岩土工程学报2013，Vol.35Issue(3)：531-539,9.
单轴循环冲击下岩石的动力学特性及其损伤模型研究
Dynamic characteristics and damage model for rock under uniaxial cyclic impact compressive loads
摘要
Abstract
Experiments on dynamic mechanical performance of granite are carried out under uniaxial cyclic impact loads by using a modified large diameter split Hopkinson pressure bar (SHPB). The dynamic characteristics of the granite specimens and the laws of the energy absorption are analyzed. The cumulative damage of the granite specimens is calculated by use of the dynamic statistics damage model based on the Weibull random distribution. The laws of the cumulative damage of the granite specimens are also analyzed through the stress-strain curves. The results show that, in the cyclic impact compressive tests, with the increase of repeated action times of impact loads, the deformation modulus of granite decreases, the yield strain increases and the yield stress shows a decreasing trend. The value of cumulative specific energy increases with the increase of impact times, which increases slowly before the failure of the specimen and increases rapidly at its failure. The model curves and the test curves have good consistency, which shows that this model can reasonably reflect the relationship of the stress-strain and stress-strain rate. The value of cumulative damage increases with the increase of impact times, and its increasing rate changes from slowly to rapidly. Before the failure of the specimen, the cumulative damage increases smoothly, and the main increment occurs in the last impact when the specimen is broken.关键词
岩石力学/霍普金森压杆/动态压缩强度/循环载荷/损伤Key words
rock mechanics/ split Hopkinson pressure bar (SHPB)/ dynamic compressive strength/ cyclical load/ damage分类
建筑与水利引用本文复制引用
朱晶晶,李夕兵,宫凤强,王世鸣..单轴循环冲击下岩石的动力学特性及其损伤模型研究[J].岩土工程学报,2013,35(3):531-539,9.基金项目
国家重点基础研究发展计划("973")项目(2010CB732004):国家自然科学基金项目(50934006,41272304,41102170) （"973"）
