基于B样条的DLO(deformable linear Dbject)几何算法计算量小,但目前的研究尚未解决多个指定点和表面绘制问题。提出采用双段三次开放B样条分段描述DLO中心线,成功解决了多个指定点问题;提出通过坐标变换建立DLO线框模型,利用线框模型...基于B样条的DLO(deformable linear Dbject)几何算法计算量小,但目前的研究尚未解决多个指定点和表面绘制问题。提出采用双段三次开放B样条分段描述DLO中心线,成功解决了多个指定点问题;提出通过坐标变换建立DLO线框模型,利用线框模型顶点构建三角形面片,调用OpenGL函数库中的GL_POLYGON函数填充三角形面片,从而实现了DLO的表面绘制。实验和应用表明,上述算法的逼真度高,能够满足虚拟环境的真实感和实时性要求。展开更多
This paper investigates the validity and shortcomings of the existing analytical solution for the ultimate bearing capacity of a pile embedded in a rock mass using the modified HoekeBrown failure criterion.Although th...This paper investigates the validity and shortcomings of the existing analytical solution for the ultimate bearing capacity of a pile embedded in a rock mass using the modified HoekeBrown failure criterion.Although this criterion is considered a reference value for empirical and numerical calculations,some limitations of its basic simplifications have not been clarified yet.This research compares the analytical results obtained from the novel discontinuity layout optimization(DLO)method and the numerical solutions from the finite difference method(FDM).The limitations of the analytical solution are considered by comparing different DLO failure modes,thus allowing for the first time a critical evaluation of its scope and conditioning for implementation.Errors of up to 40%in the bearing capacity and unrealistic failure modes are the main issues in the analytical solution.The main aspects of the DLO method are also analyzed with an emphasis on the linearization of the rock failure criterion and the accuracy resulting from the discretization size.The analysis demonstrates DLO as a very efficient and accurate tool to address the pile tip bearing capacity,presenting considerable advantages over other methods.展开更多
文摘基于B样条的DLO(deformable linear Dbject)几何算法计算量小,但目前的研究尚未解决多个指定点和表面绘制问题。提出采用双段三次开放B样条分段描述DLO中心线,成功解决了多个指定点问题;提出通过坐标变换建立DLO线框模型,利用线框模型顶点构建三角形面片,调用OpenGL函数库中的GL_POLYGON函数填充三角形面片,从而实现了DLO的表面绘制。实验和应用表明,上述算法的逼真度高,能够满足虚拟环境的真实感和实时性要求。
文摘This paper investigates the validity and shortcomings of the existing analytical solution for the ultimate bearing capacity of a pile embedded in a rock mass using the modified HoekeBrown failure criterion.Although this criterion is considered a reference value for empirical and numerical calculations,some limitations of its basic simplifications have not been clarified yet.This research compares the analytical results obtained from the novel discontinuity layout optimization(DLO)method and the numerical solutions from the finite difference method(FDM).The limitations of the analytical solution are considered by comparing different DLO failure modes,thus allowing for the first time a critical evaluation of its scope and conditioning for implementation.Errors of up to 40%in the bearing capacity and unrealistic failure modes are the main issues in the analytical solution.The main aspects of the DLO method are also analyzed with an emphasis on the linearization of the rock failure criterion and the accuracy resulting from the discretization size.The analysis demonstrates DLO as a very efficient and accurate tool to address the pile tip bearing capacity,presenting considerable advantages over other methods.
