News

fully grouted rock bolts: an analytical investigation

Image

A Study of the Load Transfer Behavior of Fully Grouted

Therefore in this paper the authors used an analytical model to study the load transfer behavior of fully grouted rock bolts To confirm the credibility of this analytical model an in situ pull out test was used to validate this model There was a close match between the experimental result and the analytical result Following this a parametric study was conducted with this analytical

Image

‪Zhiye Zhao‬ ‪Google Scholar‬

Fully grouted rock bolts an analytical investigation L He XM An ZY Zhao Rock Mechanics and Rock Engineering 48 3 1181 1196 2015 59 2015 A detailed investigation of block dynamic sliding by the discontinuous deformation analysis Y Ning Z Zhao International Journal for Numerical and Analytical Methods in Geomechanics 2013 59 2013 Geological

Image

Strain Measurement Method of Fully Grouted Rock Bolt in

A fully grouted rock bolt was prepared by using 3D , and strain gauges were installed inside and outside the bolt respectively The evolution law of tensile strain in the fully grouted rock bolt during the fracture propagation process was obtained by uniaxial compression test It was found that the outer strain gauges were greatly affected by the shear deformation of the

Image

Analytical Study of the Mechanical Behavior of Fully

Keywords Bedding rock slopes Fully grouted bolts Analytical approaches Transverse shear resistance Mechanical behavior List of symbols X 1 X 2 X 3 The axial force shear force and bending moment acting at the beam end D 1 D 2 D 3 The axial displacement shear displacement and rotation angle at beam end d ij The displacement along the direction of X i

Image

Fully Grouted Rock Bolts An Analytical Investigation

2015 05 01 nbsp 0183 32 Fully Grouted Rock Bolts An Analytical Investigation Lei He X An Zhiye Zhao Published 1 May 2015 Engineering Rock Mechanics and Rock Engineering This paper analytically investigates the performance of fully grouted rock bolts in typical scenarios including pullout test suspending loosened block and increasing joint aperture respectively

Image

INVESTIGATION OF BOLT MODEL MECHANICS RELATED TO

coupling or through a sliding rock grout bolt interface In many cases however shear response is incorporated indirectly and through the use of a number of mechanistic assumptions This paper will examine these in detail Figure 1 Passive rock bolt support systems a as installed at a tunnel face b as represented in a 2D numerical simulation note shearing behaviour of

Image

Laboratory pull out tests on fully grouted rock bolts and

2017 08 08 nbsp 0183 32 Strain gauges were installed on 14 fully grouted bolts placed in shale roof rock at four mines in Colorado Illinois and Pennsylvania to determine how load was transferred between the bolts and the rock The results of field tests on elastic bolt behavior compared well with previous laboratory work and numerical models The field tests showed that the anchorage

Image

Performance evaluation of fully grouted rock bolt in an

INDOROCK201686 INDOROCK 2016 6th Indian Rock Conference 17 18 June 2016 Performance evaluation of fully grouted rock bolt in an Indian hard rock underground mine Deepanshu R Singh 1 Arvind K

Image

Fully Grouted Rock Bolts An Analytical Investigation

DOI 10 1007 s00603 014 0610 0 Corpus ID 140560065 Fully Grouted Rock Bolts An Analytical Investigation article He2014FullyGR title Fully Grouted Rock Bolts An Analytical Investigation author Lei He and Xinmei An and Zhiye Zhao journal Rock Mechanics and Rock Engineering year 2014 volume 48 pages 1181 1196

Image

A Study on the Failure of Resin End Anchored Springer

2018 11 23 nbsp 0183 32 Mart 237 n et al presented a new analytical approach able to predict the mechanical behavior of fully grouted rock bolts subject to pull out tests Nie et al 2014 developed rock bolt models within the framework of two dimensional discontinuous deformation analysis to study the response of rock bolts under various loads considering four different kinds of rockbolts in

Image

Linear Load Transfer Mechanics of Fully Grouted Roof Bolts

using grouted bolts Failure can take place in the bolt the grout the rock the bolt grout interface or the grout 173 rock interface The type of failure de 173 pends on the chalacteristics of t he sys 173 tem and the material properties of the individual elements Figure 2 shows sev 173 eral possible failure modes of fully

Image

Fully Grouted Rock Bolts An Analytical Investigation

This paper analytically investigates the performance of fully grouted rock bolts in typical scenarios including pullout test suspending loosened block and increasing joint aperture respectively The interface shear stress distribution follows the model proposed by Li and Stillborg Int J Rock Mech Mining Sci 36 1013–1029 1999 while the axial behavior of the bolt shank

Image

An analytical model of fully grouted rock bolts subjected

An analytical model for fully encapsulated rock bolts subjected to tensile load in pull out tests is presented This model is based on the bond slip relationship describing the mechanical interaction at the bolt grout interface The model takes into account the residual shear stress in addition to the complete decoupling mechanisms Formulations are also derived for the load

Image

Analytical model of shear behaviour of a fully grouted

A fully grouted cable bolt is normally loaded at rock joints by a combination of the axial and shear forces causing both axial extension and shear deformation of the cable The proposed analyses presented here attempts to predict the joint shear strength and shear displacement The analyses are based on the statically indeterminate beam theory and some basic findings and

