Document Type : Original Research Paper

Authors

• H. Bakhshandeh Amnieh ¹
• Amirhossein Rostami ²
• Kurosh Shahriar ³
• Hamid Chakeri ⁴
• Masoud Cheraghi Seifabad ⁵

¹ Associate Professor, School of Mining, College of Engineering, University of Tehran, Tehran, Iran

² Ph.D. Student, Faculty of Engineering, University of Kashan, Kashan, Iran

³ Professor, Faculty of Mining and Metallurgy Engineering, Amir Kabir University, Tehran, Iran

⁴ Assistant Professor, Faculty of Mining Engineering, Sahand University of Technology, Tabriz, Iran

⁵ Associate Professor, Faculty of Mining Engineering, Isfahan University of Technology, Isfahan, Iran

Abstract

Abstract
In the urban tunneling project, one of the most important parameters to be considered is the subsidence level. Metro tunnels are one of the most important urban transportation infrastructures. Due to shallow depth of drilling, the most important factors to prevent the maximum subsidence and subsequent damage of surface and subsurface structures are deformation control and shear forces. The various methods of estimating the subsidence are divided in three categories, namely; Empirical, analytical and numerical methods. In this research, according to the geotechnical conditions of the study area using the data collected from the monitoring during the excavation of twin tunnels of metro by TBM, the empirical methods for the subsidence ( s=A_2+s_max/2 ), the maximum subsidence (s_max=A_1-A_2 ) and the inflection point (ⅈ=x_0 ) are presented by using Boltzmann function for Isfahan twin metro tunnel.

Keywords: Subsidence, Maximum subsidence, Inflection point, Empirical Method, Analytical Method, Numerical Method, TBM.

Keywords

• subsidence
• Maximum subsidence
• Inflection point
• Empirical Method
• TBM

Main Subjects

• Exploration and Mining