흐름과 완전중복파와의 공존장하에서 해저지반내 동적응답의 해석해
An Analytical Solution of Dynamic Responses for Seabed under Flow and Standing Wave Coexisting Fields
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초록
일정수심상에서 완전중복파와 흐름이 공존하는 경우 얕은 두께를 포함하는 유한두께 및 무한두께의 해저지반내에서 동적응답을 나타내는 해석해를 유도한다. 이 때, Biot의 압밀이론에 기초하여 해저지반은 투과탄성매체로, 간극유체는 압축성으로, 그리고 지반내 간극수의 흐름은 Darcy법칙으로 각각 가정된다. 도출된 해석해는 기존의 해석결과와의 비교·검토로부터 검증되며, 실제 계산에서는 흐름속도, 입사파의 주기 및 지반두께 등의 변화에따른 지반변위, 간극수압, 유효응력 및 전단응력의 변동특성을 면밀히 검토한다. 이로부터 흐름이 존재하는 경우 흐름으로 인한 입사파와 반사파의 주기 및 파장의 변화로 인하여 흐름이 없는 경우의 지반응답과는 많은 차이를 나타낸다는 것을 확인할 수 있다.
Abstract
An analytical solution of dynamic responses for seabed in shallow, finite and infinite thicknesses has been developed under flow and standing wave coexisting field at a constant water depth condition. To do this, based on the Biot's consolidation theory, the seabed is assumed as a porous elastic media with the assumptions that pore fluid is compressible and Darcy law governs the flow. The developed analytical solution is compared with the previous results and is verified. Using the analytical solution the deformation, pore pressure, effective and shear stresses of seabed are examined under various given values of flow velocity, incident wave period and seabed thickness. From this study, it is confirmed that the seabed response is quite different depending on consideration of flow, which causes changing period and length of incident and reflection waves.
참고문헌 (20)
- Biot, M. A., "General theory of three-dimensional consolidation", J. Applied Physics, 12, pp.155~164 (1941)
- Chang, S. C., "An experimental study on non-linear progressive wave-induced dynamic stresses in seabed", Ocean Eng, 34, pp.2311~2329 (2007)
- Dean, R.G., "Water wave mechanics for engineers and scientists" (1984), World Scientific
- Hsu, J. R. C., "Short-crested wave induced soil response in a porous seabed of infinite thickness", Int. J. Numer. Analytical Methods Geomech., 17, pp.553~576 (1993)
- Jeng, D.S., "Wave-induced soil response in a nearly saturated sea-bed of finite thickness", Geotechnique, 46(3), pp.427~440 (1996)
- Jeng, D. S., "Response of porous seabed to dynamic loadings", Geotech. Eng. J. SEAGS & AGSSEA, 41(4) (2010)
- 이광호, "임의반사율의 부분중복파동장에서 유한두께를 갖는 해저지반 내지반응답의 해석법", 한국해안·해양공학회논문집, 26(5), pp.300~313 (2014), 한국해안,해양공학회[DOI]
- Liu, P. L. -F., "Long-wave induced flows in an unsaturated permeable seabed", J. Fluid Mech., 586, pp.323~345 (2007)
- Madsen, O. S., "Wave-induced pore pressure and effective stresses in a porous bed", Geotechnique, 28(4), pp.377~393 (1978)
- Maeno, Y.H., "In-situ measurements of wave-induced pore pressure for predicting properties of seabed deposits", Coastal Eng. in Japan, 30(1), pp.99~115 (1987)
- Okusa, S., "Measurements of wave-induced pore pressure in submarine sediments under various marine conditions", Mar. Geotechl., 6(2), pp.119~144 (1985)
- Park, Y. S., "Viscous flows in a muddy seabed induced by a solitary wave", J. Fluid Mech, 598, pp.383~392 (2008)
- Qi, W., "Local scour and porewater pressure around a monopile foundation under combined waves and currents", Proceedings of 22nd Intl. Offshore and Polar Eng. Conference, ISOPE, pp.159~165 (2012)
- Tsai, C. P., "Wave induced liquefaction potential in a porous seabed in front of a breakwater", Ocean Eng, 22, pp.1~18 (1995)
- Tsai, C.P., "Standing wave induced pore pressures in a porous seabed", Ocean Eng, 22(6), pp.505~517 (1994)
- Tsui, Y.T., "Wave induced pore pressures in submerged sand layer", J. Geotech. Eng. Div., ASCE, 109(4), pp.603~618 (1983)
- Verruit, A., "Elastic storage of aquifers, Flow through porous media" (1969), Academic Press
- Yamamoto, T., "On the response of a poro-elastic bed to water waves", J. Fluid Mech., 87(Part 1), pp.193~206 (1978)
- Zen, K., "Mechanism of wave-induced liquefaction and densification in seabed", Soil and Foundation, 30(4), pp.90~104 (1990)
- Zhang, Y., "An analytical solution for response of a porous seabed to combined wave and current loading", Ocean Eng, 57, pp.240~247 (2013)