發(fā)布時間：2018-05-04 09:35

  本文選題：海上風(fēng)電 + 吸力桶基礎(chǔ)��； 參考：《清華大學(xué)學(xué)報(自然科學(xué)版)》2017年11期

【摘要】：為進行海上風(fēng)電吸力桶基礎(chǔ)地震安全評估,選取歐洲北海砂質(zhì)海床中典型的吸力桶基礎(chǔ),基于三維砂土液化大變形統(tǒng)一本構(gòu)模型,通過OpenSees有限元開源平臺進行三維動力計算,分析了吸力桶基礎(chǔ)的地震變形和傾覆轉(zhuǎn)角。吸力桶基礎(chǔ)的地震變形具體如下:基礎(chǔ)產(chǎn)生一定的水平位移震蕩,最終累積發(fā)展為大變形;桶基發(fā)生嚴(yán)重的不均勻沉降,桶基后部出現(xiàn)一定程度的上移;傾覆轉(zhuǎn)角不斷增加,最終達0.8°以上,遠超過規(guī)范規(guī)定的安全穩(wěn)定運營值,后期無法運營;基礎(chǔ)轉(zhuǎn)動中心在地震過程中不斷調(diào)整;地震中海床孔壓上升,桶基內(nèi)出現(xiàn)一定的負孔壓,可以提高抗傾覆承載力,地震結(jié)束時負壓區(qū)消散。海床液化深度約3m,桶基前部產(chǎn)生刺入海床破壞。海床地震液化加劇了吸力桶基礎(chǔ)的變形和傾覆,嚴(yán)重影響著海上風(fēng)機的安全運營。
[Abstract]:In order to evaluate the seismic safety of the suction bucket foundation of offshore wind power, the typical suction bucket foundation in the sand seabed of the North Sea of Europe is selected. Based on the unified constitutive model of large deformation of three dimensional sand liquefaction, the 3D dynamic calculation is carried out by using the OpenSees finite element open source platform. The seismic deformation and overturning angle of suction bucket foundation are analyzed. The seismic deformation of the suction bucket foundation is as follows: the foundation produces a certain horizontal displacement oscillation, which eventually accumulates into a large deformation; the bucket foundation has serious uneven settlement, and the back part of the bucket foundation is moved up to a certain extent; the overturning angle is increasing. In the end, the operating value of safety and stability is far above 0.8 擄, which is far more than the safe and stable operating value specified in the code, and cannot be operated in the later period; the rotation center of the foundation is constantly adjusted during the earthquake; the pore pressure of the seabed increases during the earthquake, and a certain negative pore pressure appears in the bucket foundation. The overturning bearing capacity can be increased and the negative pressure area dissipates at the end of the earthquake. The liquefaction depth of the seabed is about 3 m, and the front part of the bucket foundation is impinging into the seabed. Seismic liquefaction of seabed intensifies the deformation and overturning of suction bucket foundation, which seriously affects the safe operation of offshore fan.
【作者單位】： 清華大學(xué)土木水利學(xué)院巖土工程研究所;清華大學(xué)水沙科學(xué)與水利水電工程國家重點實驗室;
【基金】：國家重點研發(fā)計劃項目(2016YFC1402806) 國家自然科學(xué)基金項目(50979046) 教育部研究項目(2014Z09100)
【分類號】：TU435

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