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김영수,서인식,김병탁,Kim, Yeong-Su,Seo, In-Sik,Kim, Byeong-Tak 한국지반공학회 1996 지반 : 한국지반공학회지 Vol.12 No.6
본 논문은 말뚝의 선단과 두부조건이 자유이며 수평하중을 받고 있는 수직말뚝의 모형실험에 대한 결과를 보여주고 있다. 모형실험은 원심모형실험기(동경공업대학 Markll)를 이용하여 현장응력상태하의 사질토지반에서 실시되었으며, 중력가속도, 휭강성, 그리고 지반의 상대밀도를 달리하여 실험을 실시하였다. 본 연구의 목적은 Toyoura모래에 근입된 말뚝의 거동에 대해 중력가속도, 횡강성, 그리고 상대밀도의 영향과 여러학자(Murchison & O'Neill, Reese et at., Scott, Det Norske Vertas, Kondner)들에 의해 제안된 p-y곡선의 적용성 검토에 있다. p-V곡선에 의해 프로그램이 만들어졌으며, 이 프로그램으로 말뚝의 수평변위와 모멘트 그리고 지반반력 분포를 예측할 수 있다. 실측된 거동과 예측된 거동의 비교에서, Murchison & O'Neill과 Kondnor에 의해 제안된 p-y곡선식의 결과가 다른 식들보다 실측결과와 일치하였다. This paper presents results from a series of model tests on laterally loaded single piles with both free-head and free-tip conditions. Model tests, using a centrifuge apparatus (middie size, Mark II in 7.1.7.) were carried out in sand based on the variation of different gravity acceleration and flexural stiffness of the pile and relative density of the soil. The aims of this study are to estimate the effect of gravity acceleratioil, flexordis stiffness, and relative density on the behavior of the pile embedded in Toyoura sand and to evaluate the applicability of a family of the p-y curves which was presented by several reseachers(Mur chison & O'Neill, neese et n., scott, Det worske veritas, nondner). The Program is deviloped by using p-y curves, and it can be used for the calculation of the displacement distri bution, bending moment distribution, and soil reaction distribution. By comparing meas ured responses with predicted one it is shown that the results of the p-y curve equation presented by Murchison & O'Neill and Kondner agreed with the general trend observed by the centrifuge tests much better than the numerical solutions predicted by the other sets of p -y curves.
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김영수,허노영,서인식,Kim, Yeong-Su,Heo, No-Yeong,Seo, In-Sik 한국지반공학회 1998 지반 : 한국지반공학회지 Vol.14 No.4
대구지역의 제반은 주로 쇄설성 퇴적암인 혈암으로 구성되어 있다. 이 혈암은 비균질, 비등방성 암석으로 각종 물성치와 역학적 특성이 층리면의 각도($\beta$값)에 따라 매우 다르다. 본 연구에서는 대구지역의 혈암에 대하여 각종 물성, 역학특성 시험을 실시하여 다음과 같은 결과를 얻었다. 비중값은 $\beta$값이 커질수록 감소하지만 간극률, 흡수율은 이와 반대로 증가 하였다. 탄성파 속도는 ($\beta$값이 $90^{\circ}$ 일때가 가장 끈 간을 보이고 탄성계수는$\beta$같이 $30^{\circ}$에서 최대치를 나타내었다. 그리고 강도혹성과 강도정수인 점착력과 마찰각은 모두 $\beta$값이 $60^{\circ}$에서 가장 작은 값을 나타내었다. The ground of Taegu area consists mainly of shales with elastic sedimentary rocks. These shales have a nonhomogeneous and anisotropic characteristics. So their physical and mechanical properties are very different due to the angles($\beta$ value) of bedding planes of sedimentary rock. In this study, the physical and mechanical characteristics of shales in Taegu area are studied by performing all kinds of rock test. According to results of test, apparent specific gravity of shale decreases as the $\beta$ value increases. On the contrary, porosity and absorption increase. Elastic wave velocity shorts the highest value at the $90^{\circ}$. And Young's modulus shows the maximum value at the $30^{\circ}$. The uniaxial strength, triaxial strength, cohesion and angle of friction show the minimum value at the $60^{\circ}$respectively.
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地震時 對數螺線曲線에 의한 斜面破壞의 確率論的 解析(Ⅱ)
金泳壽,徐寅軾,石宗洙 慶北大學校 1989 論文集 Vol.48 No.-
This study presents a probabilistic analysis of the stability of homogeneous soil slopes during earthquakes. The stability of the slope is measured through its probability of failure rather than the customary factor of safety. The maxium horizontal ground acceleration is determined with Donovan, McGuire equation. The earthquake magnitude m is a random variable. The probability density function f(m) has been obtained with a use of Richter's Law. The potential failure surfaces are taken to be of an exponential shape(log-spiral). Uncertainties of the shear strength parameters along potential failure surface are expressed by one-dimensional random field model. From a first order analysis the mean and variance of safety margin is calculated. The dependence on significant seismic parameters of the probability of failure of the slope is examined and the results are presented in a number of tables. On the base of the results obtained in this study, it is concluded that (1) the program that is developed by this study ie very useful in assessing the reliability of soil slopes under both static and seismic conditions; and (2) the provability of failure of a soil slope s greatly affected by the values of the seismic parameters that are associated with it.
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비틀림 진동 하중을 받는 말뚝 기초의 지반 강성에 관한 연구
김영수,김화중,서인식 경북대학교 산업기술연구소 1990 産業技術硏究誌 Vol.18 No.-
To investigate the effects of soil properties of the soft zone around a pile subjected to the torsional harmonic vibration, the parametric study is performed. The determination of the soil reaction or stiffness of the Winkler springs representing the soil around a pile is performed by dividing the soil profile into inner field and outer field. The conclusions obtained from this study are as follows : 1) In shear modulus, poisson ratios, density, damping ratio, and the distance to outer boundary, the real parts of the stiffness do not show variation but the imaginary parts show clear variation as the dimensionless frequency increases. 2) The real and imaginary parts of the stiffness increase as the shear modulus ratio and the density ratio increase. 3) The stiffnesses do not show variations to the ratio of poisson's ratio and the ratio of damping ratio.
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金泳壽,都德洙,徐寅軾 慶北大學校 1992 論文集 Vol.52 No.-
In this paper the stability of gravity retaining wall is analysed through its probability of failure during earthquakes. Mononobe and Okabe, Seed and Whitman, and Elms and Richards methods are used to determine dynamic earth pressures. And Meyerhof's ultimate bearing capacity theory is employed to find bearing capacity, Three possible modes of failure are examined using AFOSM method. To account for the uncertainty in their numerical values, these factors are taken tobe random variables instead of uniquely valued quantities. On the base of the results obtained in this study, it is concluded that (1) the program that is developed by this study is very useful in assessing the reliability walls under both static and seismic conditions : and (2) the probability of failure of a gravity retaining wall is greatly affected by horizontal accelleration.
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