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A Case Study on Stochastic Fracture Network Modeling for Rock Slopes of Busan-Ulsan Highway(Reach 5)  

Heo, In-Sill (GeoScan, Co., Ltd.)
Um, Jeong-Gi (Dept. of Environ. Explo. Engineering, Pukyong National University)
Kim, Yang-Phil (Dept. of Space Design, Ulsan College)
Kim, Kook-Han (Korea Highway Corporation)
Lee, Young-Kyun (Daelim)
Publication Information
The Journal of Engineering Geology / v.16, no.4, 2006 , pp. 337-349 More about this Journal
Abstract
Seven hundred and fifty one fractures of the rhyolitic tuffaceous rock masses were mapped using 6 scanlines placed on rock slope exposures that were within 8.02 km of Busan-Ulsan highway. These data were analyzed to find the number of fracture sets that exist in the rock slopes and the probability distributions of orientation, spacing, trace length and fracture size in 3-D for each of the fracture sets. All the fracture set orientation distributions exhibit high variability. The Fisher distributions were found to be unsuitable to represent the statistical distribution of orientation for most of the fracture sets. The probability distributions, gamma, exponential and lognormal were found to be highly suitable to represent the distribution of spacing and semi-trace length of fracture sets. In obtain-ing these distributions, corrections were applied for sampling biases associated with spacing and trace length. The generated fracture system in 3-D was used to make predictions of fracture traces for each fracture set on 2-D win-dows. Developed stochastic 3-D fracture network for the rock mass was validated by comparing statistical proper-ties of the observed fracture traces on scanlines with the predicted fracture traces on the scanlines. This exercise fumed out to be successful.
Keywords
fracture network; stochastic modeling; rock slope; case study;
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