...INTERACTION MECHANISM OF YIELDING ROCK BOLT AND MATRIX MASS Yujing Jiang1, 3, *Xuezhen Wu1, 3, Gang Wang3, Bo Li1 and Tomomi Iura2 1Nagasaki University, Graduate School of Engineering 1-14 Bunkyo-machi, Nagasaki, Japan (*Corresponding author: [email protected]) 2Kyushu Shinkansen Construction...

...SHEAR STREGTH ENHANCEMENT OF ROCK MASS DUE TO PASSIVE ROCK BOLTS *L. P. Srivastava and M. Singh Department of Civil Engineering Indian Institute of Technology, Roorkee Roorkee, India - 247667 (*Corresponding author: [email protected]) Innovations in Applied and Theoretical Rock Mechanics Editors...

... extend towards the ground ahead of the tunnel face. Propagation of this zone toward the ground surface results in generation of sinkholes. Reservoir Characterization rock bolt shotcrete 13th international congress stability practical method reservoir geomechanics numerical simulation...

... Abstract The application of rock bolts for the stabilisation of underground openings needs a good understanding of the response of the bolts during rock excavation. The pull-and-shear performance of two types of rock bolts–that is, the fully encapsulated rebar and the D-Bolt–has been studied...

... & Gas rock bolt excavation CJB reservoir geomechanics diversion tunnel jointed rock mass Montreal Reservoir Characterization 13th international congress columnar jointed rock mass mechanical response Situ Investigation columnar jointed basalt rock mass rock mechanics isrm13 tunnel...

... condition rockburst Engineering Upstream Oil & Gas hydropower station anchor cable rock bolt high slope rock mass rock engineering China deformation construction Harmonising Rock Engineering and the Environment Qian & Zhou (eds) © 2012 Taylor & Francis Group, London, ISBN 978-0-415...

... ABSTRACT Light Emitting Deformation Sensor is applied for ground anchors and rock bolts. By adding additional elements to original ground anchors and rock bolts, the new types are capable of showing current axial force in them by color of LED that changes according to magnitude of the force...

... and extra geotechnical drills. Based on the analysis of geotechnical information, appropriate stiffness of support system is selected. Flexible and active support system fit the ground condition at the Leeville underground mine. Rock bolts selection, using characteristics of the ground deformation...

..., and the characteristics of deformation and damage of various roadways were investigated. The common roadway support theories at present were introduced, and special study was carried out on rock bolting theories, in which the intrinsic functions of rock bolts are to control the separation, slippage and opening...

... ABSTRACT The D-Bolt is a rock bolt that absorbs energy through mobilization of the load and deformation capacities of the bolt steel along its entire length. The bolt is made of a smooth steel bar that has a number of integrated anchors evenly or un-evenly spaced along the length of the steel...

...Harmonising Rock Engineering and the Environment Qian & Zhou (eds) © 2012 Taylor & Francis Group, London, ISBN 978-0-415-80444-8 Interpretation of pull-out tests on instrumented rock bolts by means of 3D numerical modelling R. Giot, C. Auvray & A. Giraud LAEGO-ENSG, Vand uvre-lès-Nancy, France B...

... and Metallurgical Engineering, National Technical University, Athens, Greece ABSTRACT: The load distribution along fully grouted rock bolts is evaluated numerically. In order to achieve this, three series of models were prepared using two dimensional and three dimensional finite difference codes. Firstly, plane...

... the excavation, deformation and failure of surrounding rock masses around underground caverns of Jinping hydropoer station I are analyzed by the numerical simulation as well as the internal force of rock bolt and presstress anchor cable. Effect of cracks and joints on deformation and failure of surrounding rock...

... in a highly discontinuous rock mass, for which rock bolt reinforcement was dimensioned using the kinematicaly based criteria. 1 INTRODUCTION Rotational instabilities of rock slopes are generally attributed to the intersection of steeply inclined and gently dipping discontinuities, forming columns...

... mass with rock bolts. The bond between rock mass and grout mixture plays the crucial role in rock mass reinforcement. There is the need for using grout mixtures with lower deformation modulus to achieve gradual load transfer from rock mass to grout mixture and finally to the rock bolt. The structures...

... Upstream Oil & Gas reinforcement ground condition Quantitatively srp 0 strength uniaxial strength equivalent thickness coupling support pattern Reservoir Characterization Thickness public corporation displacement shotcrete rock bolt rock bolt density poor ground condition...

... of the excavated tunnel has to be discretised. Indeed, since no elements exist in the rock mass result planes are required to display the stresses in Figure 1. reservoir simulation rock bolt boundary element method rock mass displacement mesh sequence finite element modeling numerical simulation...

... will be performed to assess the validity of the test and of the experimental measurements. 2 TESTING APPARATUS 2.1 Test structure Figure 1 shows the drop weight installation used for all the tests along with some details about its instrumentation. Each rock bolt to be tested is grouted in a sample tube...

... configurations. Subsurface Corrosion strength Pipeline Corrosion well integrity rebar corrosion rate materials and corrosion Upstream Oil & Gas reinforcement steel strand corrosivity cable bolt test bolt rock bolt king wire flowline corrosion riser corrosion concentration strand...

... of design analyses tailored to comply with the new requirement. The paper provides an example of a design analysis for assumed tunnel conditions using a numerical model. Dynamic predictions of potential damage to the rock mass and ground support system (rock bolts and shotcrete) from the specified explosion...