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2015-12-19 · The RSF leads to more reliable judgment of rock bolting capability of a given rock mass than the QRSF since it uses five parameters of discontinuity conditions while the QRSF uses only two parameters. Journal. Bulletin of Engineering Geology and the Environment – Springer Journals. Published: Dec 19, 2015
Get PriceRock bolts are a type of drilled soil nail or anchor used when the ground to be stabilized consists mostly of rock materials. These types of inclusions are typically grouted in place and posttensioned, similar to soil anchors (Figure 15.8).The bolts hold potentially unstable jointed or fractured rock masses together in compression with bearing faceplates providing passive resistance, forming a ...
Get Price2017-6-1 · Tieback bolting is usually used to reinforce rock pillars. With tieback bolting, the bolts, usually equally spaced, go through the entire width of the pillar and are pre-tensioned with a relatively high load (see Fig. 22). It should be noted that the purpose of tieback bolting is not to enhance the peak strength of the pillar to avoid failure but to prevent the pillar from disintegration in the post-failure stage.
Get Price2009-8-14 · As the bolting pattern suggested by RMR (Rock Mass Rating) and Q-system depends only on the rock mass quality, some significant critics have recently arisen. Palmström and Broch (2006) and Pells and Bertuzzi (2008) have agreed that the “well-known Q-support chart gives only indication of the support to be applied, and it should be tempered by sound and practical engineering judgement”.
Get Price2014-9-1 · Rock bolting is one of the most commonly used ground support systems in the mining industry. The conventional design practice of underground supports with rock bolts has been mainly based on static loading and a more-or-less rigid rock-bolt support system . However, it has been frequently observed that rock excavations are subject to dynamic loading due to various seismic events induced by blasting, rock strata caving, stress redistribution, earthquakes, rock …
Get PriceStillborg, B. (1994) Professional Users Handbook for Rock Bolting. Trans Tech Publication, Aedermannsdorf, 164 p. has been cited by the following article: TITLE: Rock Mass Characterization and Support Design for Underground Additional Surge Pool Cavern—A Case Study, India
Get Price2017-1-1 · With the Enduro™ bolt Mine C was able to accept a less than 100% encapsulation with traditional resin anchors due to its effective resistance to corrosion. Implementing this system also eliminated manual handling issues and exposure to cement dust encountered while using the previous post grouting system.
Get Price2021-6-30 · Rock Mechanics and Rock Engineering publishes original research on the experimental and theoretical aspects of rock mechanics, including laboratory and field testing, computational methods, design principles and site investigation. Coverage also includes case histories on design and construction of structures in rock and review papers.
Get Price2016-3-25 · the truss-bolt system in reinforcing underground frac-tured rock roofs in coal mines. Carranza-Torres12 pro-posed the method of quantifying the mechanical contribution of rock bolts installed systematically around tunnels. Reinforcement of the effects of using rock bolt on rock mass with cross-flaws was explored
Get Price2021-1-25 · Fig. 1 lists some examples of the gloving problem in a coal mine in Huainan city, Anhui province, P. R. China. All of the bolting systems had failed and then were collected from the underground entries/roadways. As seen, the gloving insulated direct adhesion between the bolt and borehole wall, and in this way, the reinforcing effects of the bolting system were evidently limited.
Get Price2020-9-18 · This paper presents a unified supporting parameter optimization procedure for the coupled bolt-rock systems by using the orthogonal experimental methods. Convergence of surrounding rock surface and deformations in the rock are taken as the objective functions for the stability of the surrounding rock of the roadway. The key support parameters of the bolt are considered as input …
Get Price2016-2-3 · Read 'Failure mechanism of bolting support and high-strength bolt-grouting technology for deep and soft surrounding rock with high stress, Journal of Central South University of Technology' on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
Get Price2009-3-8 · Study on the new shell bolting and shotcrete support and its application in soft rock tunnels Study on the new shell bolting and shotcrete support and its application in soft rock tunnels Yao, Chuan-qin 2009-03-08 00:00:00 A new kind of tunnel support was put forward on the basis of the anchor spray support principle. The mechanics of the new three-dimensional steel bar shotcrete lining ...
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Get Price2016-2-3 · Read 'Failure mechanism of bolting support and high-strength bolt-grouting technology for deep and soft surrounding rock with high stress, Journal of Central South University of Technology' on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
Get Price2014-5-19 · Rock material properties play an important role in assessing rock mass behaviour. Passive rock bolts stabilize a rock mass by restricting relative displacements; however, they may reduce rock material properties. While assessing properties of rock mass reinforced by rock bolts, the alteration caused in rock material properties due to drilling and bolting operation should be well understood.
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