Revised Shear Strength Model for Soil-Infilled Rock Joints Considering Over-Consolidation Effect

Indraratna, Buddhima; Oliveira, David; Jayanathan, M.

doi:10.36487/acg_repo/808_75

Cited by 3 publications

(1 citation statement)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Joint strength is also affected by joint roughness, stiffness of the contacting planes and the presence of infills. The characteristics and effect of infills are described in Indraratna et al (2008), Trivedi (2010) and Zare et al (2008). According to Indraratna et al (2008), infills decrease the frictional resistance, decrease the shear strength and if they exist in substantial amounts may determine the whole behaviour of the joint.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the corollary of the interdependency of rock joint properties on subsurface fracturing

Eshiet

Sheng

Yang

2020

Bull Eng Geol Environ

View full text Add to dashboard Cite

The characteristics of structural discontinuities in the subsurface environment often play a key role in the overall behaviour of such systems and their response to externally imposed conditions. Rock joints are one of such features that constitute the heterogeneity of rock masses. Akin to other forms of discontinuities, the characteristics of rock joints affect the performance of their parent rock masses, which are constituents of rock formations. The fracturing process is one of such key geomechanical phenomena that is inevitably influenced by pre-existing joints. A numerical technique implemented via a discrete element method (DEM) is herein adopted to evaluate two fundamental properties that control the shear and dilatancy responses of discontinuities. Though these properties are also assessed in isolation, their inter-dependency, which is a dominant factor, is investigated.As joint frictional resistance increases, it escalates the potential of the joint to attenuate the rate of fracture growth. On the other hand, an increase in joint dilatancy increases the intensity of fracturing. The impact of joint frictional resistance is more pronounced at high friction magnitudes and in this range the predominant influence of joint friction overwhelms any effect of joint dilatancy. Contrarily, at low joint frictional resistance, contributions from even a small magnitude of joint dilatancy increases the degree of fracturing. The inter-relationship between joint friction and dilatancy has influencing implications that govern the performance of rock masses. An inquiry into their combined contributions provides information prerequisite for a more accurate estimation and appraisal of fracture behaviour in underground systems.

show abstract

Section: Introductionmentioning

confidence: 99%

Evaluating the corollary of the interdependency of rock joint properties on subsurface fracturing

Eshiet

Sheng

Yang

2020

Bull Eng Geol Environ

View full text Add to dashboard Cite

show abstract

The role of rock joint frictional strength in the containment of fracture propagation

Eshiet

Sheng

2016

Acta Geotech.

View full text Add to dashboard Cite

The fracturing phenomenon within the reservoir environment is a complex process that is controlled by several factors and may occur either naturally or by artificial drivers. Even when deliberately induced, the fracturing behaviour is greatly influenced by the subsurface architecture and existing features. The presence of discontinuities such as joints, artificial and naturally occurring faults and interfaces between rock layers and microfractures plays an important role in the fracturing process and has been known to significantly alter the course of fracture growth. In this paper, an important property (joint friction) that governs the shear behaviour of discontinuities is considered. The applied numerical procedure entails the implementation of the discrete element method to enable a more dynamic monitoring of the fracturing process, where the joint frictional property is considered in isolation. Whereas fracture propagation is constrained by joints of low frictional resistance, in nonfrictional joints, the unrestricted sliding of the joint plane increases the tendency for reinitiation and proliferation of fractures at other locations. The ability of a frictional joint to suppress fracture growth decreases as the frictional resistance increases; however, this phenomenon exacerbates the influence of other factors including in situ stresses and overburden conditions. The effect of the joint frictional property is not limited to the strength of rock formations; it also impacts on fracturing processes, which could be particularly evident in jointed rock masses or formations with prominent faults and/or discontinuities.

show abstract

Laboratory Study of the Shear Behaviour of Natural Rough Rock Joints Infilled by Different Soils

Naghadehi

2015

Period. Polytech. Civil Eng.

View full text Add to dashboard Cite

IntroductionOver many years, fine sediments resulting from weathering and other surface processes could subsequently ingress to rock joints, reducing the overall shear strength of the joint surface [1][2][3]. Rock joints that are naturally filled with fine materials (see 2) are likely to be the weakest elements in a rock mass and can have a dominant influence on its shear behaviour due to of the low frictional properties of the infill [4,5].The most effect of filling material is to separate the discontinuity walls and thereby reduce intact rock contact, but shear strength will also be influenced by the nature of the filling material itself and the characteristics of the wall-fill interfaces. Because of the lack of reliable and realistic theoretical or empirical relations and the difficulties in obtaining and testing representative samples, engineers generally rely on judgment, often considering the shear strength of the infill itself to be conservative. In critical cases, in situ tests may be carried out to provide site specific design criteria, but invariably amount of testing that can be undertaken precludes the establishment of fundamental relations. During the past 30 years much more information has become available on the shear behavior of joints infilled with soil material. Several models have been proposed to predict the shear strength of infilled joints under both constant normal load (CNL) and constant normal stiffness (CNS) boundary conditions, considering the ratio of infill thickness (t) to the height of the joint wall asperity (a), i.e., t/a ratio [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. The experimental researches to date have tended to focus on modelled joints or replicas rather than natural rock joints. In other words, although some works have been done on the effect of infill material by using natural rock joints, they have not proposed prediction models and it can be noted that most of the previous models in the literature have been developed based on the laboratory tests over the simulated artificial joints and not on the real rock joints (for simplicity and reproducibility reasons). In addition, there have been no shear behaviour models which consider differences in infill type within the rock joint. However, this research will give an account of application of a statistical analysis on a series of data obtained from a complete testing program on natural infilled rock joints, taking into account three different material fill-

show abstract

Revised Shear Strength Model for Soil-Infilled Rock Joints Considering Over-Consolidation Effect

Cited by 3 publications

References 8 publications

Evaluating the corollary of the interdependency of rock joint properties on subsurface fracturing

Evaluating the corollary of the interdependency of rock joint properties on subsurface fracturing

The role of rock joint frictional strength in the containment of fracture propagation

Laboratory Study of the Shear Behaviour of Natural Rough Rock Joints Infilled by Different Soils

Contact Info

Product

Resources

About