... engineering rock engineering evolution rock mechanic primary creep waveform hedayat international journal monitoring sg specimen creep test mining science ARMA 23 0337 Monitoring of primary and secondary creep in granite using ultrasonic monitoring and digital image correlation Imani, Mehrdad...

... against laboratory creep tests, but nearly all historic creep tests have been performed at equivalent stresses of 8 MPa or higher. Creep rates at lower equivalent stresses are very slow, such that tests take months or years to run, and the tests are sensitive to small temperature perturbations (<0.1°C...

... the time-dependent deformation of brittle rocks in terms of constant strain-rate triaxial tests at different confining pressures, axial and volumetric deformation in creep tests, and creep strain rate and time-to-failure at different stress states using the same set of material parameters. 1. INTRODUCTION...

... laboratory creep tests have been conducted to study the creep behaviour of different types of intact or fractured rock samples. Based on experimental data several creep models have been proposed to reproduce the creep behaviour observed empirically; however, these approaches often do not reproduce all phases...

... of affecting rock creep characteristics. In the early 1990s, Martin, 1995 carried out the creep test of tuff with the temperature of 250 and the confining pressure of 5 MPa, the result showed that both the strength and creep deformation of the tuff are affected by the temperature. Quansheng Liu et al., 2001...

... constant stress states. Subsequently, small specimens were also prepared for SEM imaging to visualize cracks at grain level. 2. EXPERIMENTAL SETUP 2.1 Triaxial Creep Test of Shale Specimen Creep tests were performed on shale specimens in the servo-controlled triaxial machine (RTX-1500). Axial and lateral...

... constitutive model which should capture the creep behavior of Vaca Muerta formation. To achieve this goal, many time cycling triaxial deformation creep tests were performed over many Vaca Muerta rock samples. A phenomenological creep constitutive model from the literature such as the Power Law was tested...

... complex reservoir heterogeneity Sone hydraulic fracturing strength shale gas humidity dark-p sample GPa contact creep modulus Zoback indentation test indentation nanoindentation mineral hardness creep test moduli creep compliance 1. INTRODUCTION Recent technological advances...

... and therefore a creep compliance function is needed to extrapolate laboratory findings and to model long-term behavior. reservoir geomechanics Upstream Oil & Gas Artificial Intelligence Reservoir Characterization complex reservoir Prony series experiment creep data creep test creep strain...

... ABSTRACT: For fundamental understanding of the roof fall, this research is focused on determining the time-delayed deformation. A series of triaxial single-stage creep tests was performed on Marcellus shale. The specimens were cored parallel and perpendicular to the bedding plane. X-ray...

... to the creep-induced closure of fractures. This paper reports a study on the influence of elevated temperature on the creep deformation of shale rocks. To this end, a series of multi-stage triaxial creep tests differing in stress conditions and temperature is carried out on two samples of the Mancos shale, one...

... ABSTRACT: Results from three compressive creep tests on dried crushed salt, focused on identifying the influence of pore pressure during reconsolidation, are presented. All tests were completed under a macroscopic hydrostatic confining pressure of 30 MPa while the internal pore pressure...

... thermal transfer is approached by linear parallel contact model via active thermal pipes. The validation of this DEM numerical model is verified by the laboratory creep test, and the model is capable of capturing the development of micro-fractures during creep test subjected to different temperatures...

... spray-on liner creep test Isothermal Creep Behaviour Investigation tensile strength constant tensile load 1. INTRODUCTION The major aim of rock support systems is to establish a safe and stable working condition for excavations through the planned service life. Since the 1990 s, in order...

... creep rate, must be known. To date, however, only limited secondary creep test data for sylvinite and halite have been published. Additional laboratory compression creep tests results for sylvinite and halite samples from seven different potash projects worldwide were compiled in this paper...

... vertical sample experiment complex reservoir triaxial creep experiment creep time-dependent deformation creep test differential stress creep stage deformation MPa loading creep experiment hv 35 Zoback power-law model horizontal sample anisotropy 1. INTRODUCTION A common challenge...

... strength stress difference time-dependent deformation deformation Upstream Oil & Gas shale MPa damage accumulation creep rate onset Wellbore Design axial strain creep test creep rupture strain rate 1. INTRODUCTION Fine-grained geological units are abundant and occupy over 50 percent...

... represented by stiffness degradation in grain surface elements; (3) damage in both surface and joint elements. We simulate creep tests in conditions typical of Compressed Air Energy Storage. The three models capture polycrystal stiffness degradation and the initiation, propagation and coalescence of cracks...

... in the international technical literature. The creep tests were performed in specimens with a length/diameter ratio of 2 (ISRM Standards) in a Laboratory of Rock Mechanics and Rock Hydraulics from IPT - Institute for Technological Research of the State of São Paulo - Brazil [6]. 2.2. Experimental Assembly A laboratory...

... degradation laws adopted in previously-developed statistical models. The general capabilities of the proposed model are illustrated with numerical simulations of biaxial creep tests. The influence of differential stresses on creep behavior in brittle rocks is also examined. Results from such analyses indicate...