The cone pressuremeter is an in situ testing device comprising a pressuremeter mounted behind a cone penetrometer of the same diameter. Previously reported tests had indicated that the cone pressuremeter can provide measurements of soil strength, stiffness and in situ stress. The study presented in this thesis is aimed at developing methods of interpretation of the cone pressuremeter that can be applied with confidence to a variety of soil types. Carbonate sands have been the cause of significant problems associated with the design of foundations for offshore structures. A programme of cone pressuremeter testing in a carbonate sand from the west coast of Ireland is presented. Tests were carried out in a calibration chamber where conditions of vertical and horizontal stress and relative density were controlled. The influence of these parameters on measured values of cone resistance and pressuremeter limit pressure is assessed. Similar tests were also carried out in a felspathic sand, and correlations have been presented for deriving horizontal stress and relative density that are applicable to most types of sand. The influence of creep strains and of overconsolidation were other features of carbonate sand that have been assessed with the cone pressuremeter. A numerical model which accounts for the crushing characteristics of carbonate sand is presented, and is shown to improve significantly predictions of limit pressure measured in the calibration chamber. Cone pressuremeter tests were carried out in soft clay at the Bothkennar test site in Scotland. An analysis based upon cavity expansion theory was shown to provide good estimates of undrained shear strength and stiffness compared with results from other in situ and laboratory tests. Estimates of the in situ horizontal stress were found to be unrealistically high. Shear modulus in both sand and clay has been measured from unload-reload cycles carried out during pressuremeter expansion. The stress levels and strain amplitudes of these cycles have been shown to influence the shear modulus greatly. In sand, a procedure for relating these moduli to those at an extremely small reference strain is presented. In clay, shear moduli are shown to give a remarkably close agreement to others reported from Bothkennar, when due account of the strain amplitude is made. Finally, a time/cost analysis between the cone pressuremeter, the cone penetrometer and the self-boring pressuremeter is presented. The cone pressuremeter is found to be a cost-effective device bearing in mind the amount and quality of information it can provide.

The cone-pressuremeter is a new site investigation device which incorporates a pressuremeter behind a standard cone penetrometer tip. This dissertation is concerned with an understanding of the new device, and in particular the establishment of a detailed procedure to allow the test to be used to determine the engineering properties of cohesionless soils. A series of 34 calibration tests was performed, in which three cone-pressuremeter prototypes with cross-sectional areas corresponding to 15cm², 10cm² and 5cm² were used. The tests were carried out on cylindrical samples, enclosed in a chamber 1.0 m in diameter and 1.5 m in height. Stress controlled boundaries allowed independent control of vertical and horizontal stress in the range of 50 kPa to 300 kPa. A raining deposition technique was used to produce three sand densities, corresponding to loose, medium and dense samples. A programme of calibration was designed to provide an examination of the influence of relative density, stress level and stress ratio on cone-pressuremeter test data. Soil properties were related to the values of the limit pressure obtained from the pressuremeter test and the cone resistance values from the cone test. Empirical relationships were proposed for deriving density, friction angle and horizontal stress. Cone-pressuremeter tests were used for assessing directly the shear stiffness of the soil. A series of calibrations was needed to obtain the best possible estimation of the unload-reload shear modulus. Interpretation of the measured modulus was made by examining appropriate methods of calculating the modulus from unload-reload loops. Strain arm measurements and volume change measurements were compared. A method has been presented that allows the shear modulus values to be correlated to the relevant stress level acting around the pressuremeter during the test. The values of shear modulus obtained with the cone- pressuremeter were compatible with those obtained from the self-boring pressuremeter. An assessment of chamber size effects yielded useful information regarding the applicability of test correlations derived from calibration chambers to field problems. An additional study identified experimentally the influence of length to diameter ratio on the pressuremeter pressure-expansion curve.

