘要：
Taking a unit of surrounding rock mass as the research object, through developing a set of similar materials and loading molds, compressive tests on cube samples with the side length of 200 mm are performed to study the influence of block size and anchoring patterns on the mechanical behaviors of rock mass. The test results show that: when the block size is larger, the bonding performance between the bolt and rock mass is stronger and the bolt can play a better supporting role; when the bedding surface spacing is increased, both the peak strength and the elastic modulus of the rock mass present a gradually increasing trend. Compared with the end anchorage, both the extended anchorage and the full anchorage can further improve the bonding ability between the bolt and rock mass and inhibit the phenomenon of de-anchoring and increase the support effects. With increasing the anchorage length, both peak strength and elastic modulus of the rock mass can increase gradually. The research findings can provide a certain theoretical basis to the rockbolt support design and warning forecast of destabilizing destruction for broken surrounding rock incoal seam roadways. © 2018, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.
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页码：261 / 266and290
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