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海上风电的桩基在长期循环荷载作用下会引起承载力的衰减。针对软黏土中水平受荷单桩,通过引入累积塑性应变以考虑土体不排水强度的循环弱化,建立二维有限元数值模拟和简化p-y曲线简化方法,以分析水平循环荷载作用后单桩桩侧侧向抗力的衰减弱化。在小数目循环荷载下简化方法与有限元计算结果比较吻合,在此基础上,采用二维简化分析方法得到长期大数目循环荷载下桩侧水平抗力的衰减规律,发现如荷载幅值与初始极限抗力的比值小于土体灵敏度的倒数,单桩在长期水平循环荷载作用下承载力虽有所衰减,但桩基趋于稳定,不会发生破坏。
Pile foundation of offshore wind power will cause the attenuation of bearing capacity under long-term cyclic loading. Aiming at the single horizontal pile subjected to horizontal load in soft clay, a two-dimensional finite element numerical simulation and simplified py curve simplification method are established by introducing cumulative plastic strain to account for cyclic weakening of undrained soil strength. After analyzing the effect of horizontal cyclic loading on single pile The attenuation of the lateral lateral resistance weakens. Under simple cyclic loading, the simplified method is in good agreement with the finite element method. Based on this, the attenuation law of horizontal resistance of piles under long-term large number of cyclic loadings is obtained by two-dimensional simplified analysis. It is found that if the load amplitude and initial limit The ratio of resistance is less than the reciprocal of soil sensitivity. Although the bearing capacity of single pile under the long-term horizontal cyclic loading decays, the pile foundation tends to be stable without damage.