Application of bolt-grouting reinforcement for broken surrounding rock based on prestressed bolt and self-stress grouting

被引：0
|
作者：
Zhang J. [1 ,2 ]
Liu L. [2 ]
Liu C. [1 ]
Sun D. [3 ]
Shao J. [3 ]
机构：
[1] College of Water Conservancy and Civil Engineering, Shandong Agricultural University, Tai'an
[2] College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao
[3] China Coal Technology Engineering Group Chongqing Research Institute, Chongqing
来源：
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2021年 / 38卷 / 04期
关键词：
Application effect; High-stress broken surrounding rock; Instability mechanism; Prestressed anchor; Self-stress slurry;
D O I：
10.13545/j.cnki.jmse.2020.0207
中图分类号：
学科分类号：
摘要：
In view of the poor control effect of bolt-grouting caused by self-shrinkage of cement-based grouting materials and low anchoring force of grouting anchor in the surrounding rock of high-stress roadway, the bolt-grouting reinforcement method for broken surrounding rock based on prestressed bolt and self-stress grouting was proposed. With substation roadway in Pingmei No.10 Mine as the engineering background, based on the analysis of instability mechanism of original support method, the principle of self-stress slurry reinforcement for fractured rock mass was explored, a new high-strength prestressed grouting-bolt system was developed, and a bolt-grouting support scheme for broken surrounding rock based on prestressed bolt and self-stress grouting was formed. The engineering application effect of this new prestressed bolt-grouting was comprehensively analyzed through SEM scanning of the slurry-rock interface, borehole televiewer of surrounding rock, stress of bolt (cable) and surrounding rock deformation. The results have shown that the axial restraint stress of the high-prestressed grouting bolts and the expansion stress of the self-stress slurry make the reinforced surrounding rock in a quasi-3D stress state, which realizes the strengthening and repair of broken surrounding rock. The new high-strength prestressed grouting-bolt has the advantages of large prestress, more standard application of prestress, high anchoring force and high strength of the bolt-rod, so it can provide higher axial restraint. After the new bolt-grouting reinforcement, the grouting veins fill the surrounding rock cracks, and the slurry stone is tightly combined with the rock mass. The force of grouting-bolt (cable) was stable, and the maximum displacement of the roadway surrounding rock was 83 mm. It shows that the stability control of the surrounding rock of the substation roadway is achieved through the new prestressed bolt-grouting support scheme. © 2021, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.
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页码：774 / 783
页数：9
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