Annales De Chimie-science Des Materiaux最新文献

{"title":"Evaluation of Mechanical Parameters of Bacterial Concrete","authors":"C. Durga, N. Ruben, M. Chand, C. Venkatesh","doi":"10.18280/acsm.430606","DOIUrl":"https://doi.org/10.18280/acsm.430606","url":null,"abstract":"Received: 25 July 2019 Accepted: 1 October 2019 Conventional concrete is prone to cracking under tensile load, despite its good compressive strength. Recently, biological agents have been applied to heal the cracks in concrete, making concrete structures more serviceable. This paper mainly attempts to evaluate the mechanical properties of bacteria-based self-healing concrete. Two bacteria were selected as the bioagents in concrete, namely, Bacillus subtilis and Bacillus halodurans. The concentration of the bioagents were set to 10~10 cell/mL in water. Then, the two bacteria were applied to cracked concrete to cure the cracks. After curing for several days, the bacteria-based self-healing concrete was subjected to compressive and flexural tests to estimate its mechanical parameters. The results show that the self-healing concretes cured for 14d and 28d had a 7% and 18% higher compressive strength than conventional concrete, respectively; the self-healing concretes cured for 14d and 28d had a 11% and 28% higher flexural strength than the conventional concrete, respectively. Thus, the bioagents could effectively heal the surface cracks on concrete, and make the concrete imperviable.","PeriodicalId":7897,"journal":{"name":"Annales De Chimie-science Des Materiaux","volume":"40 1","pages":"395-399"},"PeriodicalIF":0.8,"publicationDate":"2019-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79534421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Ultrafine Ground Granulated Blast-Furnace Slag (UFGGBFS) and Copper Slag on Ambient Cured Geopolymer Concrete","authors":"V. Rathanasalam, J. Perumalsami, K. Jayakumar","doi":"10.18280/acsm.430603","DOIUrl":"https://doi.org/10.18280/acsm.430603","url":null,"abstract":"Received: 15 August 2019 Accepted: 6 November 2019 This paper explores deep into the effects of mineral admixtures, e.g. ultrafine ground granulated blast-furnace slag (UFGGBFS) and copper slag (CPS), on ambient cured geopolymer concrete (GPC). First, a GPC was prepared from mineral admixtures like the UFGGBFS, fly ash and the CPS, and alkali activators like sodium hydroxide (NaOH) and sodium silicate (Na2SiO3). Then, 10M, 12M and 14M GPC samples were created, with UFGGBFS content of 0%, 5%, 10% and 15%, respectively. These samples were subjected to compressive strength tests, rapid chloride permeability test (RCPT), X-ray diffractometry (XRD) and scanning electron microscopy (SEM). The results show that the GPC samples achieved good compressive strength after 56 days of ambient curing; with the increase of the UFGGBFS content, the porosities and RCPT values of the samples decreased after 180 days of ambient curing; the samples with different mix ratios all showed good performance with the growth in molar concentration. The research results shed new light on the development of eco-friendly alternatives to cementitious GPC.","PeriodicalId":7897,"journal":{"name":"Annales De Chimie-science Des Materiaux","volume":"14 8 Pt 2 1","pages":"377-382"},"PeriodicalIF":0.8,"publicationDate":"2019-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78463119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Role of Heat-Treated Laterite on the Strengthening of Geopolymer Designed with Laterite as Solid Precursor","authors":"Raïssa Charlie Poudeu, Cyprien Joel Ekani, C. Djangang, P. Blanchart","doi":"10.18280/acsm.430601","DOIUrl":"https://doi.org/10.18280/acsm.430601","url":null,"abstract":"Received: 12 July 2019 Accepted: 26 November 2019 This paper aims to develop a low-cost, green construction material for low-income house builders. A series of geopolymer samples were prepared by partially substituting the Cameroonian lateritic soil (LS) with different quantities of heat-treated laterite (20~50 wt. %). The chemical composition of the LS was determined through inductively coupled plasma spectroscopy (ICP). The specimens were subjected to thermogravimetric and differential thermal analyses (TGA/DTA), X-ray diffractometry (XRD) and Fourier Transform Infrared Spectroscopy (FTIR). In addition, the compressive strength of dry and wet specimens was measured with a hydroelectric device. The results show that the geo-polymerization and properties like setting time and mechanical strength of the samples were improved through the combined action of the raw LS and the laterite treated at 500-600°C; the crystallized particles from non-clayed minerals and from aggregates of kaolinite also contribute to strength of the samples; crystalline phases formed a tridimensional skeleton in the microstructure of the geopolymer. The research provides a promising composite that can serve as a low-cost construction material with reduced environmental impact.","PeriodicalId":7897,"journal":{"name":"Annales