A rigorous back analysis of shear strength parameters of landslide slip was presented. Kinematical element method was adopted to determine factor of safety and critical failure surface, which overcomes the disadvantag...A rigorous back analysis of shear strength parameters of landslide slip was presented. Kinematical element method was adopted to determine factor of safety and critical failure surface, which overcomes the disadvantage of limit equilibrium method. The theoretical relationship between the combination of shear strength parameters and stability state was studied. The results show that the location of critical slip surface, F/tan f and F/c depend only on the value of c/tan f. The failure surface moves towards the inside of slope as c/tan f increases. According to the information involving factor of safety and critical failure surface in a specific cross-section, strength parameters can be back calculated based on the above findings. Three examples were given for demonstrating the validity of the present method. The shear strength parameters obtained by back analysis are almost consistent with their correct solutions or test results.展开更多
基于塑性极限分析的运动单元法(kinematical element method)提出一种边坡稳定状况快速辨识方法。研究岩土体参数组合(坡高H、黏聚力c、内摩擦角和重度γ)与安全系数F和滑动面位置间的内在联系。在此基础上,绘制边坡稳定分析图,求解不...基于塑性极限分析的运动单元法(kinematical element method)提出一种边坡稳定状况快速辨识方法。研究岩土体参数组合(坡高H、黏聚力c、内摩擦角和重度γ)与安全系数F和滑动面位置间的内在联系。在此基础上,绘制边坡稳定分析图,求解不需要任何迭代,可快速求解安全系数和滑动面位置。根据边坡稳定分析图,提出一种新的参数反演方法。结果表明,无量纲参数c/(Htan)控制着滑动面位置和F/tan。λ不变,则滑动面位置和F/tan保持不变;λ越大,边坡失稳模式由浅层破坏变为深层破坏,滑动面坡顶滑出点离坡肩越来越远。当λ>0.2时,λ与F/tan符合线性关系,可用拟合公式快速计算安全系数。根据原始边坡形态和滑动面坡顶滑出点离坡肩的距离,即可快速反算滑带岩土体的黏聚力和内摩擦角。展开更多
Movable cellular automata (MCA) method is applied in the analysis of dynamic characters of ceramic armor composite structures under impact loading. As a new approach, MCA is different from the traditional numerical me...Movable cellular automata (MCA) method is applied in the analysis of dynamic characters of ceramic armor composite structures under impact loading. As a new approach, MCA is different from the traditional numerical methods such as the finite element method and boundary element method. Based on the theory of particle mechanics, MCA is applied as a powerful tool in solving specific structural analysis of materials loss and penetrating damages. In this paper the method is used to study responses of multi-layered ceramic plates as a base of armor structures under impact loading, thus assisting further investigations in the crashing process and to improve ceramic armor structures.展开更多
基金Project(51174228)supported by the National Natural Science Foundation of ChinaProject(CX2012B069)supported by Hunan Provincial Innovation Foundation for PostgraduateProject(201003)supported by Transportation Science and Technology Projects of Hunan Province,China
文摘A rigorous back analysis of shear strength parameters of landslide slip was presented. Kinematical element method was adopted to determine factor of safety and critical failure surface, which overcomes the disadvantage of limit equilibrium method. The theoretical relationship between the combination of shear strength parameters and stability state was studied. The results show that the location of critical slip surface, F/tan f and F/c depend only on the value of c/tan f. The failure surface moves towards the inside of slope as c/tan f increases. According to the information involving factor of safety and critical failure surface in a specific cross-section, strength parameters can be back calculated based on the above findings. Three examples were given for demonstrating the validity of the present method. The shear strength parameters obtained by back analysis are almost consistent with their correct solutions or test results.
文摘基于塑性极限分析的运动单元法(kinematical element method)提出一种边坡稳定状况快速辨识方法。研究岩土体参数组合(坡高H、黏聚力c、内摩擦角和重度γ)与安全系数F和滑动面位置间的内在联系。在此基础上,绘制边坡稳定分析图,求解不需要任何迭代,可快速求解安全系数和滑动面位置。根据边坡稳定分析图,提出一种新的参数反演方法。结果表明,无量纲参数c/(Htan)控制着滑动面位置和F/tan。λ不变,则滑动面位置和F/tan保持不变;λ越大,边坡失稳模式由浅层破坏变为深层破坏,滑动面坡顶滑出点离坡肩越来越远。当λ>0.2时,λ与F/tan符合线性关系,可用拟合公式快速计算安全系数。根据原始边坡形态和滑动面坡顶滑出点离坡肩的距离,即可快速反算滑带岩土体的黏聚力和内摩擦角。
文摘Movable cellular automata (MCA) method is applied in the analysis of dynamic characters of ceramic armor composite structures under impact loading. As a new approach, MCA is different from the traditional numerical methods such as the finite element method and boundary element method. Based on the theory of particle mechanics, MCA is applied as a powerful tool in solving specific structural analysis of materials loss and penetrating damages. In this paper the method is used to study responses of multi-layered ceramic plates as a base of armor structures under impact loading, thus assisting further investigations in the crashing process and to improve ceramic armor structures.
