一种基于Kriging代理模型的土壤压力沉陷特性预测方法  

Prediction Method of Soil Pressure Subsidence Characteristics Based on Kriging Surrogate Model

作　　者：冯文选 吴大林 马吉胜 何健 FENG Wenxuan;WU Dalin;MA Jisheng;HE Jian(Shijiazhuang Campus of Army Engineering University,Shijiazhuang 050003,Hebei,China;Xijing University,Xi’an 710123,Shaanxi,China)

机构地区：[1]陆军工程大学石家庄校区,河北石家庄050003 [2]西京学院,陕西西安710123

出　　处：《火炮发射与控制学报》2019年第4期57-61,共5页Journal of Gun Launch & Control

基　　金：军内重点科研项目(404040602)

摘　　要：基于有限元理论研究了加载速率和平板尺寸对土壤承压沉陷特性的影响,发现同一沉陷深度的土壤承载力随着加载速率的提高而增大,平板尺寸的增大会降低单位面积土壤承载力。采用Prony指数型函数拟合方法对不同土壤力学参数和加载条件下的土壤压力沉陷曲线进行数值拟合,拟合结果具有较高的精度,R 2均大于0.9.基于Kriging插值法建立土壤力学参数、加载速率和平板半径与Prony指数函数参数之间的代理模型,提出通过已知土壤力学参数和加载条件直接预测土壤承压沉陷特性的方法,模型测试效果良好。The effects of loading rate and plate size on the characteristics of soil pressure subsidence were studied based on the finite element theory.It was found that the soil bearing capacity with the same subsidence depth increased with the increase of loading rate,and that the bearing capacity of soil per unit area decreases with the increase of plate size.Prony exponential function fitting method was used to fit the soil pressure subsidence curve under different soil mechanics parameters and loading conditions.The fitting result had a higher accuracy,with R2 being greater than 0.9.The Kriging interpolation method was used to establish the surrogate model between the soil mechanics parameters,loading rate,plate radiusand the parameters of the Prony exponential function.A method for directly predicting the soil pressure subsidence characteristics through known soil mechanics parameters and loading conditions was proposed,with the model test results being good.

关 键 词：土壤 压力沉陷 有限元 拟合 PRONY法 KRIGING 

分 类 号：TJ81+0.1[兵器科学与技术—武器系统与运用工程]