At present,engineering construction is generally faced with unsaturated soil environment,and the prediction of shear strength of unsaturated soil is always a difficult and hot problem.Therefore,a method for predicting shear strength attenuation based on unsaturated seepage characteristics is proposed in this paper.Based on the water mass conservation equation,the control equation of unsaturated seepage flow is established,and the mathematical model of unsaturated seepage flow is constructed by defining the third kind of boundary conditions.Based on this,the finite element calculation model is obtained by using the spatial domain discrete and time-domain difference principles,and the discrete format between the finite element grids is calculated by combining the Chebyshev mesh method.The soil-water characteristic curve of soil is obtained by numerical simulation,and the relationship between it and the shear strength of soil is established,and the prediction formula for the shear strength decay of soil is obtained.The experimental results show that the root-mean-square error of the proposed method is only 1.26%,and the predicted results of shear strength are in good agreement with the actual results.The above experimental results show that the proposed method can accurately predict the attenuation of soil shear strength and has ideal application effect.
关键词
非饱和渗流/有限元模拟/抗剪强度/土-水特征曲线/衰减预测
Key words
unsaturated seepage/finite element simulation/shear strength/soil water characteristic curve/attenuation prediction
维普
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