De Chimie-science Des Materiaux","volume":"50 1","pages":"359-367"},"PeriodicalIF":0.8,"publicationDate":"2019-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78254507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improving the Performance of Solar Air Heater Using High Thermal Storage Materials","authors":"A. R. Abdulmunem, A. Abed, H. Hussien, P. M. Samin, H. A. Rahman","doi":"10.18280/acsm.430605","DOIUrl":"https://doi.org/10.18280/acsm.430605","url":null,"abstract":"1 School of Mechanical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia 2 Ural Federal University Named after the First Persident of Russia B.N.Yeltsin 19Mira str., Yekaterinburg 620002, Russia 3 Electromechanical Engineering Department, University of Technology, Baghdad 10066, Iraq 4 Center of Electrical Energy System, School of Electrical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia","PeriodicalId":7897,"journal":{"name":"Annales De Chimie-science Des Materiaux","volume":"5 1","pages":"389-394"},"PeriodicalIF":0.8,"publicationDate":"2019-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90332983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"In-situ pull-out tests on soil-reinforcement interface properties of reinforced soil slopes","authors":"Cunjia Qiu, Shuangfei Wang, Hong Liu, Jin Huang","doi":"10.3166/ACSM.42.41-56","DOIUrl":"https://doi.org/10.3166/ACSM.42.41-56","url":null,"abstract":"In recent years, geogrid materials have been widely adopted for high fill slopes of airports in mountainous regions, as they can cope with the heavy earth/stonework, high filling height, complex filler properties and diverse topography. The properties of the soilreinforcement interface (SRI) between geogrids and fillers directly bear on the safety of the reinforced structure. To improve the design of reinforced soil structure, it is imperative to determine the SRI properties in in-situ states, disclose the load transmission law, and identify the effective length of reinforcement strip. This paper carries out in-situ pull-out tests on the high fill slopes of an airport, explores the in-situ pull-out properties of geogrids under longterm, large-scale earth/stonework construction, and analyses the variation laws of parameters like strain, stress and displacement under different pull-out forces. Assuming that the relationship between strain and position is an S-curve, the theoretical relationships between these parameters and geogrid position were derived. Through the comparison against the test results, it is proved that the S-curve model outputted basically the same laws with those observed in the tests. The research findings provide a valuable reference for the design of reinforced soil structure. RÉSUMÉ. Ces dernières années, les matériaux de géogrille ont été largement adoptés pour les pentes de remblayage des aéroports dans les régions montagneuses, car ils peuvent supporter des sols lourds et le maçonnage, une hauteur de remplissage élevée, des propriétés de remplissage complexes et une topographie variée. Les propriétés de l'interface de renforcement de sol (SRI en anglais) entre les géogrilles et les matériaux de remplissage ont une incidence directe sur la sécurité de la structure renforcée. Pour améliorer la conception de la structure de sol renforcée, il est impératif de déterminer les propriétés de l'interface de consolidation de sol dans les états in situ, de divulguer la loi de transmission de la charge et d'identifier la longueur effective de la bande de renforcement. Cet article effectue des tests en retrait in situ sur les pentes de remplissage d'un aéroport, explore les propriétés de retrait in situ des géogrilles dans le cadre de la construction à long terme de terres et de maçonnage, et 42 ACSM. Volume 42 – n° 1/2018 analyse les lois de variation de des paramètres tels que la déformation, la tension et le déplacement sous différentes forces de retrait. En supposant que la relation entre la déformation et la position soit une courbe en S, les relations théoriques entre ces paramètres et la position de la géogrille ont été dérivées. La comparaison avec les résultats des tests a montré que le modèle à courbe en S produisait essentiellement les mêmes lois que celles observées dans les tests. Les résultats de la recherche fournissent une référence précieuse pour la conception de la structure de sol renforcée.","PeriodicalId":7897,"journal":{"name":"Annales De Chimie-science Des Materiaux","volume":"19 1","pages":"41-56"},"PeriodicalIF":0.8,"publicationDate":"2018-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84272895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Computational analysis to determine the heat transfer coefficients for SiO2/60EGW and SiO2/40EGW based nano-fluids","authors":"Seshu Kumar Vandrangi, Sampath Emani, K. Sharma, Gurunadh Velidi","doi":"10.3166/ACSM.42.103-114","DOIUrl":"https://doi.org/10.3166/ACSM.42.103-114","url":null,"abstract":"The purpose of the current research is to investigate the