Research Papers Geotechnical Engineering

Several code-based equations exist today for design of the minimum transverse reinforcement required in the potential plastic hinge region of prestressed concrete piles.However, the reinforcement requirements of these equations differ drastically in some cases by as much as a factor of three.Each construction or industrial site is unique and requires consideration of specific approaches at the site for decreasing vibration effects of construction activities or industrial dynamic sources on surrounding structures.

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When a failure occurs, geotechnical engineers, engineering geologists, and geophysicists assign its cause to an event that immediately precedes the failure, such as an earthquake, heavy rainfall, flood, or other natural event.

Assigning the failure to the immediate event is misplaced; the metastasis occurred because marginally stable conditions were allowed to exist through substandard investigations by the technical personnel, improper design, and inadequate review by the permitting agency.

The skin friction of pile is found as a parameter of pile shaft displacement.

It will not be a simple/constant values for each type of soil/weathered rock.

It is shown that the energy-based, empirical approach, which is still widely used by practicing engineers, is too crude ...

This paper is a summary compilation of work accomplished over the past decade at NASA’s Kennedy Space Center to understand the interactions between rocket exhaust gases and the soil of the Moon or Mars.After many considerations on adjacent surcharge, it was found that the distribution of lateral surcharge had not accuracy, and the shape and also the magnitude of the lateral pressure were not correct.In this paper besides considering the shape and magnitude ...High vibrations and unacceptable dynamic settlements could disturb sensitive devices and people and even be the cause of structural damage.The dynamic sources, the geology at a site, and the condition of structures affect ground and structure vibrations.The seismic design of foundations for structures depends on dynamic bearing capacity, dynamic settlements and liquefaction susceptibility of soil.The dynamic bearing capacity problem has been attracting the attention of researchers during the last about fifty years.Furthermore, there is no expectation for the ductility capacity of prestressed pile sections in seismic regions, nor do the code-based equations allow the designer to account for a desired ductility when determining the minimum confinement reinforcement in prestressed concrete piles.For this reason, a rational study presented in this report was undertaken to develop an equation that ...The inside diameter of each basin is 60 ft; bottom of the excavation is 32 ft below grade and the excavation retained permanently by concrete secant pile walls.The circular wall is constructed of 3 ft nominal diameter concrete piles overlapping adjacent piles by 6 in; the wall penetrates 60 ft below grade.

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