The dynamic response analysis of the underwater site is the basis of aseismic design of underwater structures.However, since the dynamic problem of underwater site is a multi-media coupling and complex problem, the existing research results mostly regard saturated soil as an elastic single-phase material.There are few studies on the nonlinearity of saturated soil.Based on the linear solution of the water-stratified saturated soil-bedrock site, a two-dimensional equivalent linearization method under oblique incidence of seismic waves was established.A typical site analysis was explored to study the effects of the peak acceleration of incident wave, water depth and overlying soft soil thickness on the peak acceleration amplification coefficient at the interface of water and soil.The results show that compared with the vertical peak acceleration amplification factor, the nonlinearity has a greater effect on the horizontal result, and the nonlinear amplification factor may be greater than the linear result.The water layer has a greater effect on the horizontal peak acceleration amplification coefficient in the range of 15°—70° and 45°—70° incident angles of P wave and SV wave respectively, and P wave has a more obvious effect on the vertical peak acceleration amplification coefficient than SV wave.When the overlying soft soil layer is thick, it has a greater effect on the horizontal peak acceleration amplification coefficient in the range of 35°—70° P wave incidence angle, and SV wave has a greater effect on the horizontal peak acceleration amplification coefficient than P wave, however, either of P wave and SV wave has little effect on the vertical peak acceleration amplification coefficient.
张奎，李伟华，赵成刚. 地震波斜入射下水下地基场地的等效线性化分析方法及应用[J]. 振动与冲击, 2020, 39(22): 41-49.
ZHANG Kui，LI Weihua，ZHAO Chenggang. Application of equivalent linear method in underwater site analysis under oblique incidence of seismic waves. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(22): 41-49.
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