Development of a dynamic model for a cone bolt

St-Pierre, Luc; Hassani, Ferri; Radziszewski, Peter; Ouellet, J.

doi:10.1016/j.ijrmms.2008.05.005

Cited by 62 publications

(33 citation statements)

References 10 publications

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“…The first concept of such a bolt, the so-called "cone bolt" was proposed in South Africa in the early 1990s [10]. The "cone bolt" was modified later for resin grout in Canada [1]. Another bolts which have variable geometry along entire length are: "Durabar" [11], "D" 5], "CTw" [12].…”

Section: Energy-absorbing Boltsmentioning

confidence: 99%

“…At such levels, the rock mass can be highly stressed causing an increase in the severity and frequency of rock bursts. The rejected rock mass can reach velocities between 3 and 10m/s with corresponding energy levels varying from 10 to 50kJ/m 2 [1]. Mining supports must be adapted to the natural hazards, especially rock bursts, whose intensification will be increasing with the increase in depth of exploitation [2,3].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Energy-absorbing Boltsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Skrzypkowski

2018

E3S Web Conf.

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“…Wang et al [11,12] presented a numerical analysis approach for buried structures subjected to blast load. Chen and Zhao [13] modeled the propagation of blast wave in jointed rock masses and mesh size influence was analyzed. It should be noted that these works only investigated the underground structure or rock mass without rock support.…”

Section: Introductionmentioning

confidence: 99%

Dynamic behavior of cement-mortar cavern reinforced by bars

Wang

Tang

et al. 2015

Engineering Failure Analysis

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“…Therefore, the study of in situ behavior of this support system under dynamic loading is necessary. Studies done so far for the design and analysis of fully grouted rockbolts under dynamic loading are generally laboratorial, of which one can refer to the experimental works of Otuonye [1], Littlejohn [2], Yi and Kaiser [3], Xu [4], Ansell [5,6] and St-Pierre et al [7], Li [8]. Li and Doucet [9] recently introduced a type of yielding rockbolt which is named D-bolt.…”

Section: Introductionmentioning

confidence: 99%

“…Considering the high cost and many restrictions of laboratorial experiments, numerical methods are viable tools to study the complex mechanisms involved in rockbolt behavior. In this respect some works has been conducted by Ansell [5] and St-Pierre [7] to understand the energy absorbing and cone rockbolts. In these studies, except for the in situ experiments, the surrounding rock mass confinement effect was not studied and it was assumed that the dynamic load is exerted as a sudden impact to the head plate, which merely has application in the simulation of especial case of rock burst at deep underground openings.…”

Section: Introductionmentioning

confidence: 99%