Submitted by Patrícia Valim Labres de Freitas (patricial) on 2016-03-16T15:48:14Z No. of bitstreams: 1 Juliane Luchese_.pdf: 2295311 bytes, checksum: 55706fd6328fe1f0f72ca1f58af46674 (MD5) / Made available in DSpace on 2016-03-16T15:48:14Z (GMT). No. of bitstreams: 1 Juliane Luchese_.pdf: 2295311 bytes, checksum: 55706fd6328fe1f0f72ca1f58af46674 (MD5) Previous issue date: 2016-01-22 / Nenhuma / As decisões tomadas em relação à escolha das dimensões competitivas, da estrutura e da infraestrutura, juntamente com as capacidades organizacionais, são a base para a construção de uma estratégia de produção competitiva, e uma forma de diferenciação das empresas perante seus concorrentes. Neste contexto, este estudo se propõe a identificar quais são as principais dimensões competitivas que orientam a estratégia de produção das grandes empresas da indústria moveleira do polo de Bento Gonçalves- RS sob a percepção dos gerentes de produção das mesmas. Para que seja possível alcançar o objetivo principal, foi definido alguns objetivos específicos tais como como: a) analisar o comportamento estratégico em relação as dimensões de competição das quatro empresas fabricantes de móveis de grande porte de Bento Gonçalves; b) Identificar e analisar as prioridades quanto as dimensões competitivas enfatizadas pelas empresas bem como identificar como cada empresa está estruturada em relação as áreas de decisão estruturais e infra estruturais; c) identificar sinergias e trade-offs entre as principais prioridades atribuídas nas quatro empresas. A abordagem metodológica adotada foi o estudo de caso múltiplos aplicado no principal polo moveleiro do Rio Grande do Sul, o polo da Serra Gaúcha. A escolha deste polo ocorreu devido a sua importância na geração de empregos e por sua representatividade no mercado em que essas organizações estão inseridas. Como resultado, a pesquisa evidenciou similaridade entre três empresas pesquisadas quanto a escolha das dimensões competitivas destacando a importância para as dimensões: entregas quanto a pontualidade, flexibilidade de volume, qualidade, entregas quanto a velocidade, flexibilidade de design e tecnologia de processo. Ademais, a pesquisa pretendeu servir de suporte aos gestores das pequenas e médias empresas e pesquisadores para compreender sobre a estratégia de competição em relação as dimensões competitivas adotadas pelas empresas moveleiras de grande porte. / The decisions regarding the choice of the competitive dimensions of the structure and infrastructure, along with the organizational capabilities are the foundation for building a competitive manufacturing strategy, and a way to differentiate the company to its competitors. In this context, this study aims to identify what are the main competitive dimensions that guide the production strategy of large companies in the furniture industry in Bento Gonçalves- RS, under the same perception of the production managers. To be able to achieve the main goal was set some specific goals such as :a) analyze the strategic behavior regarding the dimensions of competition of the four major furniture manufacturers of Bento Gonçalves; b) Identify and analyze the priorities for the competitive dimensions emphasized by the companies as well as identify how each company is structured in relation to the structural and infrastructural decision areas; c) identify synergies and trade-offs among the top priorities assigned in the four companies. The methodological approach adopted was the multiple case study applied in the main furniture center of Rio Grande do Sul, the center of Serra Gaucha. The choice of this center was due to its importance in the employment generation and its share of the market in which those organizations are located. As a result, the survey showed similarity between the three companies surveyed as the choice of competitive dimensions highlighting the importance for dimensions: punctuality deliveries, volume flexibility, quality, speed delivery, design flexibility and process technology. Furthermore, the research intended to provide support to small and medium companies’ managers and researchers to understand the competition strategy on the competitive dimensions adopted by large furniture companies.

