重力坝断裂数值分析研究  

Numerical analysis of fracture in gravity dam

作　　者：杜效鹄[1] 段云岭[1] 王光纶[1] 

机构地区：[1]清华大学水利水电工程系,北京100084

出　　处：《水利学报》2005年第9期1035-1042,共8页Journal of Hydraulic Engineering

摘　　要：本文研究了预制缝重力坝模型的断裂特性。通过对模型的断裂过程分析表明,在有限元富集技术中引入粘结裂纹模型能够较好地反映模型的承载特性和破坏过程,可以得出与试验结果相一致的荷载响应曲线和裂纹扩展路径。数值方法指出模型试验中采用弹簧拉力计提供附加重力场的局限性。由于拉力计与模型存在联合作用,改变了模型破坏机理和形式,使模型呈现为延性破坏,因而不能反映原型开裂后的实际承载特性。模型试验中附加荷载的施加方式需要改进。The behaviors of fracture in pre-notched gravity dam models are studied in this paper. On the basis of model test, the structural response curves and crack trajectories are introduced in the cohesive crack model by enrichment technique. The result is in good agreement with model test. It is found that additional gravity field formed by spring-dynamometers system to preserve the gravity similarity and physical similarity in model test has limitation. The failure mechanisms and patterns of the dam are affected by the interaction between spring-dynamometers and dam models leading to the ductile failure of model disagree with the real load-carrying of prototype after initial crack occurred.

关 键 词：有限元 非连续位移 粘结裂纹 物理相似 模型试验 

分 类 号：TV642.3[水利工程—水利水电工程]