Geotechnical Engineering - Assignment
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Added on 2021-05-31
Geotechnical Engineering - Assignment
Added on 2021-05-31
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Geotechnical Engineering 1GEOTECHNICAL ENGENEERINGBy NameCourseInstructorInstitutionLocationDate
Geotechnical Engineering 2Analytical Modelling Of Helical Pile Foundation Systems for Renewable Energy ApplicationsThe installation of helical piles is carried out by applying torque to the pile head. This application has spread greatly in the recent years. This is due to their intrinsic advantages of installation that occurs rapidly over a short period of time with reduced vibration and noise, and it develops a very powerful hydraulic driving heads. The helical piles have the ability to be installed in areas with restricted hence they are the most preferred in foundation underpinning works. They also have high efficiency due to their ability to resist pullout and compression forces and they can be installed rapidly and loaded immediately (Livneh & Naggar, 2008). Studies and research done on the conduct of helical piles mounted in soil with fine texture show that the effects of installation do not affect the strength of the remolded cohesive soils. The research has however been done on only on the model of helical piles that are installed in the remolded materials and not the deposits of natural soil. Authors and researchers Bagheri and Naggar carried out studies on the impacts of disturbance of installation on the conduct of multi-helix piles in structured clays and they pointed out that driving piles into the cohesive soil yields a large amount of pore pressure inside the pile vicinity. At the point when the installation is done, the pressures of the pore begin to progressively dissipate. This allows for the soil that is around the pile to consolidate. At the period when the pile is consolidating, the soil, the strength of the soil shear as well as the pile bearing capacity tends to increase gradually (Byrne & Houlsby, 2015). They further reported that the results for the load tests of a pile that is driven into soft clay resulted to an increase in the bearing capacity of the pile.Recent research work carried out by Samuel, Jonathan and Charles have identified that Helical screw piles have become a commonly used solution for the relatively low capacity, recyclable foundations that support rail and road signage and any other similar structures. They
Geotechnical Engineering 3also pointed out that past studies on the behavior of helical piles in clay soils have mostly specified on the behavior of multi-helix screw piles that are loaded axial compression or the tension that has got a varying length of embedment (Cerato & Victor, 2009). When investigating the effect of the number of helical plates on the ultimate capacity in clay when using helical screw models that have a diameter of 75mm in a bed of clay, it was realized that the number of helical plates over a preset length of helical screw pile did greatly have an influence on the stiffness and capacity of the feedback from the piles. From this investigation, they were able to make a realization and hence a deduction that the highest capacity was attained when the spacingratio was rated from 1.0 to 1.5. from a samples of data from field tests carried out on the capacityof uplift for the helical screw piles in clay when comparing them to the estimated capacities when using cylindrical failure as well as the individual capacities of plate bearing mechanisms, the study showed that in case of a failure mechanism that is assumed in design, it should at all point rely on the spacing ratio (El Naggar & Abdelghany, 2013). The researchers carried out their investigation by employing particle image velocimetry and transparent synthetic soil in order to make an observation of the failure of helical screws that have a spacing ratio of from 1.5to 3.0 on the helical plate and also with an active length that is triple its diameter.The most currently used screw piles are mostly made of steel of high strength and they doconsist of helices that are normally fixed to the shaft at some specific spacing and they also have a pointy toe in order to allow for better and easier installation to the ground. The use of helical piles has in the recent days been developed to structures that are subjected to lateral and compressive loading (El Naggar et al, 2012). Helical screw piles offer some structural resistance to tensile, lateral and compressive forces that come along with overturning moments. Researchers Abbas Mohajerani, Dusan Bosnjak, and Damon Bromwich determined that the
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