Numerical analysis of interactive behavior between pile and seabed soil under wave load
HU Xiang1, CHEN Jing-jian1, 2
1. Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 2. State Key Laboratory of Ocean Engineering, Shanghai 200240, China
Abstract：An FEM model for a single pile embedded in a saturated seabed is proposed to study the interactive behavior between pile and seabed soil. Fluid-soil coupling and contact behavior on interface is considered, and the quasi-static method is adopted to simulate the crested short wave-induced load on seabed surface. Based on the numerical results, responses of pore water pressure and stress seabed soils under the wave load are investigated, and the deformation and internal force of the single pile are discussed. Two different methods to simulate the pile-soil interface are discussed with a comparison to the greenfield seabed model. The results show that the pore water pressure increases obviously near the bottom of pile, and the lateral displacement of pile is mainly affected by soil. Moreover, the pore water pressure and stress are overestimated by the pile-soil coupled model, and the stress concentration at bottom of pile is more obvious than that by the pile-soil contact model.
胡翔, 陈锦剑. 波浪荷载下海底单桩与土共同作用的数值分析[J]. 岩土工程学报, 2015, 37(zk2): 217-221.
HU Xiang, CHEN Jing-jian. Numerical analysis of interactive behavior between pile and seabed soil under wave load. Chinese J. Geot. Eng., 2015, 37(zk2): 217-221.
[1] BEA R G, WRIGHT S G. Wave-induced slides in south pass block 70, Mississippi Delta[J]. Journal of Geotechnical Engineering, 1983, 109(4): 619-644. [2] 赵 刚. 胜利作业三号平台“9.7”倾斜事故分析[J]. 现代职业安全, 2011(7): 100-102. (ZHAO Gang. Case study about ‘9.7’ inclination of the Shengli No.3 work platform[J]. Mordern Occupation Safety, 2011(7): 100-102. (in Chinese)) [3] 郑东生. 波浪和海床交互作用的多孔介质理论[M]. 上海:上海交通大学出版社, 2013. (JENG Dong-sheng. Porous Models for Wave-seabed Interactions[M]. Shanghai: Shanghai JiaoTong University Press, 2013. (in Chinese)) [4] YAMAMOTO. On the response of a pore-elastic bed to water waves[J]. Journal of Fluid Mechanics, 1978, 87(1): 193-206. [5] JENG D S, HSU J R C. Wave-induced soil response in a nearly saturated seabed of finite thickness[J]. Géotechnique, 1996, 46(3): 427-440. [6] JENG D S. Wave-induced seafloor dynamics[J]. Applied Mechanics Review, 2003, 56(4): 407-429. [7] LU J F, JENG D S. Poroelastic model for pile-soil interaction in a half-space porous medium due to seismic waves[J]. International Journal for Numerical and Analytical Methods in Geomechanics, 2008, 32(1): 1-41. [8] BHATTACHARYA S. Experimental validation of soil-structure interaction of offshore wind turbines[J]. Soil Dynamics and Earthquake Engineering, 2011, 31(5): 805-816 [9] LI X J, GAO F P,YANG B. Wave-induced pore pressure and soil liquefaction around pile foundation[J]. International Journal of Offshore and Polar Engineering, 2011, 21(3): 233-239. [10] YANG B, GAO F P. Experimental study on vortex-induced vibrations of submarine pipeline near seabed boundary in ocean currents[J]. China Ocean Engineering, 2006, 20(1): 113-121. [11] HSU J R C, JENG D S. Short-crested wave-induced soil response in a porous seabed of infinite thickness[J]. International Journal for Numerical and Analytical Methods in Geomechanics, 1993, 17(8): 553-576. [12] HSU J R C, JENG D S. Oscillatory soil response and liquefaction in an unsaturated layered seabed[J]. International Journal for Numerical and Analytical Methods in Geomechanics, 1995, 19(12): 825-849. [13] ZIENKIEWICZ O C. Drained, undrained, consolidating and dynamic behaviour assumptions in soils[J]. Géotechnique, 1980, 30(4): 385-395. [14] JENG D S, CHA D H. Effects of dynamic soil behavior and save non-linearity on the wave-induced pore pressure and effective stresses in porous seabed[J]. Ocean Engineering, 2003, 30: 2065-2089 [15] HSU J R C. Third-order approximation to short-crested waves[J]. Journal of Fluid Mechanics, 1979, 90(1): 179-196. [16] GATMIRI B. A simplified finite element analysis of wave-induced effective stress and pore pressures in permeable sea beds[J]. Géotechnique, 1990, 40(1): 15-30.
