An inverse analysis procedure has been developed to interpret collected pore pressure data and observations during backward erosion piping(BEP)initiation and progression in sandy soils.The procedure has been applied t...An inverse analysis procedure has been developed to interpret collected pore pressure data and observations during backward erosion piping(BEP)initiation and progression in sandy soils.The procedure has been applied to laboratory models designed to mimic the initiation and progression of BEP through a constricted vertical outlet.The inverse analysis uses three-dimensional(3D)finite element method(FEM)to successively produce models of the hydraulic head regime surrounding progressive stages of BEP based on observations at the sample surface and pore pressure measurements obtained from the laboratory models.The inverse analysis results in a series of 3D contour plots that represent the hydraulic-head regime at each stage of the BEP development,allowing for assessing the development of BEP mechanism as well as calculating the critical hydraulic conditions required for various BEP stages to initiate and progress.Interpretation of the results identified four significant stages of the piping process:(1)loosened zone initiation,(2)channel initiation and progression,(3)riser sand fluidization,and(4)loosened zone progression.Interpretation of the hydraulic head contour plots allows assessment of the critical hydraulic gradients needed to initiate and progress various components of the BEP development.展开更多
光学相干层析技术是一种高分辨率成像方法。它是一种无损伤、非介入、非离子辐射的探测技术,具有较高的空间分辨率。有限元分析(FEA)是用于工程科学的重要工具,FEMLAB(Finite Element Modeling Laboratory)是基于偏微分方程的对科学和...光学相干层析技术是一种高分辨率成像方法。它是一种无损伤、非介入、非离子辐射的探测技术,具有较高的空间分辨率。有限元分析(FEA)是用于工程科学的重要工具,FEMLAB(Finite Element Modeling Laboratory)是基于偏微分方程的对科学和工程问题进行建模和仿真计算的交互式系统。本文简要介绍了OCT成像技术的原理及FEMLAB的应用步骤,重点用FEMLAB软件对脑组织内光场的分布情况进行分析,从而利用分析结果论证OCT成像在脑外科手术中应用的可行性。展开更多
基金support from the South China University of Technology for the PhD short-term visiting project。
文摘An inverse analysis procedure has been developed to interpret collected pore pressure data and observations during backward erosion piping(BEP)initiation and progression in sandy soils.The procedure has been applied to laboratory models designed to mimic the initiation and progression of BEP through a constricted vertical outlet.The inverse analysis uses three-dimensional(3D)finite element method(FEM)to successively produce models of the hydraulic head regime surrounding progressive stages of BEP based on observations at the sample surface and pore pressure measurements obtained from the laboratory models.The inverse analysis results in a series of 3D contour plots that represent the hydraulic-head regime at each stage of the BEP development,allowing for assessing the development of BEP mechanism as well as calculating the critical hydraulic conditions required for various BEP stages to initiate and progress.Interpretation of the results identified four significant stages of the piping process:(1)loosened zone initiation,(2)channel initiation and progression,(3)riser sand fluidization,and(4)loosened zone progression.Interpretation of the hydraulic head contour plots allows assessment of the critical hydraulic gradients needed to initiate and progress various components of the BEP development.
文摘光学相干层析技术是一种高分辨率成像方法。它是一种无损伤、非介入、非离子辐射的探测技术,具有较高的空间分辨率。有限元分析(FEA)是用于工程科学的重要工具,FEMLAB(Finite Element Modeling Laboratory)是基于偏微分方程的对科学和工程问题进行建模和仿真计算的交互式系统。本文简要介绍了OCT成像技术的原理及FEMLAB的应用步骤,重点用FEMLAB软件对脑组织内光场的分布情况进行分析,从而利用分析结果论证OCT成像在脑外科手术中应用的可行性。