computational heat transfer coefficients of SiO2 nanoparticles dispersed in ethylene glycol (EG) and water (W) mixtures in 60:40 (60EGW) and 40:60 (40EGW) by volume and evaluate the influence of base fluid. The thermophysical properties of SiO2, based nanoparticles dispersed in 60EGW and 40EGW base fluid were taken from available literature and regression analysis was performed for formulating equations. The theoretical data was used as input in computational analysis for the investigation of heat transfer coefficients. The results indicate that the heat transfer coefficients for SiO2/60EGW and SiO2/40EGW based nanofluids have shown an enhancement of 25% and 55% respectively when compared with base fluids. Hence, it can be concluded that SiO2/40EGW nanofluids show a better heat transfer rates than SiO2/60EGW nanofluids. RÉSUMÉ. L’objet de la recherche actuelle est d’étudier les coefficients de transfert de chaleur calculés de nanoparticules de SiO2 dispersées dans des mélanges d’éthylène glycol (EG) et d’eau (W) à 60 :40 (60EGW) et 40 :60 (40EGW) en volume, et d'évaluer de fluide de base. Les propriétés thermo physiques de nanoparticules à base de SiO2, dispersées dans un fluide de base 60EGW et 40EGW ont été tirées de la littérature disponible et une analyse de régression a été réalisée pour la formulation d'équations. Les données théoriques ont été utilisées comme entrée dans l'analyse informatique pour l'étude des coefficients de transfert de chaleur. Les résultats indiquent que les coefficients de transfert de chaleur pour les nano fluides à base de SiO2 / 60EGW et de SiO2 / 40EGW ont montré une amélioration de 25% et 55% respectivement par rapport aux fluides de base. On peut donc en conclure que les nano fluides SiO2 / 40EGW présentent un meilleur taux de transfert de chaleur que les nano fluides SiO2 / 60EGW. 104 ACSM. Volume 42 – n° 1/2018","PeriodicalId":7897,"journal":{"name":"Annales De Chimie-science Des Materiaux","volume":"15 1","pages":"103-114"},"PeriodicalIF":0.8,"publicationDate":"2018-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89006362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of viscosity variation and thermal effects in squeeze films","authors":"E. Mamatha, C. Reddy, Rohit Sharma","doi":"10.3166/ACSM.42.57-74","DOIUrl":"https://doi.org/10.3166/ACSM.42.57-74","url":null,"abstract":"Since times immemorial it is known that the application of a material classified as lubricant to two relatively moving surfaces causes motion. The real mechanism of lubrication was explained by Reynolds of the role of lubricants is to support the load between two moving curved surfaces and thus minimizing wear and energy losses reducing friction between them. Thus the proper knowledge and understanding of the process of lubrication becomes a prime necessity to improve standard of design and efficiency of the mechanical system. A study of the behavior of any lubricated system can be best made by developing a mathematical model based on the above factors which depends upon a given a physical situation. The bearing characteristics such as load, flow flux, friction force etc. depends upon the pressure generated in the film and the lubrication process. An attempt has been made to obtain the governing equation for pressure in the lubricant film that are surveyed and summarized in this paper. RÉSUMÉ. Depuis des temps immémoriaux, il est connu que l'application d'un matériau classé comme lubrifiant sur deux surfaces relativement mobiles provoque un mouvement.Le mécanisme réel de lubrification a été expliqué par Reynolds que le rôle de lubrifiants est de supporter la charge entre deux surfaces courbes en mouvement, minimisant ainsi l'usure et les pertes d'énergie, réduisant ainsi les frictions entre elles.Ainsi, la connaissance et la compréhension appropriées du processus de lubrification deviennent une nécessité primordiale pour améliorer les normes de conception et l'efficacité du système mécanique.Une étude du comportement de tout système lubrifié peut être mieux réalisée en développant un modèle mathématique basé sur les facteurs ci-dessus, qui dépend d'une situation physique donnée. Les caractéristiques des roulements, telles que la charge, le flux, la force de friction, etc., dépendent de la pression générée dans le film et du processus de lubrification.Une tentative a été faite pour obtenir l'équation régissant la pression dans le film de lubrifiant qui sont enquêtés et résumées dans le présent document.","PeriodicalId":7897,"journal":{"name":"Annales De Chimie-science Des Materiaux","volume":"56 1","pages":"57-74"},"PeriodicalIF":0.8,"publicationDate":"2018-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73381682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design and fabrication of a forced convection solar dryer integrated with heat storage materials","authors":"Clement Adekunle Komolafe, M. A. Waheed","doi":"10.3166/ACSM.42.22-39","DOIUrl":"https://doi.org/10.3166/ACSM.42.22-39","url":null,"abstract":"The