2 edition of Influence of shear velocity on the frictional resistance of rock discontinuities. found in the catalog.
Influence of shear velocity on the frictional resistance of rock discontinuities.
JosГ© Luis Carvalho
Written in English
|The Physical Object|
|Number of Pages||96|
Shear Velocity, also called friction velocity, is a form by which a shear stress may be re-written in units of is useful as a method in fluid mechanics to compare true velocities, such as the velocity of a flow in a stream, to a velocity that relates shear between layers of flow.. Shear velocity is used to describe shear-related motion in moving fluids. Discontinuities have, in-deed, an important influence on the deformational behaviour of rock systems. The choice of a general criterion to determine the shear strength of rough rock joints is a problem that has been investigated for many years. Numerous shear models have been proposed to relate shear-strength to measurable joint parameters, but.
Keywords: shear strength, artificial rock joints, direct shear test, constant normal loading, peak shear strength *** 1. INTRODUCTION The stability of underground mine excavations, tunnels, open pit slopes and others in a jointed rock mass is influenced by the shear-strength characteristics of the joints. Laboratory modelling of rock joints under shear and constant normal loading Laboratory modelling of rock joints under shear and constant normal loading Crawford, A.M. and Curran, J.H. (). The influence of shear velocity on the frictional resistance of rock discontinuities. Int. J. Rock Mech. Min. Sci. and Geomech. Abstr., Vol.
The effect of frictional fill thickness on the shear strength of rock discontinuities. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts, Vol. 30, Issue 2, , p. Author: Ping Cao, Huijuan Deng, Yu Chen, Ning Fu. The magnitude of the increase in peak velocity as a result of disintegration (i.e., increasing number of blocks) suggests that as much attention should be paid to the geometry of discontinuities as is typically paid to shear strength and pore pressure.
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An experimental investigation using a dynamic direct shear machine showed the frictional resistance of rock joints to be dependent on the rate of shear displacement and that the magnitude of this effect was quite variable, depending mainly on the rock type and normal stress by: The influence of the rate of shear displacement on the frictional resistance of rock discontinuities was examined by testing jointed samples of three rock types in a dynamic direct shear machine.
The influence of rock type, joint roughness, apparent area of contact, normal stress level and gouge infilling were investigated. The experiments consistently showed that the frictional resistance is dependent on the slip velocity. Understanding the fundamental issues related with the effect of shear velocity on frictional characteristics at the interface of rock surfaces is an important issue.
The influence of the rate of shear displacement on the frictional resistance of rock discontinuities was examined by testing jointed samples of three rock types in a dynamic direct shear machine.
The influence of rock type, joint roughness, apparent area of contact, normal stress level and gouge infilling were investigated. The experiments consistently showed that the frictional resistance is dependent on the slip by: Crawford AM, Curran JH () The influence of shear velocity on the frictional resistance of rock discontinuities.
Int J Rock Mech Min Sci Geomech Abstr 18(6)– ArticleCited by: The Coulomb-Navier criterion of rock joints can be expressed by where is the shear strength of the shear plane, is the inherent shear strength of rock joints which is similar to the definition of cohesion, is the frictional resistance on the shear surface, is the normal stress on the shear plane, and is the friction coefficient of rock : Shuhong Wang, Feili Wang, Feili Wang, Zhanguo Xiu.
Shear strength of concrete joints, except for rough joints with 10° inclination, increased with increasing shear velocity. Regardless of the normal stress level, shear stiffness of both planar plaster–plaster and concrete–concrete joints were decreased when the shear velocity was increased.
Open Advanced Search. The influence of pre-consolidation on shear strength of clay filled discontinuities Back Analysis of a Slope Failure Moshe Levin and Yossef H.
Hatzor Rock Mechanics Laboratory Dept. of Geological and Environmental Sciences Ben – Gurion University of the Negev Funded by: Rotem Amfert Negev. The shear strength along any plane is mobilized by cohesion and frictional resistance to sliding between soil particles. The cohesion c and angle of friction φ of a soil are collectively known as shear strength parameters.
