Joint Controlling Effect on Stability of Surrounding Rock in Horseshoe-Shaped Underground Opening

Abstract:

This paper presents a numerical study on the mechanical behavior of the jointed rocks around the underground opening. By comparing different obliquities and the different locations of the joint, its controlling effect on stability of surrounding rock is evaluated in terms of the shear stress distribution, displacement distribution and the plastic zone pattern, which are induced by underground excavation. The results clearly indicate that, the maximum shear stress occurs mainly near the corner of the opening and the joint plane. When the joint inclination angle is less than 60º, the maximum vertical displacements occur where the joint locates near the skewback. Once the joint inclination angle reaches at 75º, the maximum vertical displacements occur where the joint is through the cross section of the underground opening. The plastic zone reaches minimum at the joint inclination angle of 45º where the joint locates either near the skewback or near spandrel of the opening, while it reaches minimum at the joint inclination angle of 60º where the joint cuts through the cross section of the opening.

• Periodical: Applied Mechanics and Materials (Volumes 170-173)
• Pages: 1643-1647
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.170-173.1643
• Online since: May 2012
• Authors: Lu Wang Chen, Yuan Qin, Jiang Hong Chen, Shi Lei Zhang
• Keywords: Horseshoe-Shaped Underground Opening, Joint, Joint Inclination Angle, Location, Stability of Surrounding Rock

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