purpose of this study was to designed and fabricated a 10 kg capacity forced convection solar dryer integrated with thermal energy storage materials, TSMA and TSMB, using locally sourced and low-cost materials for drying agricultural products. The dryer consists mainly of a well-insulated solar collector, drying chamber and photovoltaic components. The maximum collector and drying chamber temperatures obtained from three experiments at no-load conditions with two different thermal and without thermal energy storage materials were 86.2, 91.3 and 80.3 C; and 67.8, 70.8 and 54 C respectively, at the corresponding maximum solar radiations of 716.5, 810 and 724.7 W/m. The recorded minimum drying chamber relative humidity of the solar dryer with TSMA, TSMB and without was 27, 24 and 23% respectively, and the corresponding ambient humidity was 70.8, 56.8 and 56.2%. A full load drying process using cocoa beans with TSMA took two full days, 10 hrs (58 hrs) to reduce initial moisture content of cocoa beans from 0.6 to 0.034 g water/g w.b. The maximum drying temperature and thermal efficiency obtained were 54 oC and 48.8% respectively. The dryer was thus viable for drying products within short time with little temperature control mechanism. RÉSUMÉ. Le but de cette étude était de concevoir et de fabriquer un séchoir solaire à convection forcée d’une capacité de 10 kg qui intègre aux matériaux de stockage thermique, TSMA et TSMB, en utilisant des matériaux locaux et à faible coût pour le séchage des produits agricoles. Le séchoir comprend principalement un capteur solaire bien isolé, une chambre de séchage et des composants photovoltaïques. Les températures maximales des capteurs et de la chambre de séchage sont obtenues de trois tests en conditions sans charge avec deux matériaux de stockage thermique différents et sans stockage thermique étaient de 86,2, 91,3 et 80,3 °C; et qui sont respectivement à 67,8, 70,8 et 54 °C aux radiations solaires maximales correspondantes de 716,5, 810 et 724,7 W / m. L'humidité relative minimale enregistrée de la chambre de séchage du séchoir solaire avec TSMA, TSMB et celle sans eux était respectivement de 27, 24 et 23%, et l'humidité ambiante correspondante était de 70,8, 56,8 et 56,2%. Un processus de séchage à pleine charge des grains de cacao avec du TSMA a pris deux jours complets, 10 heures (58 heures) pour réduire la teneur en humidité initiale des grains de cacao 24 ACSM. Volume 42 – n° 1/2018 de 0,6 à 0,034 g d’eau par gramme de poids corporel. La température maximale de séchage et l'efficacité thermique obtenues étaient respectivement de 54 °C et 48,8%. Le séchoir était viable pour sécher les produits en peu de temps avec peu de mécanisme de contrôle de la température.","PeriodicalId":7897,"journal":{"name":"Annales De Chimie-science Des Materiaux","volume":"49 1","pages":"22-39"},"PeriodicalIF":0.8,"publicationDate":"2018-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75149063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modelling of the thermomechanical behaviour of FCC metals under various conditions","authors":"A. Maati, E. Ouakdi, L. Tabourot, P. Balland, M. Demouche","doi":"10.3166/ACSM.42.115-127","DOIUrl":"https://doi.org/10.3166/ACSM.42.115-127","url":null,"abstract":"The main objective of this study is to propose a physics-based modelling adapted to describing the thermomechanical behaviour of metal alloys (specifically FCC metals). This approach takes into account the prominent phenomena generated by plastic deformation. Because of its specific mechanical and physical properties (ductility, lightness, etc.), this study is conducted on 1050 aluminium sheets widely used in sheet metal forming sector. The effect of two opposite and simultaneous physical phenomena on plastic deformation has been highlighted: the strain hardening rules that occurs because of dislocation movements and dislocation multiplication within the crystal structure of the metal and the dynamic recovery governed by thermal activation at intermediate temperatures (T≥0,4Tm). The evolution of two internal state variables (dislocation density and subgrain size) under different loading conditions was investigated. A Fortran program was used to identify the constitutive model parameters. To validate the present model, the curves obtained by numerical method were compared with those obtained by experimental traction data derived from literature. In a wide range of strain rates and temperatures, the obtained results show that the proposed model is effective in predicting the thermomechanical behaviour in traction for FCC metals due to the good agreement between calculated and experimental data. The results show that the strain hardening decrease significantly with increase in temperature and/or decrease in strain rate which explains dominance of dynamic recovery at elevated temperatures. Based on research conducted in the field, some proposals were introduced in the study to contribute to the improvement of numerical results