Analytic Study on the Force Transfer of Full Encapsulating Rock Bolts Subjected to Tensile Force

Author:

Chen Jianhang12,Zhao Yiqiang1,Zhao Hongbao1,Zhang Junwen1ORCID,Zhang Cun1,Li Danqi3

Affiliation:

1. School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, P. R. China

2. International Joint Research Laboratory of Henan Province for Underground Space Development and Disaster Prevention, Henan Polytechnic University, Jiaozuo 454003, P. R. China

3. WA School of Mines: Minerals, Energy and Chemical Engineering, Curtin University, Kalgoorlie, WA 6430, Australia

Abstract

Full encapsulating rock bolts are widely used in mining and civil engineering to keep the stability of underground excavations. Nevertheless, decoupling at the interface between the bolt and grout (first interface) still occurs. To disclose the loading mechanism of the bolting system and preventing decoupling at the first interface, experimental and analytic studies were conducted in this paper. First, a nonlinear shearing-slipping law is used to describe the coupling and decoupling behavior of the first interface. Then, this shearing-slipping law is merged into the anchorage body. Following this, the whole loading process is divided into two components: elastic period and elastic-plastic period. Consequently, the analytic force-deformation relation of bolts is obtained. To confirm the rationality of this solution, experimental tensile tests on bolts were performed. It shows that there was a good match between analytic results and experimental tests. With the confirmed analytic solution, a parameter study is performed to investigate the impact of shearing-slipping parameters on the bolting performance. It indicates that increasing the shearing strength of the first interface and the shearing slipping have a positive impact in improving the bearing capacity of bolts. Inversely, the softening coefficient for the post-failure stage has a negative impact on determining the bearing capacity of bolts. Overall, the shearing strength of the first interface has a major impact in determining the loading performance of bolts.

Funder

national natural science foundation of china

yue qi distinguished scholar project

beijing municipal natural science foundation

fundamental research funds for the central universities

Publisher

World Scientific Pub Co Pte Ltd

Subject

Mechanical Engineering,Mechanics of Materials,General Materials Science

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