Results 71 to 80 of about 20,540 (222)

Optimal mud pressure design using nonlinear failure criteria for wellbores in shaley sedimentary reservoir

Deep Underground Science and Engineering, EarlyView.
The present study uses the Modified Mohr‐Coulomb true‐triaxial failure criterion (MMC_TT), which predicts the strength of rock better than the MGC criterion in laboratory true‐triaxial tests to overcome the limitations. Moreover, based on the data from previously published five vertical wells in the Krishna‐Godavari basin (K‐G basin), an empirical ...
Ravindra K. Burnwal, Aditya Singh
wiley   +1 more source

Permeability evolution during progressive development of deformation bands in porous sandstones [PDF]

, 2003
[1] Triaxial deformation experiments were carried out on large (0.1 m) diameter cores of a porous sandstone in order to investigate the evolution of bulk sample permeability as a function of axial strain and effective confining pressure.
Antonellini, Antonellini, Aydin, Aydin, B. T. Ngwenya, Beach, Bruno, Caine, Crawford, Evans, Fowles, Gibson, Grueschow, Hippler, I. G. Main, Jamison, Knipe, Knipe, Knott, Main, Main, Main, Mair, Mair, Manzocchi, Menendez, Moore, Ngwenya, Ngwenya, Ngwenya, O. Kwon, Ogilvie, Popp, Ramsay, Rhett, Rojstaczer, Rudnicki, S. C. Elphick, Scholz, Scott, Shipton, Sibson, Sverdrup, Taylor, Tuefel, Underhill, Wong, Zang, Zhang, Zhu, Zhu, Zoback   +51 more
core   +3 more sources

Strain‐based modeling and analysis for rock blasting and geomechanics applications

Deep Underground Science and Engineering, EarlyView.
This paper introduces a novel strain‐based modeling approach for blasting and geomechanical applications, using measurable variables like particle velocity, strain, and displacement. By bypassing complex constitutive relations, strain‐based models capture critical blasting trends and full‐blast design parameters with minimal calibration.
Ruilin Yang
wiley   +1 more source

Experimental Investigation on the Deformation, Strength, and Acoustic Emission Characteristics of Sandstone under True Triaxial Compression

Advances in Materials Science and Engineering, 2018
The study of deformation, strength, and other mechanical characteristics of sandstone under true triaxial compression is significant for understanding failure mechanisms in rock and evaluating the stability of underground structures.
Zhaolin Li, Lianguo Wang, Yinlong Lu, Wenshuai Li, Kai Wang   +4 more
doaj   +1 more source

Probability prediction of true‐triaxial compressive strength of intact rocks based on the improved PSO‐RVM model

Deep Underground Science and Engineering, EarlyView.
In this work, we propose an improved particle swarm optimization (PSO) algorithm and develop an improved PSO‐relevance vector machine (RVM) model as a substitute for traditional true‐triaxial testing. The model's high prediction accuracy was validated through comparisons with two other machine learning methods and five three‐dimensional Hoek–Brown type
Qi Zhang, Maohui Wang, Ning Wang, Yixin Shen, Xuzhen He   +4 more
wiley   +1 more source

Progressive damage and fracture behavior of brittle rock under multi-axial prestress constraint and cyclic impact load coupling

Geomechanics and Geophysics for Geo-Energy and Geo-Resources
To explore the progressive damage and fracture mechanics characteristics of brittle rock materials under combined dynamic-static loading. Taking account of the coupling effect of the constraint states of uniaxial stress (σ 1 ≥ σ 2 = σ 3 = 0), biaxial ...
Jinrui Zhang, Yi Luo, Junhong Huang, Hangli Gong, Jianping Wang   +4 more
doaj   +1 more source

Experimental artefacts in undrained triaxial testing [PDF]

, 2010
For evaluation of the undrained thermo-poro-elastic properties of saturated porous materials in conventional triaxial cells, it is important to take into account the effect of the dead volume of the drainage system.
Ghabezloo, Siavash, Sulem, Jean
core   +3 more sources

Laboratory observations of permeability enhancement by fluid pressure oscillation of in situ fractured rock [PDF]

, 2011
We report on laboratory experiments designed to investigate the influence of pore pressure oscillations on the effective permeability of fractured rock.
Brodsky, Emily E., Elkhoury, Jean E., Marone, Chris, Niemeijer, André   +3 more
core   +4 more sources

Effect of confining pressure on fracture characteristics and mineralogical behavior of tight sandstone specimens after hydraulic fracturing

Deep Underground Science and Engineering, EarlyView.
Hydraulic fracturing in tight sandstone and fracture propagation characteristics using backscattered electron‐scanning electron microscope (BSE‐SEM) images. Abstract This study focuses on hydraulic fracturing experiments conducted under triaxial conditions on tight sandstone specimens from Shivpuri district, Madhya Pradesh, India.
Pankaj Rawat, Narendra Kumar Samadhiya
wiley   +1 more source

Cosmology in 2D: the concentration-mass relation for galaxy clusters [PDF]

, 2012
The aim of this work is to perform a systematic study of the measures of the mass and concentration estimated by fitting the convergence profile of a large sample of mock galaxy cluster size lenses, created with the publicly available code MOKA. We found
Andreon, Bahé, Bartelmann, Becker, Becker, Blumenthal, Boylan-Kolchin, Carlo Giocoli, Clowe, Coe, Conroy, Corless, Corless, De Lucia, Dolag, Eke, Ettori, Ettori, Fedeli, Gao, Gao, Gavazzi, Giocoli, Giocoli, Giocoli, Giocoli, Giocoli, Gnedin, Hernquist, Hoekstra, Hoekstra, Jaffe, Jing, Jing, Kazantzidis, Keeton, Komatsu, Kuijken, Lacey, Lauro Moscardini, Macciò, Macciò, Massimo Meneghetti, Meneghetti, Meneghetti, Meneghetti, Meneghetti, Metcalf, Morandi, Navarro, Neto, Oguri, Oguri, Okabe, Okabe, Perlmutter, Perlmutter, Postman, Rasia, Rix, Sereno, Shaw, Sheth, Sheth, Sheth, Springel, Springel, Stefano Ettori, Tormen, Umetsu, van den Bosch, Wang, Wechsler, White, Zhao, Zitrin   +75 more
core   +2 more sources