Frictional behaviour of sandstone: A sample-size dependent triaxial investigation

Published on Jan 1, 2017in Journal of Structural Geology2.836
· DOI :10.1016/J.JSG.2016.11.014
Hamid Roshan21
Estimated H-index: 21
(UNSW: University of New South Wales),
Hossein Masoumi11
Estimated H-index: 11
(UNSW: University of New South Wales),
Klaus Regenauer-Lieb37
Estimated H-index: 37
(UNSW: University of New South Wales)
Sources
Abstract
Abstract Frictional behaviour of rocks from the initial stage of loading to final shear displacement along the formed shear plane has been widely investigated in the past. However the effect of sample size on such frictional behaviour has not attracted much attention. This is mainly related to the limitations in rock testing facilities as well as the complex mechanisms involved in sample-size dependent frictional behaviour of rocks. In this study, a suite of advanced triaxial experiments was performed on Gosford sandstone samples at different sizes and confining pressures. The post-peak response of the rock along the formed shear plane has been captured for the analysis with particular interest in sample-size dependency. Several important phenomena have been observed from the results of this study: a) the rate of transition from brittleness to ductility in rock is sample-size dependent where the relatively smaller samples showed faster transition toward ductility at any confining pressure; b) the sample size influences the angle of formed shear band and c) the friction coefficient of the formed shear plane is sample-size dependent where the relatively smaller sample exhibits lower friction coefficient compared to larger samples. We interpret our results in terms of a thermodynamics approach in which the frictional properties for finite deformation are viewed as encompassing a multitude of ephemeral slipping surfaces prior to the formation of the through going fracture. The final fracture itself is seen as a result of the self-organisation of a sufficiently large ensemble of micro-slip surfaces and therefore consistent in terms of the theory of thermodynamics. This assumption vindicates the use of classical rock mechanics experiments to constrain failure of pressure sensitive rocks and the future imaging of these micro-slips opens an exciting path for research in rock failure mechanisms.
📖 Papers frequently viewed together
29 Citations
25 Citations
8 Citations
References80
Newest
#1Hamid Roshan (UNSW: University of New South Wales)H-Index: 21
#2Mustafa Sari (UNSW: University of New South Wales)H-Index: 2
Last. Klaus Regenauer-Lieb (UNSW: University of New South Wales)H-Index: 37
view all 10 authors...
Total rock porosity is a key parameter in a wide range of disciplines from petroleum to civil and mining engineering. Porosity is particularly important in petroleum engineering applications, e.g., from estimation of hydrocarbon in place to prediction of geomechanical properties. Conventional techniques used to measure the total porosity, i.e., mercury intrusion, nitrogen physisorption, focused ion beam–scanning electron microscopy (FIB–SEM), nuclear magnetic resonance (NMR) spectroscopy, gas po...
18 CitationsSource
#1Hamid RoshanH-Index: 21
#2Hossein Masoumi (UNSW: University of New South Wales)H-Index: 11
Last. Paul C. Hagan (UNSW: University of New South Wales)H-Index: 16
view all 3 authors...
10 Citations
#1Hossein Masoumi (UNSW: University of New South Wales)H-Index: 11
#2Serkan Saydam (UNSW: University of New South Wales)H-Index: 14
Last. Paul C. Hagan (UNSW: University of New South Wales)H-Index: 16
view all 3 authors...
AbstractA suite of laboratory testing was performed on Gosford sandstone samples having a range of sizes, including point-load and uniaxial compressive tests. A unified size-effect law (USEL), based on the work by Zdenek Bazant, involving fracture energy as well as fractal theories, was introduced. It was shown that USEL correlates well with the ascending and descending uniaxial compressive strength trends obtained from Gosford sandstone as well as five other rock types reported by Brian Hawkins...
27 CitationsSource
#1Klaus Regenauer-Lieb (UNSW: University of New South Wales)H-Index: 37
#2Thomas Poulet (UNSW: University of New South Wales)H-Index: 19
Last. Manolis Veveakis (UNSW: University of New South Wales)H-Index: 12
view all 3 authors...
A novel wave-mechanics approach is developed specifically for understanding instabilities that form large natural fluid-transmissivity networks in unconventional reservoirs located in a nominally impermeable matrix. These natural flow networks are trapped in the ductile equivalent of brittle faults characterized by the solid-mechanical Arthur-Vardoulakis angle. The main mechanism for ductile deformation and in situ fluid generation is identified to be a chemical reaction such as diagenesis. Diag...
8 CitationsSource
#1Patrick Baud (UDS: University of Strasbourg)H-Index: 52
#2Thierry Reuschlé (UDS: University of Strasbourg)H-Index: 27
Last. Teng-fong Wong (CUHK: The Chinese University of Hong Kong)H-Index: 63
view all 5 authors...
