1、中文 2300 字 ， 1350 单词， 7400 英文字符 出处： Bretas E M, Lemos J V, Loureno P B. A DEM based tool for the safety analysis of masonry gravity damsJ. Engineering Structures, 2014, 59(2):248260. A DEM Based Tool for the Safety Analysis of Masonry Gravity Dams EM Bretas， JV Lemos， PB Loureno ABSTRCT A numerical m
2、odel for analysis of masonry gravity dams based on the Discrete Element Method is presented. The dam and the rock foundation are represented as block assemblies, using elementary 3- and 4-node blocks. Complex block shapes are obtained by assembling the elementary blocks into macro-blocks, allowing t
3、he model to be applied in various situations ranging from equivalent continuum to fully discontinuum analysis. A contact formulation was developed, which represents the interaction between macro-blocks in terms of contacts established between elementary blocks, based on an accurate edgeedge approach
4、. The main numerical aspects of the model are described, addressing in particular the contact creation and update procedures, and the numerical devices that support an efficient explicit solution algorithm. An application to the safety evaluation of an existing masonry dam is discussed, including st
5、ress analysis in the structure, and the assessment of sliding failure mechanisms, involving different paths in the vicinity of the damrock interface. 1 Introduction Structural analysis must use appropriate methods to achieve its final purposes. These methods should be capable of (i) modeling the geo
6、metrical and physical characteristics of the structure, in particular the discontinuities and joints, (ii) modelling the loads in an integrated manner, taking into account the interaction between the relevant phenomena involved, and (iii) evaluating the non-linear behaviour, particularly allowing the definition of failure mechanisms. Masonry gravity dams should be understood as a system composed of the dam itself, the reservoir, and the rock mass foundation. The dam and the rock mass are
