Prediction of the position and construction procedures response of static and dynamic conditions in the twin tunnel construction

Abstract

Several factors influence the design and construction of twin tunnels, including the distance between the twin tunnels, their location, and the method of construction, among others. Surface and sub-surface structure are affected by tunnel failures. Geotechnical and geological conditions, design, and appropriate construction procedures are the main causes of failures. Understanding the distributions of various stresses on tunnels is important for tunnel stability. After construction, the findings of static and dynamic analysis were concentrated at (stress and displacement). To analyze the behavior of position and construction process of twin tunnels, a series of three-dimensional numerical analysis were performed. New geotechnical software called MIDAS GTS NX (v. 2015) was utilized to model the twin tunnel. Collecting data from a variety of studies on this issue that have been done by prior authors. Linear elastic behavior is one of a well-known method of tunnel analysis and modeling that assumes the material is linear, isotropic, and homogenous. Usually, the first tunnel (for example, the upper tunnel) is construct first, followed by the second. The present study is a particular case, both twin tunnels were excavated at the same time. The purpose of this research is to compare the impacts of tunnel position and construction procedure on the tunnel structure and surrounding ground.