We performed a systematic investigation of mechanical compaction and strain localization in Bleurswiller sandstone. Our data show that the effective pressure principle can be applied in both the brittle faulting and cataclastic flow regimes, with an effective pressure coefficient close to but somewhat less than 1. Under relatively high confinement, the samples typically fail by development of compaction bands. X-ray computed tomography (CT) was used to resolve preexisting porosity clusters, as w...
51 CitationsSource
#1Brett M. Carpenter (PSU: Pennsylvania State University)H-Index: 25
#2Demian M. Saffer (PSU: Pennsylvania State University)H-Index: 50
Last. Chris Marone (PSU: Pennsylvania State University)H-Index: 64
view all 3 authors...
We present results from a comprehensive laboratory study of the frictional strength and constitutive properties for all three active strands of the San Andreas Fault penetrated in the San Andreas Observatory at Depth (SAFOD). The SAFOD borehole penetrated the Southwest Deforming Zone (SDZ), the Central Deforming Zone (CDZ), both of which are actively creeping, and the Northeast Boundary Fault (NBF). Our results include measurements of the frictional properties of cuttings and core samples recove...
48 CitationsSource
#1E. Veveakis (UNSW: University of New South Wales)H-Index: 6
#2Klaus Regenauer-Lieb (UNSW: University of New South Wales)H-Index: 37
Abstract Cnoidal waves are nonlinear and exact periodic stationary waves, well known in the shallow water theory of fluid mechanics. In this study we retrieve such periodic stationary wave solutions as singularities of the problem of homogeneous volumetric deformation of a rate-dependent, heterogeneous solid material. In accordance to the classical Hill stationary wave localization instability, which provides velocity gradient discontinuities in shear failure, cnoidal waves are dilational and co...
31 CitationsSource
#1E. Veveakis (UNSW: University of New South Wales)H-Index: 6
#2Klaus Regenauer-Lieb (UNSW: University of New South Wales)H-Index: 37
Variational principles applied to the time derivative of the second law of thermodynamics have led to significant progress of our understanding of dynamic systems. Prigogine proved that chemical species dynamically form an oscillatory pattern of minimum of entropy production, MinEP . The opposite MaxEP 3 postulate forms the foundation of continuum mechanics. The topic of which extremum is valid under what conditions is still subject of a heated debate. We posit here that the two principles emerg...
19 CitationsSource
#1Jie Liu (SYSU: Sun Yat-sen University)H-Index: 6
#2R. Freij-Ayoub (CSIRO: Commonwealth Scientific and Industrial Research Organisation)H-Index: 8
Last. Klaus Regenauer-Lieb (UNSW: University of New South Wales)H-Index: 37
view all 3 authors...
We present a workflow for upscaling of rock properties using microtomography and percolation theory. In this paper we focus on a pilot study for assessing the plastic strength of rocks from a digital rock image. Firstly, we determine the size of mechanical representative volume element (RVE) by using upper/lower bound dissipation computations in accordance with thermodynamics. Then the mechanical RVE is used to simulate the rock failure at micro-scale using FEM. Two cases of different pressures ...
5 CitationsSource
#1M. Forbes (UNSW: University of New South Wales)H-Index: 1
#2Hossein Masoumi (UNSW: University of New South Wales)H-Index: 11
Last. Paul C. Hagan (UNSW: University of New South Wales)H-Index: 16
view all 4 authors...
6 Citations
Cited By16
Newest
#1Muhammad Asad Pirzada (UNSW: University of New South Wales)H-Index: 3
#2M. Bahaaddini (SBUK: Shahid Bahonar University of Kerman)H-Index: 9
Last. Hamid Roshan (UNSW: University of New South Wales)H-Index: 21
view all 4 authors...
Abstract null null The role of surface geometry and its evolution during shearing process on the hydromechanical behaviour of rock discontinuities has long remained an open question for geologist. During the shearing process, only a fraction of discontinuity is in contact and the actual stresses on these contacts are considerably greater than nominal stresses. However, measuring the contact area during shearing process has been a significant experimental challenge due to difficulties in detectio...
Source
#1Kaihui Li (CSU: Central South University)H-Index: 10
#2Zhen Yu Yin (PolyU: Hong Kong Polytechnic University)H-Index: 1
Last. Hang Lin (CSU: Central South University)H-Index: 26
view all 6 authors...
A series of uniaxial and triaxial compression tests were performed on slate samples with different diameters at different foliation orientations with respect to the direction of the major principal stress. The size effect and anisotropy in slate, as a transversely isotropic rock, were investigated, and the research focused on aspects of elastic properties, uniaxial compressive strength (UCS), triaxial compressive strength (TCS), and triaxial residual strength (TRS). In the five elastic constants...