The static cone penetration tests are quite extensively used for carrying out in-situ geotechnical investigations both for onshore and offshore sites especially where the soil mass is expected to comprise of either soft to medium stiff clays or loose to medium dense sands. The wide use of the cone penetration tests (CPT) in geotechnical engineering has resulted in a great demand for developing necessary correlations between the cone penetration resistance and different engineering properties of soils. The successful interpretation of the cone penetration test data depends mainly on the various empirical correlations which are often derived with the help of a controlled testing in calibration chambers. The calibration chambers have been deployed in various sizes (diameter varying from 0.55 m to 2.10 m) by a number of researchers. It is quite an expensive and time consuming exercise to carry out controlled tests in a large size calibration chamber. The task becomes even much more difficult when a sample comprising of either silt or clay has to be prepared. As a result, most of the reported cone penetration tests in calibration chambers are mainly performed in a sandy material. Taking into account the various difficulties associated with performing tests in large calibration chambers, in the present study, it is attempted to make use of a miniature static cone penetrometer having a diameter of 19.5 mm. This cone was gradually penetrated at a uniform rate in a triaxial cell in which a soil sample of a given material was prepared; the diameter of the cone was intentionally chosen smaller so that the ratio of the diameter of the cell to that of the cone becomes a little larger. Two different diameters of the cells, namely, 91 mm and 140 mm, were used to explore the effect of the ratio of chamber (cell) size to that of the cone size. In addition, the rate of penetration rate was also varied from 0.6 mm/minute to 6.0 mm/minute (the maximum possible rate for the chosen triaxial machine with the larger cell) to examine the effect of the rate of the penetration of the miniature cone on the tip resistance. By using the chosen experimental setup, a large number of static miniature cone penetrometer tests were carried out on four different materials, namely, (i) clean sand, (ii) sand with 15% silt, (iii) sand with 25% silt, and (iv) sand with 15% fly ash. The cone tip resistance for each material was obtained for a wide range of three different relative densities. The effective vertical pressure (σv) for the tests on different samples was varied in between 100 kPa and 300 kPa. The variations of the tip resistance with axial deformation in all the cases were monitored so as to find the magnitude of the ultimate tip resistance. In contrast to the standard cone, the diameter of the piston shaft was intentionally kept a little smaller than that of the cone itself so as to restrict the development of the piston resistance. For each cell (chamber) size, two different sizes of the pistons were used to assess the resistance offered by the penetration of the piston shaft itself. It was noted that the resistance offered by the chosen piston shaft is not very substantial as compared to that of the cone tip itself. Most of the experimental observations noted from the present experiments were similar to those made by the penetration of the standard size cone in a large calibration chamber. The ultimate tip resistance of the cone was found to increase invariably with an increase in the magnitude of σv. An increase in the relative density of the soil mass leads to an increase in the value of qcu. For the same range of relative densities, an addition of fly ash in the sample of sand, leads to a considerable reduction in the magnitude of qcu. Even with the addition of 25% silt, the values of qcu were found to become generally lower as compared to clean sand and sand added with 15% silt. An employment of a larger ratio of the diameter of the cell to that of the miniature cone leads to an increased magnitude of qcu. An increase in the penetration rate from 0.6 mm/min to 6.0 mm/min, was found to cause a little increase in the magnitude of qcu especially for sand added with fly ash and silt. The effect of the penetration rate on the results was found to increase continuously with a reduction in the rate of penetration. At higher penetration rates, in a range closer to those normally employed in the field (20 mm/sec), it is expected that the rate of penetration of the cone will not have any substantial effects on the magnitude of qcu for clean sands. The magnitude of qcu obtained in this thesis at different values of σv for all the cases with the use of the miniature cone were compared with the two widely used correlations in literature. It is found that except for dense sands, in most of the cases, the present experimental data lie generally in between the two correlation curves from literature; for dense sands the measured values of qcu were found to be significantly lower than the chosen correlation curves. It was noted that with the use of the miniature cone penetrated in a given sample prepared in a triaxial cell, it is possible to obtain reasonably an accurate estimate of the tip resistance of the standard cone especially for loose to medium dense states of all the materials. Further, from the analysis of all the tests results, it was noted that approximately a linear correlation between qcu/σv and soil friction angle (φ) for different chosen materials exists provided the dependency of the φ on the stress level is taken into account. As compared to the standard cone penetrometer which is usually employed in the field, the miniature cone used in this study is expected to provide a little conservative estimate, of the tip resistance of the standard static cone penetrometer with reference to the different materials used in this study on account of the facts that (i) there is a reduced area behind the cone, (ii) the ratio of the diameter of the calibration chamber (cell) to that of cone is not very high, (iii) the chosen size of the cone is smaller than the standard cone, and (iv) the chosen penetration rate is much smaller than the standard rate of penetration. Further, in the case of clean sand, an attempt has also been made in this thesis, with the help of a number of direct shear tests at different stress levels, to generate an expression correlating peak friction angle, critical state friction angle, relative density of sand and vertical effective stress. A correlation has been generated with the help of which, the value of peak dilatancy angle can be obtained from the known values of peak friction angle and critical state friction angle. In confirmation with the available information in literature, this exercise on clean sand has clearly indicated that a decrease in the magnitude of vertical effective stress leads to an increase in the values of both peak friction angles and peak dilatancy angles.