Minimizing of tunneling effect on existing infrastructure in Egypt

Abstract

The construction of two closely distant tunnels under an existing tunnel can cause greater deformation for the existing tunnel and the ground due to the dual disturbances caused by the tunneling process (Jin, Yuan, Li & Zheng, 2018). Several studies have estimated the ground movements as well as the deformation has induced in the existing tunnels by the construction of a new tunnel (Fang, Zhang, Li & Wong, 2015; Zhang, Liu, Kang, Zhong & Chen, 2018; Lin, Chen, Wu & Cheng, 2019). Grout technology is widely used for strengthening the soil and protecting the existing structures in shield tunneling. Li, Zhang and Yuan (2013) presented the case of using jacking as the tunnel protection methodology in case of the tunnel excavation under the existing one. Kimpritis, Smon, Pandrea and Vukotic (2014) explained how jet grouting could be used as the integral part of the complex tunneling projects. They summarized the basic framework for the design and execution of jet-grouting in tunneling. In this research, the case history of the intersection of Al-Azhar twin tunnel with the CWO sewer is idealized using the three-dimensional numerical model. Consequently, in this study, a series of parametric studies are conducting by utilizing the verified model of the case history to evaluate the effect of other different protection techniques. The key part of this paper is to investigate the best configuration technique to minimize the tunneling effect on an adjacent structure. PRACE ORYGINALNE ORIGINAL PAPERS