【摘要】：飽和砂土液化是巖土地震工程和土動力學(xué)研究領(lǐng)域的重要課題。在動力液化數(shù)值計算中,計算精度和計算效率一直是衡量數(shù)值方法的重要指標。在水土二相耦合彈塑性計算的數(shù)值平臺上開發(fā)了自適應(yīng)步長方法,通過位移誤差、孔壓誤差和混合誤差的評估體系建立了時間步長自動調(diào)整的策略及相關(guān)控制參數(shù)。通過控制參數(shù)的影響性分析,確定了主要控制參數(shù)為誤差允許值和孔壓誤差比例系數(shù),輔助控制參數(shù)為初始時間步長、步長調(diào)整的下限和上限。對處于液化場地的地鐵車站模型進行了動力自適應(yīng)步長數(shù)值計算,獲得了上浮位移和超孔壓比的發(fā)展過程,預(yù)測出液化上浮的災(zāi)害。同時也對比了固定步長法和自適應(yīng)步長法的精度和效率,發(fā)現(xiàn)采用自適應(yīng)步長法可極大的節(jié)約計算成本并不失計算精度。
[Abstract]:Saturated sand liquefaction is an important subject in the field of geotechnical seismic engineering and soil dynamics. In the numerical calculation of dynamic liquefaction, the calculation accuracy and efficiency are always the important indexes to measure the numerical method. The adaptive step method is developed on the numerical platform of soil and water two-phase coupling elastoplastic calculation. The automatic adjustment strategy of time step and related control parameters are established through the evaluation system of displacement error, pore pressure error and mixed error. Through the influence analysis of the control parameters, the main control parameters are error allowable value and pore pressure error proportional coefficient, and the auxiliary control parameters are the initial time step, the lower limit and the upper limit of step size adjustment. The dynamic adaptive step numerical calculation of subway station model in liquefaction site is carried out, and the development process of floating displacement and super-pore pressure ratio is obtained, and the disaster of liquefaction floating is predicted. At the same time, the accuracy and efficiency of the fixed step size method and the adaptive step size method are compared. It is found that the adaptive step size method can greatly save the calculation cost and not lose the calculation accuracy.
【作者單位】： 濟南大學(xué)土木建筑學(xué)院;大連理工大學(xué)海岸與近海工程國家重點實驗室;
【基金】：國家自然科學(xué)基金項目(41402261)
【分類號】：TU435

【參考文獻】

相關(guān)期刊論文 前10條

1 張西文;唐小微;n&\×冀，

本文編號：2171063