Estimation of in situ geotechnical properties on highly weathered granite using chemical weathering indices
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ORIGINAL PAPER
Estimation of in situ geotechnical properties on highly weathered granite using chemical weathering indices Seung-Hwan Lee 1 & Sung-Ha Baek 2 & Sang Inn Woo 3 & Choong-Ki Chung 1 Received: 24 May 2019 / Accepted: 7 March 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Highly weathered granites exist in thick subsurface layers in most regions of South Korea and are often used as a bearing stratum of geotechnical structures. However, because of the difficulty of retrieving samples for laboratory tests and the cost and time constraints of in situ testing, researchers mostly estimate the geotechnical properties of highly weathered granite using the standard penetration test (SPT)-N values or directly adopt the literature values. In this study, in situ testing was performed to evaluate the geotechnical properties of highly weathered granite in South Korea, and the chemical weathering indices were calculated using the retrieved samples. Particular attention was given to the development of a geotechnical properties estimation method that could consider the degree of weathering and site-specific characteristics using both in situ test results and chemical weathering indices. Correlation analysis was performed between the geotechnical properties of the highly weathered granite predicted by the proposed method and the measured geotechnical properties. The results show that the pressuremeter modulus values (Em and Eur) that were estimated using the modified weathering potential index (MWPI) showed a strong correlation (R2 > 0.7) with the measured values. Keywords Highly weathered granite . Geotechnical properties . Chemical weathering indices . In situ test
List of notations Em is the pressuremeter modulus Eur is the unload-reload modulus VP is the P-wave velocity VS is the S-wave velocity Edy is the dynamic Young’s modulus Gmax is the maximum shear modulus γt is the unit weight calculated using the bulk density and gravitational acceleration ξ is the geotechnical properties ξMW is the geotechnical properties of moderately weathered granite ξHW is the geotechnical properties of highly weathered granite
ξRS WI WIMW
* Choong-Ki Chung [email protected]
1
Department of Civil and Environmental Engineering, Institute of Construction and Environmental Engineering, Seoul National University, Seoul, South Korea
2
Department of Future Technology and Convergence Research, Korea Institute of Civil Engineering and Building Technology, Goyang, South Korea
3
Department of Civil and Environmental Engineering, Hannam University, Daejeon, Daedeok-gu, South Korea
Seung-Hwan Lee [email protected] Sung-Ha Baek [email protected] Sang Inn Woo [email protected]
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