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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Prediction of seismic compression of saturated sand considering the ground motion characteristics and variable permeability
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Prediction of seismic compression of saturated sand considering the ground motion characteristics and variable permeability

机译：考虑地面运动特征和变渗透率的饱和砂土地震压缩预测

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摘要

A one dimensional shear beam numerical model was firstly established to calculate the seismic compression in free-field site of saturated sand by using OpenSees program. Based on the established model, the influence of permeability coefficient on the liquefaction-induced settlement of saturated sand was investigated by introducing a variable permeability coefficient model. The modified model was verified by comparison with results from centrifuge model test. The correlation between seismic compression and seismic load parameters was studied, and a velocity spectrum intensity (VSI) based prediction function was proposed to estimate the compression of saturated sand by considering both the characteristics of seismic motion and the sand properties. The results show that the modified variable permeability model significantly improves the accuracy of the simulation results. Direction of seismic motion has a significant effect on the seismic compression and excess pore water pressure of sand, and the simplification of using one-dimensional load in a certain direction to represent the two-dimensional loads underestimates the seismic compression of sands. The proposed VSI-based prediction function provides a means for estimating seismic compression of saturated sand, and the prediction accuracy improves with increasing the relative density of sand.
机译：首先利用OpenSees程序建立了一维剪切梁数值模型，以计算饱和砂自由场中的地震压缩。在建立的模型的基础上，通过引入可变的渗透系数模型，研究了渗透系数对液化诱发饱和砂沉降的影响。通过与离心模型测试的结果进行比较，验证了修改后的模型。研究了地震压缩与地震载荷参数之间的相关性，并提出了基于速度谱强度（VSI）的预测函数，通过考虑地震运动的特征和砂的性质来估计饱和砂的压缩。结果表明，改进的可变渗透率模型大大提高了模拟结果的准确性。地震运动的方向对砂土的地震压缩和过大的孔隙水压力有显着影响，而在一定方向上使用一维载荷来表示二维载荷的简化低估了砂土的地震压缩。所提出的基于VSI的预测函数为估算饱和砂土的地震压缩提供了一种方法，并且随着砂土相对密度的增加，预测精度也会提高。

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