Shaking table consist of small riffles over which a slurry fine pay dirty is passed. The gold settles into the riffles and through a vibrating action is directed to one side of the table where it is collected. The tails are passed across the middle of the table or remain in suspension. Middlings, material that is partially settled may be collected. Heads and middlings are commonly reprocessed on multi-stage tables. Shaking tables can handle materials from 15 µm to 3.0 mm.
A significant number of cases of damage to piles and pile-supported structures during earthquakes have been observed, but few instrumented records of the response and performance of such structures during earthquakes have been obtained. To expand the database of pile performance during strong shaking, a series of scale model shaking table tests of model piles in soft clay was performed. This research effort had the goals of providing insight into a variety of seismic soil-pile-supestructure interaction (SSPSI) topics, and generating a data set with which to calibrate advanced SSPSI analysis tools being developed at U.C. Berkeley in a parallel effort.
Principles of scale model similitude were used to derive a set of model scaling relationships that recognized the dynamic and nonlinear nature of SSPSI. A specialized flexible wall test container was designed to allow the soil to respond in the same fashion as the free-field, unencumbered by boundary effects. The shaking table reasonably reproduced both one-directional and two-directional input motions, and trends of model site response were consistent with free-field behavior; the motions amplified from base to surface and were coherent across the site. Site characterization included laboratory andin-situ testing to establish the undrained shear strength and shear wave velocity profiles.
One-dimensional equivalent linear dynamic response analyses were successfully used to simulate the model free-field response, indicating that the model soil-container system adequately reproduced free-field site conditions.The vibrating screen is a kind of sieving equipment of international advanced level, developed by our company on the basis of carrying on the advantages of traditional screens and absorbing the outstanding technology from abroad It is widely used for grading and screening materials in the following fields: minerals, quarry, building materials, water conservancy and hydropower, transportation, chemical industry, smelting and so on.
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