Investigation of Excavation Behavior of Construction Reinforced with Soil Nailing in Cohesive and Non-Cohesive Soils

Subject Areas : محاسبات نرم در علوم مهندسی

Mohammad Najafi Salehi ¹ , Sina Fard Moradinia ² , Rouzbeh Dabiri ³

1 - Department of Engineering and Technical – Department of civil. Geotechnical Engineering, Islamic Azad University International Jolfa Branch. Tabriz, Iran
2 - Department of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran
3 - Department if Civil Engineering-Islamic Azad university-Tabriz branch-Tabriz-Iran

Received: 2021-11-08 Accepted : 2022-02-27 Published : 2022-08-23

Keywords: Excavation depth, Adjacent building, Mohr-Columb modulus, Elastic phase, Lateral wall deflection,

Abstract :

Today, heavy traffic and urban transportation problems are the most important problems of big cities. It seems that one of the best ways to reduce these problems is to use underground transportation and urban tunnels. Geotechnical studies are important factors in determining the type, shape and cost of construction of underground structures. In other words, their type, design and construction depend on geological and geotechnical conditions. It should be noted that in many cases there is no suitable land for underground excavations for the construction of underground structures, according to which urban stations must be built within a certain range and it is not possible to change their route to achieve more suitable land. In this research, with the help of PLAXIS software, the wall cavity variable at the northern entrance of Tehran Metro Station No. 6 has been investigated. The effect of soil variables (Mohr-Columb modulus variables), building variables (building width, building distance) and pit variables (pit width and depth) have been investigated. The results showed that the displacement in the longitudinal direction of the pit wall in the consolidation analysis mode increased compared to the amount of displacement in the longitudinal direction of the pit wall in the plastic analysis mode. Also, the maximum internal force is created in the nails of the lower third region.