and attempt to expand the use of the model for other types of loading (creep for example whose study is underway). RÉSUMÉ. L'objectif principal de cette étude est de proposer une modélisation phénoménologique à base physique adaptée à la description du comportement 116 ACSM. Volume 42 – n° 1/2018 thermomécanique des alliages métalliques (en particulier les métaux CFC). Cette approche prend en compte les phénomènes dominants générés au cours de la déformation plastique. En raison de ses propriétés mécaniques et physiques spécifiques (ductilité, légèreté, etc.), le métal retenu pour cette étude est l'aluminium 1050 utilisé souvent dans le secteur de mise en forme des tôles métalliques. L'effet de deux phénomènes physiques antagonistes et simultanés sur la déformation plastique a été mis en évidence : l'écrouissage qui est dû aux mouvements et multiplication des dislocations au sein de la structure cristalline du métal et la restauration dynamique gouvernée par l’activation thermique à des températures intermédiaires (T≥0,4Tf). L'évolution de deux variables internes (densité de dislocations et la taille de sous-grain) sous différentes conditions de sollicitation a été étudiée. Un programme Fortran a été utilisé pour identifier les","PeriodicalId":7897,"journal":{"name":"Annales De Chimie-science Des Materiaux","volume":"22 1","pages":"115-127"},"PeriodicalIF":0.8,"publicationDate":"2018-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78970087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of rock mass intactness on tunnel safety and stability in blasting excavation","authors":"Pingyuan Yang, Xiaoen Wu, Junhua Chen","doi":"10.3166/ACSM.42.75-101","DOIUrl":"https://doi.org/10.3166/ACSM.42.75-101","url":null,"abstract":"This paper attempts to make an accurate assessment of the safety and stability of tunnels in blasting excavation, considering the effect of rock mass intactness. For this purpose, numerical simulations and field tests of tunnel blasting excavations were carried out in rocks with different intactness indexes. For simplicity, the multi-hole blasting load was replaced with the equivalent blasting load according to the Chapman-Jouguet (C-J) detonation mechanism and the theory of stress wave propagation in elastic medium. Then, the existing blasting damage model of rock mass was improved into a continuum damage model of rock blasting considering the intactness of rock mass, and imported to FLAC3D for numerical simulations of tunnel blasting excavation. The simulation results were then verified through field tests on blasting vibration velocity and acoustic wave velocity. The attenuation law of blasting vibration was obtained from the tests on blasting vibration velocity, while the blasting-induced fracture zone was determined through the tests on acoustic wave velocity in the borehole before and after blasting. The blasting-induced fracture zone near the explosion sources and the attenuation law of blasting vibration velocity far from the sources were both identified in the numerical simulations and the field tests. After that, the results of the numerical simulations were compared with those of the field tests. The comparison shows that: after the blasting excavation of pressure diversion tunnels, the maximum and the minimum depths of blasting-induced fracture in the surrounding rock respectively appeared at the haunch and the vault of tunnels; when the drilling and blasting parameters remained constant, the maximum depth of blastinginduced fracture and several other factors decreased significantly with the growth of the intactness index; meanwhile, the vibration-influenced distance of blasting increased first and then decreased. The results of numerical simulations agree well with those of the field tests. The research findings provide valuable guidance to blasting excavation of pressure diversion tunnels. RÉSUMÉ. Dans le contexte de l’excavation par dynamitage de tunnels de dérivation de pression dans la centrale hydroélectrique Xi Luodu en Chine, le but de cette étude, c’est de fournir des références à l’évaluation de la sécurité et de la stabilité du tunnel pendant les excavations, à laquelle l’influence de la masse rocheuse devrait être considérée. Pour atteindre ce but, des simulations numériques et des essais sur le terrain d'excavations par soufflage dans des tunnels 76 ACSM. Volume 42 – n° 1/2018 ont été effectués dans les roches avec des indices d'intégrité différents. Visant à simplifier la simulation numérique du dynamitage à trous multiples, une méthode d'utilisation de charges de dynamitage équivalentes pour remplacer la charge de dynamitage à trous multiples a été présentée, selon le mécanisme de donation C-J et la théorie de la propag","PeriodicalId":7897,"journal":{"name":"Annales De Chimie-science Des Materiaux","volume":"142 1","pages":"75-101"},"PeriodicalIF":0.8,"publicationDate":"2018-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86745952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}