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Weathering Sensitivity Characterization for Rock Slope, Considering Time Dependent Strength Changes  

Lee Jeong-Sang ((주)지오제니컨설턴트)
Bae Seong-Ho ((주)지오제니컨설턴트)
Yu Yeong-Il ((주)삼보기술단)
Oh Joung-Bae ((주)삼보기술단)
Lee Du-Hwa ((주)삼보기술단)
Park Joon-Young ((주)지오제니컨설턴트)
Publication Information
Tunnel and Underground Space / v.16, no.2, 2006 , pp. 109-134 More about this Journal
Abstract
Rocks undergo weathering processes influenced by changing in pressure-temperature condition, atmosphere, underground water, and rainfall. The weathering processes change physical and chemical characteristics of the rocks. Once the rocks are weathered, the characteristics of them are changed and, because of the changing, several disadvantages such as rock slope failures and underground water spouts are can occur. Before we cut a large rock slope, therefore, we must analyze current weathering conditions of rocks and predict weathering processes in the future. Through the results of such analyses, we can judge reinforcement works. In order to comply with such requests, chemical weathering sensitivity analysis which was analyzed from chemical weathering velocities and other characteristics of rocks has been applied in several prior construction works in Korea. But, It is defective to use directly in engineering fields because it was developed for soils(not rocks), it has too mny factors must be considered and the relationships between the factors are not clear, and it is hard to explain the weathering processes in engineering time range. Besides above, because it has been used for isotropic rocks, this method is hard to apply to anisotropic rocks such as sedimentary rocks. Acceding to studies from morphologists (e.g. Oguchi et al., 1994; Sunamura, 1996; Norwick and Dexter, 2002), time dependent strength reduction influenced by weathering shows a negative exponential function form. Appling this relation, one can synthesize the factors which influence the weathering processes to the strength reduction, and get meaningful estimates in engineering viewpoint. We suggest this weathering sensitivity characterization method as a technique that can explain time dependent weathering sensitivity characteristics through strength changes and can directly applied the rock slope design.
Keywords
weathering sensitivity; Time dependent strength change; strength reduction coefficient rock slope; sedimentary rock;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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