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基于Biot固结模型,综合考虑围压、侧向排水条件及土体渗透率、孔隙率和剪切模量变异性等多方面因素的影响,对波致海床失稳问题进行了数学建模;基于总应力法建立了波致土体剪切破坏准则,该准则既适用于砂土,也适用于正常固结粘土。基于该准则,对东海大桥海上风电场海床稳定性进行了分析,讨论了平均波高、百年一遇的波高及破碎波高三种波况下,场地土体有效应力、振荡应力及应力角的变化情况,得到了波高变化对海床稳定性的影响趋势。本文的方法可为海上风电场的选址及基础设计提供参考。
Based on the Biot consolidation model, considering the effects of confining pressure, lateral drainage conditions and soil permeability, variability of porosity and shear modulus, the mathematic modeling of wave induced seabed instability Based on the total stress method, the shear failure criterion of wave-induced soil is established. The criterion is applicable to both sand and normal consolidated clay. Based on this criterion, the stability of the seabed of the Donghai Bridge offshore wind farm is analyzed, and the changes of effective stress, oscillation stress and stress angle of the site soil are discussed under the three conditions of average wave height, wave height at one hundred year and wave height at break. The trend of the influence of wave height on the stability of the sea floor is obtained. The method in this paper can provide reference for the site selection and foundation design of offshore wind farms.