Pullout Performances of Grouted Rockbolt Systems with Bond Defects

Chang, Xu; Wang, Shanyong; Wang, Shuren; Fu, Lei; Tang, Chun’an

doi:10.1007/s00603-017-1373-1

Cited by 28 publications

(15 citation statements)

References 28 publications

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“…The bond behavior can be modeled by cohesive elements (Qiao and Chen 2008;Lu and Xu 2013;Chang et al 2017;Xu et al 2018;Park et al 2015) or surface-based cohesive behavior (Chen et al 2011;Henriques et al 2013Henriques et al , 2015Yang et al 2017) using traction-separation law in Abaqus. Because the interface thickness is negligibly small, the interface bond behavior between rockbolt (concrete) and cement mortar was modeled by the surface based cohesive behavior in order to reduce the calculation time.…”

Section: Spectrum Analysismentioning

confidence: 99%

Experimental and numerical evaluation on debonding of fully grouted rockbolt under pull-out loading

Zhu

Niu

2022

Int J Coal Sci Technol

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The axial loading in rockbolts changes due to stress redistribution and rheology in the country rock mass. Such a change may lead to debonding at rockbolt to grout interface or rupture of the rockbolt. In this study, based on laboratory experiments, ultrasonic guided wave propagation in fully grouted rockbolt under different pull-out loads was investigated in order to examine the resultant debonding of rockbolt. The signals obtained from the ultrasonic monitoring during the pull-out test were processed using wavelet multi-scale analysis and frequency spectrum analysis, the signal amplitude and the amplitude ratio (Q) of low frequency to high frequency were defined to quantify the debonding of rockbolt. In addition to the laboratory test, numerical simulation on the effect of the embedment lengths on ultrasonic guided wave propagation in rockbolt was conducted by using a damage-based model, and the debonding between rockbolt and cement mortar was numerically examined. It was confirmed that the ultrasonic guided wave propagation in rockbolt was very sensitive to the debonding because of pull-out load, therefore, the critical bond length could be calculated based on the propagation of guided wave in the grouted rockbolt. In time domain, the signal amplitude in rockbolt increased with pull-out load from 0 to 100 kN until the completely debonding, thus quantifying the debonding under the different pull-out loads. In the frequency domain, as the Q value increased, the debonding length of rockbolt decreased exponentially. The numerical results confirmed that the guided wave propagation in the fully grouted rockbolt was effective in detecting and quantifying the debonding of rockbolt under pull-out load.

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Section: Spectrum Analysismentioning

confidence: 99%

Experimental and numerical evaluation on debonding of fully grouted rockbolt under pull-out loading

Zhu

Niu

2022

Int J Coal Sci Technol

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“…In terms of a performance study of anchor bolts, mechanical test, numerical simulation, and non-destructive test are three common research methods. Conventional mechanical tests generally include tensile test (Chang et al, 2017), pull-out test (Teymen and Kılıç, 2018;Xu et al, 2018), shear test , shaking table test (Su et al, 2021), the drop hammer test, and the Split Hopkinson Pressure Bar test (Wu et al, 2019;Wang et al, 2022). Those tests include comparatively accurate mechanical properties such as tensile strength, elongation, and shear strength.…”

Section: Research Methods Of Anchor Boltsmentioning

confidence: 99%

Progress and Perspectives of Geotechnical Anchor Bolts on Slope Engineering in China

Li²,

Chicas³

et al. 2022

Front. Environ. Sci.

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Geotechnical anchoring technology is an important tool for disaster prevention and mitigation in slope engineering. Anchor bolts which are commonly used in slope engineering can be divided into prestressed anchors and non-prestressed anchors. Due to the superiority of anchor support technology, research on various aspects of anchor bolts, such as mechanical mechanism, anchorage effect, and the development of new-type anchor bolts, has been a significant research topic for scholars. This mini-review sums up the diverse past and current literature on anchor support technology of slope engineering in China. It focuses on the characteristics, applications, research methods, and practical cases of anchor bolts and briefly describes the history of slope anchor bolt development in China in the past 3 decades. Nowadays, the demand for engineering construction processes is increasing, and engineering geological conditions are becoming more complex, which promotes the development of anchor support technology. At the international level, achieving carbon neutrality is both an international trend and a general objective. Against the background of global commitment to carbon neutrality, the potential future perspectives for the developments of anchor support technology have been prospected in light of actual engineering needs.

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“…The finite element software Abaqus (2014) has often been applied for numerical simulation of the debonding behaviors (Zima and Rucka 2017;Qiao and Chen 2008;Lu and Xu 2013;Chang et al 2017;Xu et al 2018;Chen et al 2011;Henriques et al 2013Henriques et al , 2015Yang et al 2017) and non-destructive testing Rucka 2017, 2018) of grouted rockbolt system. In this section, grouted rockbolt system were simulated by four-node bilinear axisymmetric quadrilateral elements with reduced integration (CAX4R) (Fig.…”

Section: Numerical Model Of Grouted Rockbolt Systemmentioning

confidence: 99%

Experimental and numerical evaluation on debonding of fully grouted rockbolt under pull-out loading

Zhu

Niu

2021

Preprint

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The axial loading in rockbolts changes due to stress redistribution and rheology in the country rock mass. Such a change may lead to debonding at rockbolt to grout interface or rupture of the rockbolt. In this study, based on laboratory experiments, ultrasonic guided wave propagation in fully grouted rockbolt under different pull-out loads was investigated in order to examine the resultant debonding of rockbolt. The signals obtained from the ultrasonic monitoring during the pull-out test were processed using wavelet multi-scale analysis and frequency spectrum analysis, the signal amplitude and the amplitude ratio (Q) of low frequency to high frequency were defined to quantify the debonding of rockbolt. In addition to the laboratory test, numerical simulation on the effect of the embedment lengths on ultrasonic guided wave propagation in rockbolt was conducted by using a damage-based model, and the debonding between rockbolt and cement mortar was numerically examined. It was confirmed that the ultrasonic guided wave propagation in rockbolt was very sensitive to the debonding because of pull-out load, therefore, the critical bond length could be calculated based on the propagation of guided wave in the grouted rockbolt. In time domain, the signal amplitude in rockbolt increased with pull-out load from 0 kN to 100 kN until the completely debonding, thus quantifying the debonding under the different pull-out loads. In the frequency domain, as the Q value increased, the debonding length of rockbolt decreased exponentially. The numerical results confirmed that the guided wave propagation in the fully grouted rockbolt was effective in detecting and quantifying the debonding of rockbolt under pull-out load.

show abstract

Pullout Performances of Grouted Rockbolt Systems with Bond Defects

Cited by 28 publications

References 28 publications

Experimental and numerical evaluation on debonding of fully grouted rockbolt under pull-out loading

Experimental and numerical evaluation on debonding of fully grouted rockbolt under pull-out loading

Progress and Perspectives of Geotechnical Anchor Bolts on Slope Engineering in China

Experimental and numerical evaluation on debonding of fully grouted rockbolt under pull-out loading

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