【摘要】：對基于Copula函數(shù)的抗剪強度參數(shù)聯(lián)合分布模型和循環(huán)荷載對地基沉降系統(tǒng)失效概率的影響規(guī)律進行研究,并利用ABAQUS有限元模擬了循環(huán)荷載作用下地基沉降規(guī)律,對所提方法的有效性進行驗證。提出了循環(huán)荷載作用下的地基沉降系統(tǒng)失效概率模型,將該方法應(yīng)用到重慶市金佛山溢洪道工程實例中。結(jié)果表明:抗剪強度參數(shù)間相關(guān)性和循環(huán)荷載作用下的Copula函數(shù)類型對地基沉降有很重要的影響,不同Copula函數(shù)所計算得到的地基沉降系統(tǒng)失穩(wěn)概率有很大差別,這種差別隨溢洪道覆蓋層抗剪強度參數(shù)間負相關(guān)性的增大而增大、隨抗剪強度參數(shù)間變異系數(shù)的減小而增大、隨溢洪道水位線的增加而減小、與循環(huán)荷載的次數(shù)基本無關(guān)。建立有限元分析模型,對循環(huán)荷載作用下的地基沉降進行分析,得到了每次循環(huán)荷載作用下的地基沉降值和地基沉降差,沉降值和沉降差的變化隨著循環(huán)荷載次數(shù)的增加逐漸減小。計算結(jié)果表明,Copula函數(shù)的循環(huán)荷載作用下的地基沉降分析能夠很好地反映地基沉降變化和系統(tǒng)失效概率,可為地基沉降分析提供有效的參考。
[Abstract]:The combined distribution model of shear strength parameters based on Copula function and the influence of cyclic load on failure probability of foundation settlement system are studied. The foundation settlement law under cyclic load is simulated by ABAQUS finite element method. The validity of the proposed method is verified. The failure probability model of foundation settlement system under cyclic load is proposed and applied to the engineering example of Jinfushan spillway in Chongqing. The results show that the correlation between shear strength parameters and the type of Copula function under cyclic load has an important effect on foundation settlement, and the instability probability of foundation settlement system calculated by different Copula functions is very different. This difference increases with the increase of negative correlation between shear strength parameters of spillway overburden, increases with the decrease of coefficient of variation among shear strength parameters, and decreases with the increase of water level of spillway, which is basically independent of the number of cyclic loads. The finite element analysis model is established to analyze the foundation settlement under the cyclic load, and the settlement value and the difference of the foundation settlement under each cyclic load are obtained. The variation of settlement value and settlement difference gradually decreases with the increase of cyclic load times. The calculation results show that the analysis of foundation settlement under cyclic load of Copula function can well reflect the variation of foundation settlement and the failure probability of the system, and can provide an effective reference for the analysis of foundation settlement.
【作者單位】： 重慶交通大學(xué)國家內(nèi)河航道整治工程技術(shù)研究中心;重慶交通大學(xué)水利水運工程教育部重點實驗室;重慶交通大學(xué)重慶市高校水工建筑物診斷技術(shù)與設(shè)備工程研究中心;
【基金】：“十二五”國家科技支撐計劃資助項目(2015BAK09B01) 重慶市基礎(chǔ)與前沿研究計劃資助項目(重點)(cstc2015jcyjBX0139)
【分類號】：TV223

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