An analytical model for axial performance of rock bolts under constant confining pressure based on continuously yielding criterion

Published on Jul 1, 2021in Tunnelling and Underground Space Technology4.45
· DOI :10.1016/J.TUST.2021.103955
Danqi Li5
Estimated H-index: 5
(Colorado School of Mines),
Yingchun Li12
Estimated H-index: 12
(DUT: Dalian University of Technology)
+ 1 AuthorsHossein Masoumi11
Estimated H-index: 11
(Monash University)
Source
Abstract
Abstract An analytical model is developed to simulate the load-displacement performance of rock bolts under axial loading based on Modified Continuously Yielding Criterion. Such a model accounts for various surface geometries of rock bolt as well as the various confining pressures at the rock bolt to the grout interface which play significant roles in the behaviour of grouted rock bolts under axial loading. Majority of the defined parameters in the model can be measured within the laboratory environment. The proposed model is validated against the experimental results obtained from FRP and HA25 rock bolts. The good agreement between the experimental results and the analytical predictions highlights the ability of the proposed model to simulate the full load-displacement behaviour of rock bolts under axial loading.
References33
Newest
#1Qingyuan He (CUMT: China University of Mining and Technology)H-Index: 7
#2Yingchun Li (DUT: Dalian University of Technology)H-Index: 12
Last. Chengguo Zhang (UNSW: University of New South Wales)H-Index: 12
view all 4 authors...
Abstract Coal pillars are usually loaded under combined compression-shear stresses at underground coal mines. Their long-term stability is critical to the utilization of underground structures, such as underground reservoirs at coal mines. In this study, a modified rock property testing system was used to explore the mechanical properties of coal specimens under quasi-static combined compression-shear loading conditions. The acoustic emission technique was applied to investigating the microcrack...
6 CitationsSource
#1Danqi LiH-Index: 5
#2Yingchun Li (DUT: Dalian University of Technology)H-Index: 12
Last. Wancheng Zhu (Northeastern University (China))H-Index: 31
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The application of cable bolts tends to increase in both underground mining operations and civil tunnel excavations have given its outstanding performance to support the excavation surface and hence minimise the hazards and risk of failure in the field. Understanding the mechanical behaviour of cable bolts under axial loading subjected to different field environment from analytical perspective is essential and economic for selecting the most appropriate cable bolt for a specific scenario and als...
4 CitationsSource
#1Qingyuan He (CUMT: China University of Mining and Technology)H-Index: 7
#2Yingchun Li (DUT: Dalian University of Technology)H-Index: 12
Last. Chengguo Zhang (UNSW: University of New South Wales)H-Index: 12
view all 4 authors...
Mechanical responses of rocks to combined compression and shear have attracted increasing attention but still lack comprehensive understanding. Sixty-eight laboratory tests are conducted on basalt and granite specimens sourced from different origins to generalize the effects of specimen inclination on the mechanical properties of igneous rocks. A novel regression model is established to predict peak strength and elastic moduli of igneous specimens at various inclination angles. The model mechani...
23 CitationsSource
#1Danqi Li (UNSW: University of New South Wales)H-Index: 5
#2Hossein Masoumi (Monash University)H-Index: 11
Last. Mostafa AsadizadehH-Index: 6
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The laboratory short encapsulation pull-out test (LSEPT) has been widely accepted as the most efficient method to characterize the mechanical behaviour of cable bolts under axial loading. In this s...
8 CitationsSource
#1Danqi Li (UNSW: University of New South Wales)H-Index: 5
#2Hossein Masoumi (Monash University)H-Index: 11
Last. Serkan Saydam (UNSW: University of New South Wales)H-Index: 14
view all 4 authors...
Abstract This study aims to experimentally and analytically investigate the behaviour of two different cable bolts, including Sumo and TG using an advanced pull-out testing facility capable of testing the cable bolts under axial loading and constant normal stiffness. The quantitative contribution of a range of parameters (e.g. uniaxial compressive strengths of grout and confining medium and the borehole diameter) on the overall behaviour of Sumo and TG cable bolts was examined based on Analysis ...
