... on a single bridging asperity results in the surface deformation of itself and the surrounding areas. The aggregate of such deformations exerted by all contacting asperities leads to the total deformation of a fracture. Therefore, the deformation behaviour of a stressed fracture is governed by the mechanical...

... geological subdiscipline geologist reservoir geomechanics geology machine learning environmental science 861 society iop publishing iop conf evolution compaction young numerical modeling hu lawrence berkeley national laboratory artificial intelligence modeling conference asperity 11th...

... Abstract The deformation and failure behavior of fractured rock mass is closely related to the unevenness of the fracture surface. The deformation behavior of asperities on rough fracture surfaces has not been studied comprehensively. This paper aims to study the effect of geometric parameters...

... engineering projects. In this study, multistage normal loading (30, 60, 90, 180, and 360 kN) direct shear tests were conducted on a smooth planar joint using a large shear box device. Four numerical models with different joint asperities were built in parallel using Fast Lagrangian Analysis of Continua...

... surfaces, while the shear strength of snipping-type joints is mainly dominated by the material strength of asperities. The inherent friction of contact surfaces decreases with shear displacement rate. However, the shear strength of material increases with increase of the shear displacement rate. 1...

... phenomenon where the self-propping effect can improve the reservoirs permeability due to surface asperities of weakness planes. However, there are very complex mechanical phenomena induced by weakness planes under higher effective stress. When hydraulic fractures encounter the pre-existing weakness planes...

... Characterization Singapore normal deformation curve unevenness hydraulic fracturing rock joint joint closure equation normal stiffness Upstream Oil & Gas closure rock mechanics symposium arms10 29 joint profile Modeling & Simulation isrm international symposium asperity normal deformation...

... surface asperities height is developed, and the value of hydraulic aperture under different shear displacements is determined using the multi-scale wave decomposition method based on the wavelet theory and some statistical indices. For this purpose, a high resolution laser scanning system is applied...

.... In this research, each of the upper and lower profiles of joint surfaces is considered as a 2-dimensional wave. Then, multi-scale decomposition based on wavelet theory has been applied studying on asperities. Upper and lower profiles have been combined to produce a composite surface having asperities...

... Characterization rock-rock joint normal load shear displacement shear strength structural geology joint surface maximum shear stress asperity primary asperity Upstream Oil & Gas acoustic emission secondary asperity shear stress joint sample reservoir geomechanics concrete-concrete joint...

... torque cutter disk cutter wear karaj-tehran water conveyance tunnel asperity bit selection Wear Rate prediction normal force cutter wear tunnel adhesive wear thrust ISRM International Symposium 2008 5th Asian Rock Mechanics Symposium (ARMS5), 24-26 November 2008 Tehran, Iran A STUDY...

... ABSTRACT It is obvious that surface irregularities of a rock joint play a dominant role in its closure behavior. Therefore, special attention should be paid for the study of surface irregularities consisting of asperities in different scales. The laboratory tests of model joints are mainly...

... for the reversed shear loading direction, and anisotropic shear behavior and its dependence on the normal stress level were identified from the cyclic shear test results. These features and their variations in the subsequent loading cycles are mainly due to the effect of second order asperities and strength...

... materials that have consistent properties. Upstream Oil & Gas normal stress Johnstone rock mass structural geology displacement envelope direct shear testing stiffness Reservoir Characterization strength rock joint asperity preliminary result initial normal stress orientation...