加卸载响应比的数值模拟

NUMERICAL SIMULATION ON LOAD / UNLOADRESPONSE RATIO THEORY

用数值模型来模拟和验证加卸载响应比（ＬＵＲＲＬｏａｄ／Ｕｎｌｏａｄ ＲｅｓｐｏｎｓｅＲａｔｉｏ）理论．编制非均匀各向异性材料宏细观损伤破坏程序，模拟固体材料在损伤破坏时的加卸载过程，证实了加卸载响应比理论的正确性．结果表明，ＬＵＲＲ这一反映地球介质临近破坏的指标，也可以用来预测材料的破坏．同时讨论了一些参数（如均匀程度和脆性程序）对ＬＵＲＲ的影响，发现材料越呈脆性，或越均匀，ＬＵＲＲ值上升得越晚，曲线越陡．该结果对用ＬＵＲＲ指标预测地震具有一定启发．

The aim of this paper is to simulate and testify the Load/Unload Response Ratio(LURR theory by using numerical model. By using the program compiled byourselves to study the failure and damage process of inhomogeneous and edsotropicmaterial on meso-scopic and macroscopic scale, the small loading and unloadingprocesses of solid mareial during whole loading are modelled and cormctness ofLURR is verified. The results indicate that LURR value, the criterion to judge theunstable degree of earth media can also be used to predict the failure of material,meanwhile, influence of some parameters (such as homogeneous degree and brittleness)on LURR is discssed, that is, the more brittle or more homogeneous the malarial is,the later LURR values rise, the steeper the LURR curves appear. Such resultS areilluminating to earthquake prediction using LURR