Geotechnical Monitoring Articles
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The Use of a Centrifuge in Geotechnical Engineering Education
Geotechnical centrifuges have been seen to date principally as research machines. A role is now suggested in which centrifuges of modest size and cost can contribute usefully to the education and training of geotechnical engineers in college laboratories. One such machine, which has been used in teaching for 15 years, is described, and examples of the results of a series of simple demonstrations ...
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The Influence of the Shape of a Pile Shoe on a Model Pile Penetrating Layered Soil
This is an account of a small-scale model study to examine the influence of the shape of pile shoes on the behavior of piles. A model pile 32 mm diameter was driven at a constant rate of penetration into sand overlying a layered clay in a container and with four different shapes of pile shoes. The test results indicate that the load penetration curves assume constant values in the sand and the ...
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Dynamic Behavior of the Bumpy Road Shaking Table System
Vibration tests were performed on the “bumpy road shaking table” system at the Cambridge University Geotechnical Centrifuge to investigate its dynamic behavior under operating conditions. In these tests, steel plates of known weights were fastened onto the base of the model container. The container was then subjected to “earthquake motions” simulated by the shaking table system and the ...
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The Use of Hall Effect Semiconductors in Geotechnical Instrumentation
For the past five years or so Hall effect semiconductors have been increasingly used in the geotechnical engineering laboratories at the University of Surrey. They have been incorporated as sensing elements in local radial and axial strain measuring devices, for the small-strain instrumentation of triaxial specimens, and in small diameter boundary normal and shear stress cells. Triaxial internal ...
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The Vane Cone: A New Device for Soil Shear Strength Measurement
A considerable number of in-situ tests have been devised for measuring field soil shear strength parameters. These tests include, among many others, cone penetration and vane shear devices. The conventional form of each of these two devices controls the type of soil deformation, which may limit the use of the measured soil shear resistance data. In this study both vane and cone devices were ...
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Design of Laterally Loaded Driven Piles Using the Flat Dilatometer
The nonlinear subgrade reaction method (P-y curves) is widely used for the design of laterally loaded piles. This method replaces the soil reaction with a series of independent nonlinear Winkler springs.A preliminary semi-empirical approach for the determination of P-y curves using data obtained from a flat dilatometer test (DMT) is presented and evaluated. A brief description of the equipment, ...
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