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Geomechanics and Engineering
  Volume 20, Number 2, January25 2020 , pages 87-101

Evaluating the impacts of using piles and geosynthetics in reducing the settlement of fine-grained soils under static load
Mahdi Shariati, Sadaf Mahmoudi Azar, Mohammad-Ali Arjomand, Hesam Salmani Tehrani,Mojtaba Daei and Maryam Safa

    The construction of combined pile-raft foundations is considered as the main option in designing foundations in high-rise buildings, especially in soils close to the ground surface which do not have sufficient bearing capacity to withstand building loads. This paper deals with the geotechnical report of the Northern Fereshteh area of Tabriz, Iran, and compares the characteristics of the single pile foundation with the two foundations of pile group and geogrid. Besides, we investigate the effects of five principal parameters including pile diameter and length, the number of geogrid layers, the depth of groundwater level, and pore water pressure on vertical consolidation settlement and pore water pressure changes over a year. This study assessed the mechanism of the failure of the soil under the foundation using numerical analysis as well. Numerical analysis was performed using the two-dimensional finite element PLAXIS software. The results of fifty-four models indicate that the diameter of the pile tip, either as a pile group or as a single pile, did not have a significant effect on the reduction of the consolidation settlement in the soil in the Northern Fereshteh Street region. The optimum length for the pile in the Northern Fereshteh area is 12 meters, which is economically feasible. In addition, the construction of four-layered ten-meter-long geogrids at intervals of 1 meter beneath the deep foundation had a significant preventive impact on the consolidation settlement in clayey soils.
Key Words
    consolidation settlement; deep foundation; geogrid; pile; pile group; PLAXIS
Mahdi Shariati: 1.) Division of Computational Mathematics and Engineering, Institute for Computational Science,
Ton Duc Thang University, Ho Chi Minh City 758307, Vietnam
2.) Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City 758307, Vietnam

Sadaf Mahmoudi Azar: Department of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran

Mohammad-Ali Arjomand: Faculty of Civil Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran

Hesam Salmani Tehrani: School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran

Mojtaba Daei: Faculty of Civil Engineering, University of Tabriz, Tabriz, Iran

Maryam Safa: Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam

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