In this chapter we will define, describe, and determine the shear strength of soils. The influence of slip rate on shear stiffness in frictional systems has only recently began to be explored in engineering rock mechanics (e.g., Atapour and Moosavi ), although this effect must be very important when trying to assess, quantitatively, stress accumulation on rock discontinuities during creep episodes in deep-seated.
The influence of the rate of shear displacement on the frictional resistance of rock discontinuities was examined by testing jointed samples of three rock types in a dynamic direct shear machine. CHAPTER TWO LITERA TURE STUDY ON THE SHEAR STRENGTH OF JOINTS IN ROCK Introduction Discontinuities such as bedding planes, joints, shear zones and faults form part of any rock mass.
The behaviour of the rock mass at shallow depth, where stresses are relatively low, is largely controlled by sliding of blocks of rock on joints (discontinuities).
Matt J. Ikari, André R. Niemeijer and Chris Marone, The role of fault zone fabric and lithification state on frictional strength, constitutive behavior, and deformation microstructure, Journal of Geophysical Research: Solid Earth,B8, (). André Niemeijer, Chris Marone and Derek Elsworth, Fabric induced weakness of tectonic faults, Geophysical Research Letters, 37, 3, ().
Influence of grain characteristics on the friction of granular shear zones studies show lower frictional strength and a greater ten-dency for instability than laboratory studies. In one class of center block at a specified load point velocity to initiate shear within the granular layer.
Layers compact and dilate. The relationship between slip velocity, resistance to shear, and geometrical evolution of initially rough limestone surfaces is investigated in servo-controlled direct shear experiments.
We focus on shear stress evolution throughout the deformation process, as function of the shear rates Author: Doron Morad, Yossef H. Hatzor, Amir Sagy. Pérez–Rey et al. () Effect of time and wear on the basic friction angle of rock discontinuities Estimated in our laboratory by means of tilt or pull test González et al.
() González et al. () High variability of results while testing same rock specimens. Crawford AM, Curran JH. The influence of shear velocity on the frictional resistance of rock discontinuities.
International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts 18 (6): Crossref, Google by: Inter-relationship between joint dilatancy and frictional resistance: impact on fracture behaviour Kenneth Imo-Imo Eshiet 1 and Yong Sheng.
1 School of Civil Engineering, University of Leeds, LS2 9JT, Leeds, United Kingdom. E-mail: [email protected] Abstract. ock joints possess features that alter both the characteristics of rock.
A discontinuity in geotechnical engineering (in geotechnical literature often denoted by joint) is a plane or surface that marks a change in physical or chemical characteristics in a soil or rock mass.A discontinuity can be, for example, a bedding, schistosity, foliation, joint, cleavage, fracture, fissure, crack, or fault plane.
A division is made between mechanical and integral discontinuities. Hadi Atapour and Mahdi Moosavi, The Influence of Shearing Velocity on Shear Behavior of Artificial Joints, Rock Mechanics and Rock Engineering, /s. shear strength in normally consolidated clays) may vary as a predictable function of a stratum dimension engineering properties of rock masses, with appropriate emphasis placed on visual observations and quantitative descriptions of the rock mass.
Influence of Existing and Future Conditions on Soil and Rock .Chapter 4 Engineering Classification of Rock Materials Engineering properties of rock To use rock in engineering applications, certain prop-erties of the rock must be assessed to reasonably pre-dict performance in the as-built condition.
The proper-ties of rock fall into two broad classes: rock material.Shear strength of planar surfaces 61 Figure Shear testing of discontinuities In the case of the residual strength, the cohesion c has dropped to zero and the relationship between φr and σn can be represented by: τσrn r= tanφ () where φr is the residual angle of friction.
This example has been discussed in order to illustrate the physical meaning of the termFile Size: KB.