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http://dx.doi.org/10.9720/kseg.2013.3.283

Analysis of the Stability and Behavior of a Calcareous Rock Slope During Construction of a Tunnel Entrance  

Song, Young-Suk (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources)
Yun, Jung-Mann (Dept. of Construction Information System, ShinAnsan University)
Publication Information
The Journal of Engineering Geology / v.23, no.3, 2013 , pp. 283-292 More about this Journal
Abstract
A calcareous rock slope failed during excavation of the slope for construction of a tunnel entrance. The slope is located at the construction site for widening highway in Yeongwol, Korea. Field surveys, laboratory tests, and numerical analyses were performed to determine the reason for the slope failure. The numerical analysis revealed that the safety factor of the slope before construction of the entrance was less than 1, and that this decreased after construction. After construction of the entrance, the sliding zone of the slope increased and slope stability decreased because the shear strain and plastic zone in the slope over the tunnel entrance showed an increase relative to the lower part of the slope. To enhance the stability of the slope for construction of the tunnel entrance, countermeasures such as rock bolts, rock anchors, and FRP (Fiber glass Reinforced Plastic) grouting were adopted in light of the field conditions. Serial field monitoring performed to confirm the reinforcing effects of the adopted countermeasures revealed a small amount of horizontal deformation of the slope soils, most of the elastic deformation that can regain its former value. In addition, the axial forces of the rock bolt and anchor were more strongly affected by slope excavation during construction of the tunnel entrance than by tunnel excavation or the rainy season, and the axial forces tended to converge after excavation of the tunnel. Therefore, we can confirm that the slope is currently safe.
Keywords
Slope failure; Calcareous rock slope; Slope reinforcement method; Numerical analysis; Field monitoring;
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