Influence of Radial Stiffness of Surrounding Rock on Dynamic Behaviour of End-anchored Rockbolt under Impact Loading

Xingzhong Wu; Yubao Zhang; Zijian Zhang; Minglu Xing; Jianye Fu; Longhai Li; Pengfei Liu

doi:10.1590/1679-78258137

Influence of Radial Stiffness of Surrounding Rock on Dynamic Behaviour of End-anchored Rockbolt under Impact Loading

Authors

Xingzhong Wu College of Energy and Mining Engineering https://orcid.org/0009-0006-9534-6152
Yubao Zhang College of Energy and Mining Engineering https://orcid.org/0000-0002-1235-1348
Zijian Zhang College of Energy and Mining Engineering https://orcid.org/0000-0002-2735-3549
Minglu Xing College of Energy and Mining Engineering https://orcid.org/0009-0005-5726-1126
Jianye Fu College of Energy and Mining Engineering https://orcid.org/0009-0000-2606-2515
Longhai Li College of Energy and Mining Engineering https://orcid.org/0009-0008-0186-1650
Pengfei Liu Ningxia Hongdunzi Coal Industry Co.

DOI:

https://doi.org/10.1590/1679-78258137

Abstract

The surrounding rock stiffness has a significant effect on the impact mechanical properties of rockbolts. In order to study the influence of radial stiffness of surrounding rock on the dynamic characteristics of the end-anchored rockbolt, numerical simulations of drop weight impact tests on the end-anchored rockbolt were conducted using finite element method. The simulation results show that the larger the radial stiffness of the surrounding rock, the larger the value of the absorbed impact energy of end-anchored rockbolt. However, there is an upper limit to the effect of radial stiffness on the dynamic behavior of end-anchored rockbolt, i.e., the value of absorbed impact energy tends to be stabilized when the radial stiffness exceeds 2.91 GPa/mm. In the impact simulation, the fracture position of the bolt bar is affected by both radial stiffness and impact energy. The greater the radial stiffness of the surrounding rock, the further the fracture location is away from the anchorage end. The larger the impact energy is, the closer the fracture location is to the anchorage end. It is important to study and determine the range of fracture location of anchor rods to develop new types of anchor rods and to design the support scheme for the surrounding rock under dynamic loading. Finally, due to the linkage between numerical simulation and indoor tests, the effect of steel pipe wall thickness on the upper and lower limits of the results also provides a theoretical basis for the rationalization of the design of steel pipe wall thickness. The study of dynamic impact fracture location of bolt bar is of great significance for the development and design of new types of rockbolt under dynamic loading.

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Published

2024-08-20

Issue

Vol. 21 No. 9 (2024)

Section

Articles

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