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김팔규,송전섭 忠南大學校 産業技術硏究所 1988 산업기술연구논문집 Vol.3 No.1
The objective of this paper is to study the stress-strain characteristics of clays which are subjected to repeated loading. For this study the undrained triaxial test is performed by using compression failure, cycled-at failure, ultimate failure, and non-failure equilibrium test. These four test were run at both 0.03㎜/min. of strain rate and also at 0.3㎜/min. of strain rate. The characteristics of the clay is compared through the two kinds of stress-strain rates.
金八圭,宋典燮 忠南大學校 産業技術硏究所 1986 산업기술연구논문집 Vol.1 No.1
The construction control of the structures has been recently recognized the very important matter. An embankment on a soft clayes is usually unstably constructed compared with other structures, because the design under construction is comparatively changed easily in the earth works. This causes it important especially in the embankment construction to control safely and quickly by using the information obtained from the practically possible measurements. This paper describes the study on the method in which the degree of safety at the present situation is ascertained and successive failure is predicted by observing the vertical settlements at the central spot just under the embankment and horizontal displacement near the toe of the slope.
變形速度變化에 따른 花崗土의 剪斷强度 : 3軸壓縮試驗에 의해
金八圭,宋容善,宋典燮 忠南大學校 産業技術硏究所 1986 산업기술연구논문집 Vol.1 No.2
The effect of the rate of strain on the shear strength has been studied mainly in clay and sands. This paper is designed to establish the effect of the rate of strain by the triaxial compression test on weathered granite soil samples which vary in moisture content. The major results obtained from this study were: 1) Increasing strain rate increases angle of shear resistance but the cohesion decreases, 2) The variation of strength parameter is smaller under the 1.0-1.25mm/min rate of strain than any other strain rate, 3) The shear strength of weathered granite soil increases as strain rate increases.
최영송,송전섭,김팔규 忠南大學校 産業技術硏究所 1990 산업기술연구논문집 Vol.5 No.2
Pile driving is a complex problem to be solved, involving the interaction of the hammer, soil and pile. Recently the wave equation analysis as proposed by Smith has been most frequently used to investigate pile driving caracteristics. The purpose of this work, therefore, is to discuss the case of the wave equation as applied to deep alluvial deposit soil with the help of complete driving and loading test results executed during the construction of the Nakdong Estuary Barrage located at the river mouth of the Nakdong. Comprehensive literature review of the proposed value to inqut parameters have been made to find and propose optimum parameters applicable to this area. For various different value of parameters, of course, within the boundary of valkue found from literature, pile set and total resistance were predicted by using the WEAP.
반복하중을 받는 등방정친압밀점토의 거동 및 한계반복응력
김팔규,송전섭 한국지반공학회 1988 대한토질공학회지 Vol.4 No.3
반복하중을 받는 정토의 거동은 단일하중에 의한 결과와 매우 상리하게 나타나며, 그중에서도 특히 간극수려의 거동은 상당히 중요하다. 본 연구는 반복하중 하에서의 점토에 대한 응력-변형 특성을 규명하기 위한 실험적 연구로서 하 중을 가하는 동안에 발생하는 간극수려에 대하여도 언급하였다. 시료는 삼축용기 안에서 24시간동안 등방려밀시켰으며, 삼축시험은 비배수상태 하에서 재성형된 시료에 때하여 압축파괴, 파괴반복, 비파괴 평형시험을 변형제어방법으로 수행하였다. 이에 따라 어느 특정한 시료의 거동을 뚜렷하게 서로 다른 두가지 양상으로 구분하는 반복응력의 한계치가 존재 함을 확인할 수 있었다. The behavior of clays subjected to Repeated loading has been shown to be very different from the behavior under a single load application. Especially the behavior of pore water pressure is Qf considerable importance. The objective of this work is to experimentally study the stress-strain characteristics of clays, and this study includes the pore water pressure which is built up during the load repetition. For this study, the samples were consolidated isotropically in the triaxial cell during 24 hours, .and monotonic strain controlled triaxial test is carried out by uslng the tests of Compression failure, Cycled at failure, and Nonfailure equilibrium on remoulded samples under undrained .condition . Consequently there exists a critical level of repeated loading which seperates the behavior of a particular sample into two distinctly different patterns.
김팔규,김경진,송전섭,김명우 충남대학교 공업교육연구소 1989 論文集 Vol.12 No.1
The objective of this paper is to study experimentally anisotropically consolidated clay which are subjected to repeated loading, and to include in this experimentally study the measurement of pore water pressures, stress - strain, pore water pressure - strain and equilibrium line. For this study the undrained triaxial test is performed by using compression failure, cycled at failure, 2-WAY, non-failure equilibrium test.