Deformation analysis of surge chamber cavern using phase 2-RS2
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Date
2016-06
Authors
Chik Kein Yang
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Abstract
Rock deformation is one of the geotechnical problems that has to be taken into consideration by engineers in the design of underground structures as the extent of displacement when rock strains in response to unloads on excavation can have adverse effects on the structural stability. In present work, effect of different cavern shape in response to in-situ stresses was studied. Stress analysis and deformation analysis of original D-shape, half-dome roof, circular, rectangular, two half-dome, egg-shaped, horseshoe and bullet shape cavern were conducted using both RS2 and RS3 based on geological data acquired via field investigation and rock mass properties analyzed using RocData in the first place. The findings from analyses substantiated the correlation between shape of cavern and stress distribution as well as the relationship between shape of cavern and total displacement. The stress analyses showed that stress was distributed uniformly on arched profile and flatness of arch profile could affect the magnitude of stress acting on it. It was found out that straight-sidewalls caverns were more susceptible to deflection and curved-sidewalls caverns were more resistant to displacement from deformation analyses. These analyses revealed that circular cross-section was the most geotechnically suitable design but horseshoe cross-section is the more economically feasible design.