Image

PDF Analysis of un tensioned fully grouted rock bolt A

Load transfer mechanism of fully cement grouted rock Since the steel of the bolt is always stronger and ductile than the conventional grout mix therefore localized failure bolts occurs in the grout and or the rock when the magnitude of Full grouted rock bolts in most of the mines are used as load exceeds their tensile strength This will result in primary as well as secondary

Image

Polymers Free Full Text Investigating the Effects of

According to the results obtained grouting improves the overall shear strength of the rock joints All the grouted samples yielded higher maximum and residual shear strength in comparison with the non grouted joint Grouting resulted in an improvement in the cohesion of all the samples However a fall in friction angle by 5 26 176 in the sample with JRC of nine was observed yet it

Image

PDF Analytical model for fully grouted rock bolts with

Rock bolting is generally being practised to reinforce excavation walls and roofs by minimizing the movement of rock joints This study proposes a new analytical model for the prediction of

Image

Primary Investigation on Equivalent Anchoring Method of

Rock bolts one of the main support structures of the tunnel can improve the stress state and mechanical properties of the surrounding rocks The rock bolts are simulated by bar or beam elements in present numerical calculations for most 2D tunnel models However the methods of simulating rock bolt in three dimensional models are rarely studied Moreover there are too

Image

New Technology for Measuring the In Situ Performance of

fully grouted cable bolts several peaks in load may occur along the bolt length Such an effect was observed experimentally by Bjornfot and Stephansson 7 for rock bolts in very hard blocky rock at the Kiruna Mine in Sweden 1 3 Lateral rock bolt behavior in a discontinuous rock mass A dowel effect occurs when a rock bolt transects a rock

Image

Sparrho A new analytical solution for calculation the

2016 09 21 nbsp 0183 32 Investigations of load transfer between the bolt and grout indicate that the bolt profile shape and spacing play an important role in improving the shear strength between the bolt and the surrounding strata This study proposes a new analytical solution for calculation displacement and shear stress in a fully encapsulated rock bolt in jointed rocks The main

Image

Study on Mechanical Characteristics of Fully Grouted Rock

2017 03 16 nbsp 0183 32 This study establishes an analytical model for the interaction between the bolt and surrounding rock based on the bearing mechanism of fully grouted rock bolts The corresponding controlled differential equation for load transfer is deduced The stress distributions of the anchorage body are obtained by solving the equations A dynamic algorithm for the bolt

Image

Elastic Grout Products amp Suppliers Engineering360

Fully Grouted Rock Bolts An Analytical Investigation Hyett et al 1996 derived the analytical solution for the distribution of displacement and load along an untensioned fully grouted elastic bolt which is activated by either a continuous or discontinuous rock displacement to explain the field observation that the fully grouted Use of Epoxy

Image

The Analytical Approach to Evaluate the Load Displacement

Fully grouted rock bolts are widely used in civil engineering and mining engineering playing a significant role in keeping the stability and safety of excavations In this paper the load transfer mechanism of fully grouted rock bolts was studied with an analytical model A trilinear model was used to depict the bond slip behaviour of the bolt grout interface

Image

Fully Grouted Rock Bolts An Analytical Investigation

Toggle navigation Quicklinks Search this site Contact Sites and opening hours Room Reservation

Image

Fully Grouted Rock Bolts An Analytical Investigation

2015 05 01 nbsp 0183 32 This paper analytically investigates the performance of fully grouted rock bolts in typical scenarios including pullout test suspending loosened block and increasing joint aperture respectively The interface shear stress distribution follows the model proposed by Li and Stillborg Int J Rock Mech Mining Sci 36 1013 1029 1999 while the axial behavior of the bolt shank

Image

Laboratory Investigations on Creep Behavior of Grouted

passive rock bolt is not and needs subsequent rock movement to develop a reactive force The fully grouted passive rock bolts are widely used in the underground mines as they provide adequate support under most conditions and are easier to install than active rock bolts and less expensive Active rock bolts are used as they can limit movement

Image

NIOSHTIC 2 Publications Search 20028265 Investigation

The NIOSH Pittsburgh Research Laboratory PRL continues to investigate the behavior of fully grouted roof bolts in the weak roof rock of PRL s Safety Research Coal Mine SRCM This paper describes the results of three studies 1 a series of 24 pull tests of bolts installed fully grouted and overcored to leave 12 inches of grouted bolt

Image

Zhao Z Google Scholar

Fully grouted rock bolts an analytical investigation L He XM An ZY Zhao Rock Mechanics and Rock Engineering 48 3 1181 1196 2015 59 2015 A detailed investigation of block dynamic sliding by the discontinuous deformation analysis Y Ning Z Zhao International Journal for Numerical and Analytical Methods in Geomechanics 2013 59 2013 Development of

Image

Performance evaluation of fully grouted rock bolt in an

2 Fully Cement grouted rock bolts Fully cement grouting to anchor the rock bolt is one of the oldest method of developed to support the roof of mine

Image

Bibliographies Grouted – Grafiati

2021 06 04 nbsp 0183 32 The second part treats grouted rock bolts and the theoretical focus is on their function and possible failure modes as well as on the degrading processes primarily corrosion that are affecting the rock bolts Subsequently the theory was applied on the Swedish concrete buttress dam Storfinnforsen which is the largest concrete dam in Sweden The dam was