[논문]해성 점성토의 동적 강도 및 변형 특성

김용성; 서민우; 오상은

doi:10.5389/ksae.2012.54.3.159

[국내논문] 해성 점성토의 동적 강도 및 변형 특성
Cyclic Strength and Deformation Characteristics of Marine Cohesive Soil 원문보기

한국농공학회논문집 = Journal of the Korean Society of Agricultural Engineers, v.54 no.3, 2012년, pp.159 - 168

김용성 (강원대학교 농업생명과학대학 지역건설공학과) , 서민우 ((주)삼성물산 건설부문) , 오상은 (강원대학교 농업생명과학대학 바이오자원환경학과)

초록
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본 연구에서는 해성 점성토에 대하여 반복 삼축시험을 실시하고 응력-변형률 관계 및 유효응력경로 특성 분석을 통해 동적 변형 및 강도 특성을 조사하였다. 시험에 사용된 시료는 일본 도쿠시마현의 코마츠시마 항 인근에서 채취된 점성토이며, 반복 삼축시험으로 동적 비배수 삼축시험, 동적 비배수 삼축시험 후 동적 삼축변형시험, 다단계 동적 비배수 삼축시험, 동적 삼축 변형시험 등 4종류의 시험을 수행하고, 시험 주파수로서 0.1 및 0.01 Hz을 적용하였다. 본 연구 결과 0.01 Hz로 수행된 동적 삼축시험 결과는 0.1 Hz로 수행된 삼축시험 결과보다 평균유효응력의 감소량이 크며, 반복 하중은 해성 점성토의 구조적 약화를 초래하고 초기 거동시 발생하는 간극수압과 밀접하게 관련이 있는 것으로 나타났다. 또한 미소변형률 영역에서 등가 탄성계수는 시험 횟수가 증가함에 따라 점차 감소하며, 감쇠비는 점차 증가하는 것으로 보아 변형계수는 반복 하중으로 인한 전단변형률의 축척에 따른 변형률 의존 거동에 관련하는 것으로 판단된다.

주제어

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제안 방법

The multi-stage cyclic undrained triaxial tests of Case C were performed to investigate the characteristics of stress-strain and pore pressure ratio under cyclic loads after the pore pressure generated by the initial cyclic undrained triaxial test was dissipated. Additionally, the Case D test was conducted to examine the effects of the equivalent elastic modulus and damping ratio in small strain range under cyclic loads after the pore pressure generated by the initial cyclic undrained triaxial test was dissipated. The results of the Case C and D tests may be used in investigatiing the ground characteristics under repeated dynamic loads such as the case when earthquake occurrs again in some time after the first earthquake.
In this study, cyclic triaxial tests were performed on marine clays and the dynamic strength characteristics were investigated by examining the stress-strain relationships and the effective stress paths. The followings are the conclusions drawn from this study.
In this study, the test was done first in the number of 18 cycles and after the pore pressure dissipated, it was began again and completed in the number of 120 cycles. For pore pressure ratio, the values of 0.
In this study, various deformation and strength characteristics of marine clay have been examined in the context of cyclic undrained triaxial tests and cyclic triaxial tests to determine deformation properties. It is expected that the results from this study may be used as basic data for seismic preparedness in coastal or shore region.
The Case C tests were performed to investigate the characteristics of stress-strain and pore pressure ratio under cyclic loads after the pore pressure generated by the initial cyclic undrained triaxial test was dissipated. The Case C was multi stage, namely first stage and second stage, cyclic undrained triaxial tests with the same specimen and S-5a was tested in this method with 0.
This test method covers the determination of the deformation properties of geomaterials in either an isotropic or an anisotropic stress state, when subjected to either drained or undrained cyclic loading in triaxial apparatus.
This test method covers the determination of the relationships between the single amplitude of cyclic deviator stress and the cyclic stress ratio, which is applied under undrained condition with cyclic triaxial apparatus, and the number of cycles required to cause a specified value of double amplitude of axial strain or to cause a specified value of excess pore water pressure ratio.

성능/효과

1. After the cyclic undrained triaxial test of marine clay, it is found that the amount of decrease of mean effective stress in the case of 0.01 Hz is larger than that of 0.1 Hz.
2. Dissipation of the positive pore pressure generated during previous cyclic loading stage caused a lower void ratio at the beginning of each cyclic stage and pore water pressure at next cyclic loading stage decreased due to the lower void ratio in multi stage cyclic loading test of marine clay.
3. The deformation coefficient relates to the strain dependence behavior owing to the accumulation of shear strains by cyclic loading in cyclic triaxial deformation test of marine clay.

후속연구

In this study, various deformation and strength characteristics of marine clay have been examined in the context of cyclic undrained triaxial tests and cyclic triaxial tests to determine deformation properties. It is expected that the results from this study may be used as basic data for seismic preparedness in coastal or shore region.
, 2010), and so on. Nonetheless, the dynamic behavior of clay has not been clearly identified and further research is still needed.

참고문헌 (11)

Ackerley, S. K., J. E. Hellings and R. J. Jardine, 1987. Discussion on: A new device for measuring local axial strains on triaxial specimens. Geotechnique 37: 414-415.
Burland, J. B. and M. Symes, 1982. A sinple triaxial displacement gauge for use in the triaxial apparatus. Geotechnique 32: 62-65.

상세보기
Clayton, C. R. I., and S. A. Khatrush, 1986. A new device for measuring local axial strains on triaxial specimens. Geotechnique 36: 593-597.

상세보기
Hyodo M., M. Sugiyama, Y. Yamamoto and Y. Kawata, 1994. Evaluation of pore pressure and strain of normally consolidated and overconsolidated clay subjected to cyclic shear stress. Journal of the JSCE 487(3): 79-88 (in Japanese).
Ishigaki, S., K. S. Yeon and Y. S. Kim, 2010. Loading frequency dependencies of cyclic shear strength and elastic shear modulus of reconstituted clay. Journal of the Korean Society of Agricultural Engineering 52(3): 73-79 (in Korean).
Jardine, R. J., N. J. Symes and J. B. Burland, 1984. The measurements of soil stiffness in th triaxial apparatus. Geotechnique 34: 323-340.

상세보기
Kim, Y. S., 2006. Frequency dependence in large strain range during cyclic triaxial tests of clay. Journal of the Korean Society of Agricultural Engineering 48(5): 63-71 (in Korean).
Lee, S. L. and J. Y. Kim, 1994. Constitutive equation for clay in overconsolidation state and under cyclic loading. Journal of the Korean Geotechnical Society 10(1): 7-17 (in Korean).
Li, L. L., H. B. Dan and L. Z. Wamg, 2011. Undrained behavior of natural clay under cyclic loading. Ocean Engineering 38: 1792-1805.

상세보기
Woods, R. D., 1978. Measurement of dynamic soil properties, Proc. Geotech. Engng. Div. Specialty Conf. on Earthquake Engineering and Soil Dynamics, ASCE, Pasadena, 1: 91-178.
Yildirim, H. and H. Ersan, 2007. Settlement under consecutive series of cyclic loading. Soil Dynamics and Earthquake Engineering 27: 577-585.

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