Analysis on Physical and Mechanical Properties of Rock Mass in Korea

Seo, Yong-Seok; Yun, Hyun-Seok; Kim, Dong-Gyou; Kwon, O-Il

doi:10.9720/kseg.2016.4.593

Cited by 4 publications

(2 citation statements)

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“…e general ranges for the physical and mechanical properties of the soil and rock in the study area are well known because they have been extensively studied, with relatively similar values obtained among the different analyses. e physical and mechanical properties of the soil layer are based on the average of 392 data observations obtained from 39 construction projects in Korea, and the static properties of the rock, such as its unit weight, friction angle, and cohesion, are based on the average of 4,280 data observations obtained from 107 construction projects in Korea [29]. Furthermore, the dynamic properties of the rock, such as its dynamic elastic modulus and dynamic Poisson's ratio, are based on 2,210 data observations obtained from 60 construction projects in Korea.…”

Section: Physical and Mechanicalmentioning

confidence: 99%

Effects of Earthquake on Behavior Characteristics of Fault Gouge in Time-History Analysis of Slope

Moon

Kim

Seo

2022

Advances in Materials Science and Engineering

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A time-history analysis, based on the finite element method, was performed to identify the behavior of a slope containing fault gouge during earthquakes. Input seismic waves were obtained from earthquake data measured in Korea, with five earthquakes (M3.0, M3.9, M5.1, M5.4, and M5.8) to analyse the magnitude effects. The acceleration effects indicate approximately 50%–110% residual shear strain depending on the acceleration fluctuation within the coda wave section after the maximum acceleration was reached. This indicates that the permanent deformation due to the earthquake will remain because the ground is an elastic-plastic material. The magnitude effects also indicate that both the maximum shear stress and strain increase simultaneously as the magnitude increases and as the maximum acceleration tends to increase with increasing magnitude. However, both the cumulative and maximum accelerations should be considered when assessing slope stability since both the maximum shear stress and strain are affected by these two accelerations. Analysis of the presence or absence of fault gouge indicates that the shear strain could be concentrated on fault gouge, which is easily deformed or destroyed by shear strain.

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Section: Physical and Mechanicalmentioning

confidence: 99%

Effects of Earthquake on Behavior Characteristics of Fault Gouge in Time-History Analysis of Slope

Moon

Kim

Seo

2022

Advances in Materials Science and Engineering

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“…국내 아스팔트 도로포장에 는 침입도 등급이 60-70인 아스팔트가 주로 사용되며, 이를 이용해 만든 아스팔트 콘크리트의 탄성계수는 혼합된 골재 의 종류에 따라 약 0.5~0.7 GPa의 값을 가진다 (Ko et al, 2002;Setiawan et al, 2017). 이는 우리나라에 널리 분포한 화강 풍화암의 평균 탄성계수인 0.6 GPa과 유사한 값을 가진다 (Seo et al, 2016). 실험은 에폭시가 완전히 경화되는 10일 이후에 수행되었다.…”

Section: 암반지반 모사unclassified

Natural Frequencies of Model Piers under Different Ground Support Conditions

Kim¹,

Lee²,

Lee³

et al. 2021

J. Korean Soc. Hazard Mitig

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The natural frequency is critical for evaluating the integrity of bridge piers. However, the natural frequency of bridge piers can vary with the support condition of the ground. The aim of this study is to investigate the natural frequency of bridge piers under different ground conditions and at different embedded depths using a small-scale concrete pier. The model piers were fixed to asphalt concrete pavement using epoxy to simulate the rock site condition. Furthermore, model piers of different embedded depths were installed in a soil chamber with dimensions of 1.0 m × 1.0 m × 0.5 m to simulate weathered soil conditions. The upper part of the model pier was hit with a hammer having a rubber tip, and the acceleration signals were measured using three accelerometers installed at the upper, middle, and bottom parts of the model pier. Fast Fourier transforms were performed to analyze the natural frequencies of the model piers. The experimental results showed that the natural frequency under the fixed condition using epoxy was significantly higher than that under the unfixed condition. In the case of weathered soil conditions, three peak points appeared in the frequency domain. The natural frequencies measured at these three points increased with the embedded depth. The increment ratio of the natural frequency with the largest amplitude was significant. This study demonstrates that ground support conditions should be considered when evaluating the integrity of bridge piers through natural frequency analysis.

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Relationship between Chemical Weathering Indices and Shear Strength of Highly and Completely Weathered Granite in South Korea

et al. 2021

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In South Korea, weathered granite is widely distributed and has been used as a bearing stratum for various structures. Therefore, it is important to determine the shear strength of the weathered granite. However, it is difficult to obtain reliable shear strength parameters with laboratory tests or standard penetration test (SPT) because weathered granite is easily crushed during the sampling process, and the penetrability of SPT is not secured. On the other hand, it is well known that weathering affects the variation of geotechnical properties. Based on this concept, this study reports a correlation between the shear strength parameters and the chemical weathering indices of the weathered granite. In this study, the pressuremeter test (PMT) was adopted to determine the friction angle of the weathered granite. For the identical granite, the chemical weathering indices (Vogt’s Ratio (VR), Chemical Index of Alteration (CIA), and Mobiles Index (Imob)) were measured by X-ray fluorescence (XRF). An estimating model considering both site-specific characteristics and degree of weathering was used, and the CIA showed the best correlation (R2 = 0.66) with friction angle among the weathering indices. Since the ratio of measured friction angle over the predicted one was distributed in the range from 0.8 to 1.2, it is more reasonable to predict friction angles based on CIA comparing to using the SPT-N value. It can contribute to a better estimation of friction angles of weathered granite.

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Analysis on Physical and Mechanical Properties of Rock Mass in Korea

Cited by 4 publications

References 0 publications

Effects of Earthquake on Behavior Characteristics of Fault Gouge in Time-History Analysis of Slope

Effects of Earthquake on Behavior Characteristics of Fault Gouge in Time-History Analysis of Slope

Natural Frequencies of Model Piers under Different Ground Support Conditions

Relationship between Chemical Weathering Indices and Shear Strength of Highly and Completely Weathered Granite in South Korea

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