Experimental study of groutability of Super-Micro cement
Based on the similarity theory and the theory of model test, we simulate different opening rock fractures indoors. On account of Super-Micro cement with four different water cement ratios of 0.8, 1.0, 1.5, 2.0 under different water reducer and additive, the experiment is testing the passing rate of Super-Micro cement through the filter with diameters of 0.02mm, 0.05mm, 0.07mm. The test results indicate that the ultimate limit viscosities are 17.1mPa.s, 33.6mPa.s and 624.7mPa.s respectively when the superfine cement passes these three filtrations. After analyzing the influence of grout viscosity on passing rate, that is to say, the bigger the viscosity, the smaller the crack width.
Dam Foundation Grouting
\IDam Foundation Grouting\N provides its readers with background information that will help them deal more confidently and effectively with the design, supervision, and review of grouting practices. It presents a current overview and critical review of grouting practices in the U.S., while going beyond other grouting sources to discuss experiences in the international grouting arena. Avoiding heavy doses of theory, this book concentrates on the practical issues of dam foundation grouting such as: 1) Design considerations; 2) materials and mix design; 3) factors affecting grouting effectiveness; 4) equipment; 5) standard procedures; 6) supervision and inspection of grouting; 7) documentation of operations; and 8) quality assurance. Dam engineers, dam construction engineers, grouting supervisors and inspectors, field personnel of dam safety reviewing agencies, and engineering students will all benefit from this book. \IDam Foundation Grouting\N also offers an extensive list of references which will guide readers to additional sources of information on the subject.
Enregistrement des parametres de forage: Nouveaux développements
RésuméLes améliorations technologiques des techniques d'enregistrement vont élargir considérablement les utilisations des forages destructifs avec enregistrement des paramètres en tant que moyen de reconnaissance des sols sur terre ou en mer. Les enregistreurs numériques récents décrits dans cet article enregistrent jusqu'à 8 paramètres sur cassettes magnétiques. L'ordinateur, à partir de ces cassettes, permet de créer un nombre illimité de diagrammes, analyses statistiques et interprétations diverses des données enregistrées. Plusieurs exemples d'emploid sont présentés. On verra que la méthode se prête aussi bien à une analyse géologique précise quà un objectif aussi pratique que la détermination du niveau de refus de gros pieux battus en site marin.SummaryTechnological improvements in the recording techniques will considerably widen the uses of the destructive drilling with drilling parameters recording as a major means of on-shore and off-shore soil investigations. The recent numerical recorders which are described can record up to 8 parameters on magnetic tapes. From the digital recording, the computer allows an unlimited number of graphs, statistical analyses, and various interpretations of the recorded data to be presented. Several examples are described of the use of the method. It appears that precise geological studies as well as such a practical work as the determination of the level of refusal of large off-shore driven piles can be easily performed by use of parameters recordings computer processing.