Numerical Stability Analysis of Tunnel by PLAXIS

 

Mohammad Hamed Fasihnikoutalab

Department of Civil Engineering, University Putra Malaysia; Serdang, Selangor, Malaysia; e-mail: hfasih@gmail.com

Bujang B. K. Huat

Department of Civil Engineering, University Putra Malaysia; Serdang, Selangor, Malaysia; bujang@eng.upm.edu.my

Afshin Asadi

Department of Civil Engineering, University Putra Malaysia; Serdang, Selangor, Malaysia; afshin.asadi@yahoo.com

Saman Daneshmand

Department of Civil Engineering, University Putra Malaysia; Serdang, Selangor, Malaysia; saman.daneshmand11@gmail.com

ABSTRACT

One of the most significant current discussions in Tunneling is settlement and stability. In recent decade, numerical modeling has been introduced to check the stability and settlement. When the tunnel has been made, stability is an important factor due to advancing cycle and cost especially in soil or weak rock. Study on behavior of surrounding soil and rock at this condition is a great challenging of engineers section, recent development in the field of Finite Element method have led to a renewed interest in the analyses of tunnel stability and prediction of ground movement. The merit is that we can have an appropriate estimation of behavior of soil or rock before drilling and to find out which part of tunnel is under a major settlement risk, especially when the tunnel is drilled into multi layer soils. PLAXIS is one of the most famous software in the field of Finite Element method that can be analysis the behavior of tunnel and the amount of ground movement. According to the calculated thickness of lining, 35 cm thickness observed as optimum thickness of coverage system, based on the analysis the most displacements is obtained in ceiling and floor that is equal to 9.65E-03 meters. The main stress computed in the model plus the lining is -478 kN/m2. Stress is returned to normal status in 13 meters distance from the center of the tunnel.

Keywords: Settlement, Tunnel Stability, Numerical Method, PLAXIS, Axial and Shear forces, Bending moments.

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