View a full description of this report. The following text was automatically extracted from the image on this page using optical character recognition software:. Section 2 Background Before Sandia began its terradynamics program, the problem of penetration mechanics had been studied both analytically and experimentally for over years. However, the technology of penetration mechanics was in its infancy. The most commonly used predictive equations were the Petry equations 2 , based on the earlier Poncelet equations 3.
US20040231552A1 - Kinetic energy cavity penetrator weapon - Google Patents
Standard penetration test - Wikipedia
Zone I of elastic equilibrium 2. Zones II of radial shear state 3. Zones III of Rankine passive state When load qu per unit area acting on the base of the footing of width B with a rough base is transmitted into the soil, the tendency of the soil located within zone I is to spread but this is counteracted by friction and adhesion between the soil and the base of the footing. Due to the existence of this resistance against lateral spreading, the soil located immediately beneath the base remains permanently in a state of elastic equilibrium, and the soil located within this central Zone I behaves as if it were a part of the footing and sinks with the footing under the superimposed load. The depth of this wedge shaped body of soil abc remains practically unchanged, yet the footing sinks.
The standard penetration test SPT is an in-situ dynamic penetration test designed to provide information on the geotechnical engineering properties of soil. This test is the most frequently used subsurface exploration drilling test performed worldwide. The test provides samples for identification purposes and provides a measure of penetration resistance which can be used for geotechnical design purposes. Many local and widely published international correlations which relate blow count, or N-value, to the engineering properties of soils are available for geotechnical engineering purposes.
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