Increament Evaluation Of The Bearing Capacity Of Bored Piles In clay In Laboratory Conditions

Alinezhad Khorram, Mahmud and Negahdar, Alireza and Abitorabi, Masoud (2014) Increament Evaluation Of The Bearing Capacity Of Bored Piles In clay In Laboratory Conditions. Masters thesis, university of Mohaghegh Ardabili.

Text (ارزیابی افزایش ظرفیت باربری شمع¬های درجا در خاک رسی در شرایط آزمایشگاهی) Mahmud Alinezhad Khorram.pdf Download (803kB)

Abstract

Piles according to implementation method are in different types that can be named as bored piles, driving pile, knocking- casting pile such as Hompress system, Frank shell piles of prestcore type by help of water jet and spiral piles and so on, but the most applicable bored and driving piles are the ones with steel sections. Using piling method for making vibration, noise, and environmental problems in urban places face with limitations; therefore, bored piles are mainly the used choice in these places. In this research first a new method in bored pile implementation is suggested in weak clay that soil beside pile is congested Then To evaluate the performance of this method, sample piles with a diameter of 10 cm and a length of one meter have been executed by in situ and proposed methods and experimental and numerical studies were performed to determine the bearing capacity. After completion of the geotechnical laboratory testing, to determine the load bearing capacity of pile, we used load standard testing according to ASTM-D-1143 standard and the results were recorded as load-subsidence graphs. Using Davison limit method, load bearing of piles were determined and the results show the increased load bearing capacity of 25 to 30% in the piles implemented by the proposed method. Numerical Simulation of study pile was carried out by finite element method using Abaqus software with explicit dynamic process. Only strain control method is used in this model, and the effects of border area in the interface between clay and sand is simulated assigning degrees of freedom and introducing the frictional interaction, The modeling results show 35 percent increase in load bearing capacity. The results of experimental and numerical studies to showed relative improvement in the bearing capacity for the proposed method, therefore development and further studies are recommended to carry piles with real scale

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