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| 1 | Characterizing the influence of stress-induced microcracks on the laboratory strength and fracture development in brittle rocks using a finite-discrete element method-micro discrete fracture network FDEM-μDFN approach显示文摘Heterogeneity is an inherent component of rock and may be present in different forms including mineral heterogeneity,geometrical heterogeneity,weak grain boundaries and micro-defects.Microcracks are usually observed in crystalline rocks in two forms:natural and stress-induced;the amount of stressinduced microcracking increases with depth and in-situ stress.Laboratory results indicate that the physical properties of rocks such as strength,deformability,P-wave velocity and permeability are influenced by increase in miciocrack intensity.In this study,the finite-discrete element method(FDEM)is used to model microcrack heterogeneity by introducing into a model sample sets of microcracks using the proposed micro discrete fracture network(μDFN) approach.The characteristics of the microcracks required to create μDFN models are obtained through image analyses of thin sections of Lac du Bonnet granite adopted from published literature.A suite of two-dimensional laboratory tests including uniaxial,triaxial compression and Brazilian tests is simulated and the results are compared with laboratory data.The FDEM-μDFN models indicate that micro-heterogeneity has a profound influence on both the mechanical behavior and resultant fracture pattern.An increase in the microcrack intensity leads to a reduction in the strength of the sample and changes the character of the rock strength envelope.Spalling and axial splitting dominate the failure mode at low confinement while shear failure is the dominant failure mode at high confinement.Numerical results from simulated compression tests show that microcracking reduces the cohesive component of strength alone,and the frictional strength component remains unaffected.Results from simulated Brazilian tests show that the tensile strength is influenced by the presence of microcracks,with a reduction in tensile strength as microcrack intensity increases.The importance of microcrack heterogeneity in reproducing a bi-linear or S-shape failure envelope and its effects on the mechanisms leading to spalling damage near an underground opening are also discussed. | Pooya Hamdi Doug Stead Davide Elmo | 2015 | Journal of Rock Mechanics and Geotechnical Engineering2015，7，6： | 6 |
| 2 | 尼古丁替代疗法的戒烟治疗显示文摘 | Silagy G Lancaster T Stead L Mant D Folower G 于淑秀 孙伟 于冬梅 | 2005 | 中国循证医学杂志2005，5，7： | 3 |
| 3 | Development of a spring analogue approach for the study of pillars and shafts显示文摘In civil and mining operations that involve ground excavation and support, the loads are distributed between the ground and support depending on their relative stiffness. This paper presents the development of conceptual single-degree-of-freedom models, which are used to derive equations for estimating displacements and stresses for ground-support interaction problems encountered in pillars in room-andpillar mining(natural support system), and liners for circular vertical shafts(artificial support systems).For pillar assessment, mine-pillar interaction curves can be constructed using a double spring analogy.Additionally, the effectiveness of different support systems can be evaluated depending on their effect upon the mine-pillar system. For shaft design, an initial estimation of the required lining strength and thickness can be readily made based on a double ring analogue. For both problems, the results from the proposed approach compare well with those obtained by finite element numerical simulations. | Amichai Mitelman Davide Elmo Doug Stead | 2018 | International Journal of Mining Science and Technology2018，28，2： | 2 |
| 4 | S100 as a marker of acute brain ischemia : a systematic review显示文摘 | Nash DL Bellolio MF Stead LG | 2008 | Neurocrit Care2008，8，2： | 1 |
| 5 | Downsizing,delayering-but where is the commitment? The development of a diagnostic tool to help management survivors显示文摘 | THORNHILL A SAUNDERS M N K STEAD J | 1997 | Personnel Review1997，26，12： | 1 |
| 6 | The role of hyperglycemia in acute ischemic stroke 显示文摘 | GILMORE R M STEAD L G | 2006 | Neurocrit Care2006，5，2： | 1 |
| 7 | Characterization of homocysteine metabolism in the rat liver显示文摘 | Brosnan ME Brosnan JT | 2000 | Biochem J2000，350，3： | 1 |
| 8 | A simple prag matic system for detecting new cases of type 2 diabetes and impaired fasting glyeaemia in primary care 显示文摘 | Greaves CJ Stead JW Hattersley AT | 2004 | Faro Pract2004，21，1： | 1 |
| 9 | Prevalence of mucosal lesions in the stomach and duoclenum clue to use of NSAID in patients with rheumatoid arthritis or osteoarthristis,and interim report on prevention by misoprostol of doclofenac associated lesions显示文摘 | Geis Gs Stead H Walle mark CB | 1991 | J Rheumatol1991，18，28： | 1 |
| 10 | Statins in ischernic stroke : just low-density lipoprotein lowering or more? 显示文摘 | Stead LG Vaidyanathan L Kumar G | 2009 | J Stroke Cerebro- vase Dis2009，18，2： | 1 |
| 11 | Physician advice for smoking ces- sation 显示文摘 | Stead LF Bergson G Lancaster T | 2008 | Coehrane Database Syst Rev2008，2，00： | 1 |
| 12 | Development andvalidation of screening and confirmatory methods for the detectionof chloramphenicol and chloramphenicol glucuronide using SPRbiosensor and liquid chromatography-tandem mass spectrometry显示文摘 | Ashwin H M Stead S L Taylor J C | 2005 | Anal Chim Acta2005，529，12： | 1 |
| 13 | A systematic review of interventions for smokers who contact quitlines 显示文摘 | Stead LF Perera R Lancaster T | 2007 | Tob Control2007，16，1： | 1 |
| 14 | Comparison of gamma scintigraphy and a pharmacokinetic technique for assessing pulmonary deposition of terbutalin e sulphate delivered by pressurized metered dose inhaler显示文摘 | Stephen Newman Karen Stead Gerard Hooper | 1995 | pharmacetical rese arch1995，12，2： | 1 |
| 15 | Mast cells are closely apposed to nerves in the human gastrointestinal mucosa 显示文摘 | Stead RH Dixon MF Bramwell NH | 1989 | Gas- troenterology1989，97，3： | 1 |
| 16 | New technologies and international location-al choice for research and development units : Evidence from Eu- rope显示文摘 | Voelker R Stead R | 1999 | Technology Analysis & Strategic Management1999，11，2： | 1 |
| 17 | N-(3-oxohexanoyl)-L-homoserine lactone regulates carbapenem antibiotic production in Erwinia carotovora 显示文摘 | Bainton N J Stead P Chhabra S R | 1992 | Biochemical Journal1992，288，： | 1 |
| 18 | Intestinal mucosal mast cells in normal and nematode-infected rat intestines are in intimate contact with peptidergic nerves显示文摘 | Stead RH Tomioka M Quinonez G | 1987 | Pro Natl Acad Sci USA1987，84，9： | 1 |
| 19 | Diversity of endotoxin and its impact on pathogenesis显示文摘 | Trent MS Stead CM Tran AX | 2006 | J Endotoxin Res2006，12，4： | 1 |
| 20 | Identifying crack initiation and propagation thresholds in brittle rock显示文摘 | EBERHARDT E STEAD D STIMPSON B | 1998 | Canadian Geotechnical Journal1998，35，2： | 1 |
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