基于SPH方法的航道拓宽滑坡研究

Research on channel widening landslide based on SPH method

航道受船行波的冲刷或者在拓宽过程中会发生滑坡现象。基于DP屈服准则和理想弹塑性理论,推导了滑坡体的应力应变关系。在此基础上,利用SPH(光滑粒子流体动力学)方法,研究具有不同高长比的滑坡体的堆积形态。采用两个无量纲参数表征在高度和长度方向上的堆积形态,并和经验公式对比验证模型的准确性。在相同截面积条件下研究高长比对滑坡体外轮廓线的影响。研究结果表明:1)在该描述框架下的无量纲参数与文献中的计算值吻合较好;2)随着高长比的增大,坡体的屈服区逐渐变大,但滑坡体堆积的外轮廓线并没有太大的差异。

A landslide will occur when the channel is scoured by the ship s waves or in the process of widening.Based on the DP yield criterion and the ideal elastoplastic theory,the relation of the soil between strain and stress is derived.On this basis,the accumulation shape of landslide bodies with different cross-section ratios is studied by the SPH method.Two dimensionless parameters are used to describe the characteristics in the height and length directions,and the accuracy is tested by compared with experimental formal.The influence of height-length ratio on the contour of soil body is studied under the same cross-sectional area condition.The research results show that:1)The dimensionless parameters under the description framework used here are in good agreement with the computational values in the literature.2)With the increase of the height-length ratio,the yield zone of the slope will be larger,but there is not much difference in the outline of the landslide body.