Modeling the Deformation of Tunnel Excavations in Layered Rock Masses

 

Hui Yang

Lecturer (Dr.), School of Civil engineering and mechanics,
Central South University of Forestry and Technology, Changsha 410083, China
e-mail: yanghuilkd@126.com

Xueliang Jiang*

Associate Professor, School of Civil engineering and mechanics, Central South University of Forestry and Technology, Changsha 410083, China
* Corresponding author
e-mail: jiangxuelianglkd@126.com

Changping Wen

School of Civil engineering and mechanics, Central South University of Forestry and Technology, Changsha 410083, China

Jiang Yin

School of Civil engineering and mechanics, Central South University of Forestry and Technology, Changsha 410083, China

 

 ABSTRACT

Tunnel excavations are often constructed in stratified rock mass. The stratification in a rock mass is generally characterized by its planar geometry and persistence. So tunnel design through stratified rock mass requires the consideration of a variety of failure mechanisms. Due to the preferred fabric orientation or the existence of non-random discontinuity, anisotropic behavior of rock masses should be fully accounted for in the analysis. Significant errors may be introduced into the analysis by treating the anisotropic rocks as if they were isotropic materials. This paper uses the finite difference method to model tunnel excavation construction in stratified rock mass. To demonstrate the sensitivity of stratified rock mass structure on numerical modeling results, the influence of the side-pressure coefficient K on stratified rock mass stability is explored in this research. Moreover, displacement distribution and stress are studied as well.

Keywords: tunnel excavation; deformation behavior; numerical analysis; finite difference method

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