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조후연,설훈일,정상섬 한국지반공학회 2009 한국지반공학회논문집 Vol.25 No.8
The load distribution and deformation of rock socketed drilled shafts subjected to axial loads were evaluated by a load transfer approach. The emphasis was laid on quantifying the end bearing load transfer characteristics of rock socketed drilled shafts based on 3D Finite Difference (FD) analysis performed under varying rock strength and rock mass conditions. From the results of FD analysis, it was found that the ultimate unit toe resistance (qmax) was influenced by both rock strength and rock mass conditions, while the initial tangent of end bearing load transfer curve (Gini) was only dependent on rock strength. End bearing load transfer function of drilled shafts socketed in rock was proposed based on the FD analysis and the field loading tests which were performed on weathered rock in South Korea. Through the comparison with the results of the field loading tests, it is found that the load transfer curve by the present study is in good agreement with the general trend observed by field loading tests, and thus represents a significant improvement in the prediction of load transfer behavior of drilled shaft.
유한차분해석과 개별요소해석을 이용한 암반에 근입된 현장타설말뚝의 선단지지력 연구
이재환,조후연,정상섬,유광호 한국지반공학회 2012 한국지반공학회논문집 Vol.28 No.1
The maximum unit point resistance (qmax) of rock socketed drilled shafts subjected to axial loads was investigated by a numerical analysis. A 3D Finite Difference Method (FDM) analysis and a Distinct Element Method (DEM) analysis were performed with varying rock elastic modulus (E), discontinuity spacing (Sj), discontinuity dip angle (ij), and pile diameter (D). Based on the results of obtained, it was found that the ultimate point resistance (qmax) increased as rock elastic modulus (E) and rock discontinuity spacing (Sj) increased. But, it was found that qmax decreased as pile diameter (D) increased. As for the influence of the dip angle of rock discontinuity (ij), it was shown that qmax decreased up to 50% of maximum value within the range of 0°<ij<60° due to the shear failure at rock discontinuities. Furthermore, it was found that if 20°≤ij≤40°, influence of ij should be taken into account because qmax tended to approach a minimum value as ij approached a value near the friction angle of the discontinuity ().
김수일,정상섬,조후연,Kim, Soo Il,Jeong, Sang Seom,Cho, Hoo Youn 대한토목학회 1994 대한토목학회논문집 Vol.14 No.3
본 논문에서는 이미 제안된 발파진동식 중에서 국내의 지질조건에 가장 적합한 식을 연구하였다. 국내에서 측정된 여러 현장의 자료를 이용하여 제안된 발파진동식의 적합성을 분석 검토하였다. 실측자료를 이용한 발파진동식의 산정은 선형회귀분석을 적용하였다. 또한 실측자료로 각 발파진동식을 산출한 후에는 이 발파진동식에 다시 환산거리를 대입하여 진동속도를 산출하였다. 산출한 진동속도와 측정한 진동속도를 비교함으로써 회귀분석한 발파진동식의 신뢰성을 도심지의 소규모발파와 채석장의 대규모발파를 나누어서 살펴보았다. 그 결과 국내의 지질조건에 가장 적합한 식은 미광무국에서 제안한 ROOT SCALE과 CUBE ROOT SCALE 임을 밝혔다. 또한 본 논문에서는 실측자료와 기존의 현장자료를 이용하여 각 암종을 대표할 수 있는 발파진동식을 제안하였다. Blast vibration equations proposed previously are investigated. Special attention is given to the blast vibration equation which shows the best fitting to the geologic condition of Korea. The fittness of proposed blast vibration equation is analyzed and examined using many field data measured in Korea. The prediction of blast vibration equation using field data was performed by linear regression analysis. Moreover, after the prediction of each blast vibration equation, vibration velocity is recalculated on the basis of scaled distance at each equation. Reliability of regressioned blast vibration equation is observed by comparing predicted and measured velocity, which is divided into small-scale blasting of city and large-scale blasting of quarry. Based on this study, the best fitting equation to the Korean geologic condition is ROOT SCALING & CUBE ROOT SCALING proposed by USBM(United Nations Bureau of Mines). Also representative blast vibration equations depending on the different kinds of rock mass are proposed using measured and existing field data.