Development of a novel energy-absorbing bolt with extraordinarily large elongation and constant resistance

He, Manchao; Gong, Weili; Wang, Jiong; Qi, Peng; Tao, Zhigang; Du, Shanshan; Peng, Yanyan

doi:10.1016/j.ijrmms.2014.01.007

Cited by 347 publications

(144 citation statements)

References 19 publications

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“…In actual fact, they combine advantages of the three abovementioned groups. Basic objective of their development is to design such an anchoring system providing high bearing capacity in terms of large deformations (He et al, 2014;Wen, Jiang, Han, Yang, & Wang, 2016).…”

Section: Introductionmentioning

confidence: 99%

Studies of new nonadhesive anchoring

Sakhno¹,

Sakhno²,

Kurdiumow³

et al. 2018

Min. miner. depos.

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Purpose is to develop anchoring with nonadhesive high-strength roof bolting in terms of large pre-destructive deformations and its testing under laboratory conditions.Methods. Laboratory studies of hydration hardening of self-extending mixtures, carried out with the use of digital microscope Bresser LCD 40-1600x, have determined the features of hydration of the modified mixtures. The developed mixture, testing by means of unevenly-component three-axial pressure (UCTAP), has determined its strength within post-hydration period, elasticity module, and deformation module. Bench tests concerning anchor fastening by means of self-expending mixtures as well as anchor glue Cement KL have helped perform comparative analysis of adhesive technique to hold anchors fixed and nonadhesive one. Underground on-site research to fasten anchors while Franciszek Karol chamber strengthening in the context of Wieliczka mine made it possible to determine dynamics of anchor loading.Findings. It has been grounded experimentally that adding of Sika BV 3M ingredient to self-extending mixture results in up to 30% intensification of its strength limit on uniaxial compression. It has also been grounded experimentally that maximum effort to fasten anchor bolts by means of self-extending mixtures, excesses efforts for those bolts fastened with the help of resins more than twice. Analysis of operation mode of such anchors means that the action of anchor -fastener -rock system is close to that by modern energy absorbing bolts. Originality.A new concept of anchor fixation at the expense of their fastening by means of self-extending mixtures throughout the hole length has been formulated. During the hardening process, 30 -50 MPa pressure is developed making it possible to intensify maximum fastening effort being more than two times higher to compare with adhesive technique. Moreover, constant resistance is provided in the process of the anchor bolts displacement within a hole; the resistance is similar to that provided by adhesive technique. Practical implications.The obtained results, having sufficient practical accuracy, can be used for the development of new anchoring in the context of large deformations of a stope boundary. If the parameters are substantiated theoretically and bench testing is passed, the proposed anchoring technique can be implemented in the stopes of coal mines, ore mines as well as nonmetallic ones. That favours the increase in load bearing capacity of the anchorage and rock support in terms of their elastic deformation.

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Section: Introductionmentioning

confidence: 99%

Studies of new nonadhesive anchoring

Sakhno¹,

Sakhno²,

Kurdiumow³

et al. 2018

Min. miner. depos.

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“…According to the monitoring principle of sliding forces and the working principle of CRLD bolts, [22][23][24][25][26] we developed a landslide monitoring and warning system on the basis of sliding force changes ( Figure 14).…”

Section: Stability Analysis Of All Conditions For Slopesmentioning

confidence: 99%

Slope stability evaluation and monitoring of Tonglushan ancient copper mine relics

Tao

Zhu

Zheng

et al. 2018

Advances in Mechanical Engineering

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Due to natural environmental conditions and the effect of man, geological disasters (landslides, earthquakes, etc.) pose a serious threat to ancient relics distributed across China. In consideration of the current situation at the Tonglushan ancient copper mine relics, and on the basis of hydrology and geological engineering conditions of ancient relics, major factors affecting slope stability of ancient relics are analyzed. In light of major working condition types in the slopes of ancient relics, slope stability in relation to earthquakes and rainfall is analyzed using GeoStudio software with limit equilibrium methods. Results indicate that, with sustained rainfall, all slopes in the current reinforcement measure maintain a suitable stabilization status, but slope stability will sharply decline in response to an earthquake. Therefore, the influence of mining blasting activities on slope stability is analyzed. In view of the deformation characteristics of ancient copper mines, the sliding force remote monitoring and warning system based on the constant resistance and large deformation anchor bolt is adopted to continuously monitor the stability of the west slope of the relics. Monitoring results show that the application of ''mechanical gun'' instead of ''explosive blasting'' mining technique in the open-pit mine has effectively reduced the influence of mining disturbance on the stability of the western slope. As slope deformation of the relics can be effectively monitored and controlled, our findings provide a theoretical basis to analyze slope stability in other similar cultural relics.

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“…"Dynatork" [15], "Yiel-Lok" [16] or inside the borehole (the so-called absorber), e.g. "Roofex" [17], "Garford" [18], "He" [19], "DAP" [20]. A few of those bolts schematics which are available so far are briefly presented on the Fig.…”

Section: Energy-absorbing Boltsmentioning

confidence: 99%

Laboratory testing of a long expansion rock bolt support for energy-absorbing applications

Skrzypkowski

2018

E3S Web Conf.

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Abstract. The main purpose of rock support and reinforcement in underground mining is to maintain excavations safe and open for their intended lifespan. The basic type of rock mass reinforcement method both in ore and hard coal mining is rock bolt support. Very often, existing bolt support systems are not always capable of providing a reliable controlled performance. Therefore, in recent years energy-absorbing bolts which are exposed to dynamic loading, for example from rock burst caused by high rock stresses, earthquakes, or blasting have appeared. In this article particular attention was paid to short and long expansion bolts. Quasi-static tests of expansion bolts were carried out at the laboratory test facility in simulated mining conditions, especially for the KGHM Po mines. In the underground mines of the Legnica-(LGOM) the main way to protect the room excavation is rock bolt support with a length from 1.2 m to 2.6 m. Rock bolt support longer than 2.6 m is considered as additional support of excavations and is increasingly being used to reinforce the roofs. The comparisons of energy-absorbing short and long expansion bolts with a length of 1.8m, 3.6m and 5.2m were presented. In addition, for elastic and plastic range of each bolts were determined.

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Development of a novel energy-absorbing bolt with extraordinarily large elongation and constant resistance

Cited by 347 publications

References 19 publications

Studies of new nonadhesive anchoring

Studies of new nonadhesive anchoring

Slope stability evaluation and monitoring of Tonglushan ancient copper mine relics

Laboratory testing of a long expansion rock bolt support for energy-absorbing applications

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