Amirkabir University of Technology Amirkabir Journal of Civil Engineering 2588-297X 56 9 2024 11 21 The investigation of the Efficiency of Vacuum preloading in the reclamation of the Weak clay soil Mahshahr Khuzestan Case Study The investigation of the Efficiency of Vacuum preloading in the reclamation of the Weak clay soil Mahshahr Khuzestan Case Study 1147 1162 5528 10.22060/ceej.2024.21628.7780 FA Mohammad Mehdi Pardsouie Iran Shiraz 214315258 Iran 0000-0003-4693-7651 Seyed Mohammad Ali Zomorodian Water Eng. Dept., Shiraz University, 0000-0002-2137-025X Mehdi Mokhberi Department of geotechnical engineering, Estahban Branch, Islamic Azad University, Estahban, Iran Seyed Alireza Nasehi the assistant professor estahban azad university Mohammad Hadi Pardsouie Msc Student islamic azad university estahban Journal Article 2022 07 26 <span style="letter-spacing: .05pt;">Vacuum preloading technology has been widely used all over the world for years. Unfortunately, in Iran, even after years of practical work, the efficiency and functioning of this technology remain unknown. Due to the extensive industrial constructions in the north and south coast of Iran, this technology can play an important role in advancing the overall goals of the project and increasing productivity due to the reduction of construction time and as a result of increasing the productivity of the entire soil improvement system. The use of vacuum pressure in order to increase the efficiency of systems containing surcharge loads and vertical drains is very effective and efficient and reduces the time required to reach the desired degree of consolidation. In this article, first, a summary of the history and basis of operation of vacuum soil consolidation systems is provided, and then the efficiency of this system is shown assuming its use for a practical project. Substrate consolidation of the Mahshahr clarification unit has been selected as a case study in which the project used surcharge along with vertical drains (PVD) for soil improvement. After confirming the model, a vacuum load of 30, 60, and 75 kPa was applied to the model in three states of initial surcharge of 6 meters, reduced surcharge of 3 meters, and no surcharge, and the increase in efficiency was investigated. According to the obtained results, the application of vacuum preloading significantly increases the efficiency both economically and time-wise in the soil improvement system in similar projects. The reduced slag load state of 3 meters and vacuum pressure of 30 kPa were determined as the optimal scenario in this study</span>. <span style="letter-spacing: .05pt;">Vacuum preloading technology has been widely used all over the world for years. Unfortunately, in Iran, even after years of practical work, the efficiency and functioning of this technology remain unknown. Due to the extensive industrial constructions in the north and south coast of Iran, this technology can play an important role in advancing the overall goals of the project and increasing productivity due to the reduction of construction time and as a result of increasing the productivity of the entire soil improvement system. The use of vacuum pressure in order to increase the efficiency of systems containing surcharge loads and vertical drains is very effective and efficient and reduces the time required to reach the desired degree of consolidation. In this article, first, a summary of the history and basis of operation of vacuum soil consolidation systems is provided, and then the efficiency of this system is shown assuming its use for a practical project. Substrate consolidation of the Mahshahr clarification unit has been selected as a case study in which the project used surcharge along with vertical drains (PVD) for soil improvement. After confirming the model, a vacuum load of 30, 60, and 75 kPa was applied to the model in three states of initial surcharge of 6 meters, reduced surcharge of 3 meters, and no surcharge, and the increase in efficiency was investigated. According to the obtained results, the application of vacuum preloading significantly increases the efficiency both economically and time-wise in the soil improvement system in similar projects. The reduced slag load state of 3 meters and vacuum pressure of 30 kPa were determined as the optimal scenario in this study</span>. https://ceej.aut.ac.ir/article_5528_848c4965359e617d5e16c924b4a85fd9.pdf