11 CitationsSource
#1Danqi Li (UNSW: University of New South Wales)H-Index: 5
#2Hossein Masoumi (UNSW: University of New South Wales)H-Index: 11
Last. Paul C. Hagan (UNSW: University of New South Wales)H-Index: 16
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A wide range of modified cable bolts are currently used for ground support in different conditions in Australian underground coal mining operations. This is mainly based on the belief that the performance of modified cable bolts is better than conventional cable bolts. Despite this positive view, very few studies have characterised the performance of modified cable bolts in service. A new laboratory-based pull-out testing facility was employed in this study to investigate the behaviour of two di...
10 CitationsSource
#1Isabelle Thenevin (PSL Research University)H-Index: 1
#2Laura Blanco-Martín (PSL Research University)H-Index: 3
Last. Aleksander WranaH-Index: 5
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Abstract Laboratory pull-out tests were conducted on the following rock bolts and cable bolts: steel rebars, smooth steel bars, fiberglass reinforced polymer threaded bolts, flexible cable bolts, IR5/IN special cable bolts and Mini-cage cable bolts. The diameter of the tested bolts was between 16 mm and 26 mm. The bolts were grouted in a sandstone sample using resin or cement grouts. The tests were conducted under either constant radial stiffness or constant confining pressure boundary condition...
34 CitationsSource
#1Danqi Li (UNSW: University of New South Wales)H-Index: 5
#2Hossein Masoumi (UNSW: University of New South Wales)H-Index: 11
Last. Paul C. Hagan (UNSW: University of New South Wales)H-Index: 16
view all 4 authors...
Abstract Cable bolts are extensively used in mining and civil structures as one of the most important support systems for ground control. In order to design an effective support system, understanding the performance of cable bolts under the conditions other than those tested in the laboratory is essential. Thus, this paper outlines the development of a constitutive model that can predict the full load-displacement performance of the modified cable bolts at different confining pressures. The mode...
18 CitationsSource
#1Jianhang Chen (UNSW: University of New South Wales)H-Index: 5
#2Paul C. Hagan (UNSW: University of New South Wales)H-Index: 16
Last. Serkan Saydam (UNSW: University of New South Wales)H-Index: 14
view all 3 authors...
To enable a better understanding of the load transfer performance of fully grouted cable bolts, a new laboratory short encapsulation pull test (LSEPT) unit has been designed and constructed. With this unit, both peak and residual capacity can be assessed over a relatively large pull-out displacement range of 100 mm. Various cable bolt failure modes, including relative slippage along the cable/grout and grout/rock interface, can be studied. Both a modified and a plain strand cable bolt confined i...
25 CitationsSource
#1Yingchun Li (UNSW: University of New South Wales)H-Index: 12
#2Joung Oh (UNSW: University of New South Wales)H-Index: 13
Last. Bruce Hebblewhite (UNSW: University of New South Wales)H-Index: 19
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Abstract This paper presents a joint constitutive model that considers separately the mechanical contribution of waviness and unevenness of a joint to shear behaviour. The critical asperities for waviness and unevenness are determined from geometric properties in a lab-scale joint. The wear process is employed to model the degradation in dilation and strength during shear. From dimensional analysis, asperity degradation constants are developed using geometric parameters including asperity angle,...
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Cited By2
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#1Jianhang Chen (CUMT: China University of Mining and Technology)H-Index: 2
#2Peng Liu (CUMT: China University of Mining and Technology)H-Index: 1
Last. Zhang Junwen (CUMT: China University of Mining and Technology)H-Index: 2
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Abstract null null Fully encapsulated rock bolts are widely used in keeping the stability of underground openings and slopes. However, bonding failure at the bolt/grout (B/G) interface still occurs. Thus, a theoretical solution was proposed to investigate the rock bolting performance. The coupling and decoupling behaviour of the B/G interface is simulated with a bonding-slipping formula. The feasibility of this bonding-slipping formula was confirmed with physical experiments on rock bolts. Then,...
3 CitationsSource
#1Danqi Li (Colorado School of Mines)H-Index: 5
#2Ming Cai (Laurentian University)H-Index: 39
Last. Hossein Masoumi (Monash University)H-Index: 11
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Abstract null null This study presents a novel constitutive model to characterise the mechanical behaviour of cable bolts under axial loading and subjected to different boundary conditions including constant confining pressure and constant normal stiffness. Such a model is developed based on the modified Mohr-Coulomb failure criterion as well as a newly proposed non-linear dilation formulae for the development of governing equations. The cone shaped failure mode of grout due to the axial movemen...
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