Brief Comments on “Unloading Rock Mechanics” and Engineering Applications

Abstract:

Since rock masses are not a true continuous, homogeneous, isotropic and linear-elastic (CHILE) continuum, the loading and unloading behaviors differ greatly from each other. Professor Ha Qiulin and his co-workers have demonstrated that strength and deformational characteristics, initial rock stresses, scale effects, creep, deformation and fracture patterns are quite different and stress path dependence is particularly emphasized. As engineering unloading of the rock mass is essentially of a dynamic nature by excavation, we will first discuss the excavation process and related stabilization techniques. For the complex stress and deformation conditions around the excavated boundaries, it seems rational to define an excavation disturbed zone (EDZ) as in the last decades. In tunnel excavation, temperature and ventilation effects should be also taken into account. Space-and-time dependence on tunnel behaviors is important. Finally, further research topics are discussed.

• Periodical: Applied Mechanics and Materials (Volumes 256-259)
• Pages: 211-214
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.256-259.211
• Online since: December 2012
• Authors: Bao Yun Zhao, Ke Shan Zhu
• Keywords: Discontinuity, Excavation, Rock Engineering, Unloading

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