1 CitationsSource
#1Adelina Lv (UNSW: University of New South Wales)H-Index: 4
#2Mohammad Ali Aghighi (UNSW: University of New South Wales)H-Index: 9
Last. Hamid Roshan (UNSW: University of New South Wales)H-Index: 21
view all 4 authors...
The effective stress coefficient (ESC) is a key parameter in the linear poroelastic effective stress formulation. In fluid-bearing porous media, the effective stress is the difference between total stress and a fraction of the pore fluid pressure controlled by the ESC. The ESC is either measured in the laboratory or estimated by empirical models using field data. Among different techniques, sonic velocity measurements are widely used to estimate the ESC. The structure of coal, however, has some ...
1 CitationsSource
#1B W IsahH-Index: 1
#2Hisham Mohamad (UTP: Universiti Teknologi Petronas)H-Index: 12
The paper explores the possibility of using high-resolution fiber Bragg grating (FBG) sensing technology for on-specimen strain measurement in the laboratory. The approach provides a means to assess the surface deformation of the specimen, both the axial and radial, through a chain of FBG sensor (C-FBG), in a basic setup of a uniaxial compression test. The method is cost-effective, straightforward and can be commercialized. Two C-FBG; one was applied directly to the sample (FBGBare), and the oth...
Source
#1Mohammed Abdul Qadeer Siddiqui (UNSW: University of New South Wales)H-Index: 7
#2Adelina Lv (UNSW: University of New South Wales)H-Index: 4
Last. Hamid Roshan (UNSW: University of New South Wales)H-Index: 21
view all 4 authors...
Abstract Despite significant advances in micro-scale measurement techniques for investigations in subsurface energy-bearing geomaterials, they have been unable to incorporate subsurface geomechanical conditions such as in-situ stresses in their applications. To overcome such lacking, we designed a novel high-pressure shear cell capable of measuring chemo-thermo-mechanical behaviour of actual (not synthetic) geomaterials by allowing application of critical stresses while simultaneously being expo...
2 CitationsSource
#1Edoardo Rossi (ETH Zurich)H-Index: 6
#2Martin O. Saar (ETH Zurich)H-Index: 30
Last. Philipp Rudolf von Rohr (ETH Zurich)H-Index: 32
view all 3 authors...
To improve the economics and viability of accessing deep georesources, we propose a combined thermo–mechanical drilling (CTMD) method, employing a heat source to facilitate the mechanical removal of rock, with the aim of increasing drilling performance and thereby reducing the overall costs, especially for deep wells in hard rocks. In this work, we employ a novel experiment setup to investigate the main parameters of interest during the interaction of a cutter with the rock material, and we test...
3 CitationsSource
#1Muhammad Asad Pirzada (UNSW: University of New South Wales)H-Index: 3
#2Hamid Roshan (UNSW: University of New South Wales)H-Index: 21
Last. M. Bahaaddini (SBUK: Shahid Bahonar University of Kerman)H-Index: 9
view all 7 authors...
Abstract Frictional behaviour of joints/faults is of great importance in many geo-engineering applications across different scales. It is known that the joint surface roughness is one of the critical parameters controlling the frictional behaviour of rock joints. While nominal normal and shear stresses acting across the joint asperities are calculated based on overall shearing area, the actual normal and shear stresses can be much greater due to smaller actual contact area. The actual contact ar...
5 CitationsSource
#1Karina Barbosa (UQ: University of Queensland)H-Index: 1
#2Rick Chalaturnyk (U of A: University of Alberta)H-Index: 26
Last. Joan Esterle (UQ: University of Queensland)H-Index: 24
view all 5 authors...
Short impact load cell (SILC) tests provide insight on the dynamic breakage behaviour of rocks. The measured impact force to first fracture of a rock specimen is used to calculate properties such as fracture toughness, tensile strength, and stiffness. To explore the repeatability and performance of the SILC test and verify the underlying assumptions for interpreting the test measurements, a comprehensive SILC testing program was conducted using additively manufactured (3D-printed) sandstone. 3D-...
3 CitationsSource
#1Runhua Feng (Curtin University)H-Index: 4
#2Yihuai ZhangH-Index: 17
Last. Mohammad Sarmadivaleh (Curtin University)H-Index: 28
view all 5 authors...
The success of a hydraulic fracturing (HF) operation is strongly dependent on brittleness of the formation. Several models based on mechanical testing, mineral composition, and sonic log data have been proposed to quantify the brittleness of formations known as brittleness index (BI). The limitations of these conventional BI models, in particular, the consistency and applicability at field scale with the complex in situ conditions are poorly understood. We therefore developed a novel BI model ba...
21 CitationsSource
#1Gabriel Walton (Colorado School of Mines)H-Index: 14
#2D. Labrie (NRCan: Natural Resources Canada)H-Index: 2
Last. Leandro R. Alejano (University of Vigo)H-Index: 25
view all 3 authors...
8 CitationsSource