中南大学学报（自然科学版）2024，Vol.55Issue(9)：3494-3504,11.DOI:10.11817/j.issn.1672-7207.2024.09.022
不同恒温时间加热下花岗岩冲击压缩力学特性及破碎特征
Impact compression mechanical properties and crushing characteristics of granite at different constant temperature heating time
摘要
Abstract
In order to study the effect of real-time high temperature action at different constant temperature time on the mechanical properties and failure characteristics of granite shock compression,the SHPB impact compression test at high temperature and screening test were carried out.Firstly,the granite was heated to 700℃and subjected to five different time length constant temperature heat treatment of 0,30,60,90 and 120 min.Secondly,SHPB test at high temperature was carried out by synchronous rod device without cooling the sample.The crushed specimens were collected for screening test.Finally,combined with the data of compressive strength and fractal dimension,the mechanical properties and crushing characteristics of granite were analyzed.The results show that the constant temperature time has a great influence on the dynamic compressive strength of granite,and the compressive strength of the specimen decreases significantly with the increase of the constant temperature time.The degree of granite fragmentation increases with the increase of constant temperature time,which shows that the number of fine blocks in broken specimens gradually decreases and the number of fine particles increases.The fractal dimension of granite impact compression failure at different constant temperature duration is concentrated in the range of 2.2-2.7,and presents a positive correlation with the constant temperature duration.The dynamic compressive capacity and macro fracture fractal characteristics of granite at real-time high temperature have obvious strain rate strengthening effect.关键词
恒温时间/花岗岩/高温时SHPB/冲击压缩力学特性/分形维数Key words
constant temperature time/granite/SHPB at high temperature/dynamic compression mechanical properties/fractal dimension分类
建筑与水利引用本文复制引用
贾宇,翟越,李宇白,谢梓涵,王奥晨,殷溥隆..不同恒温时间加热下花岗岩冲击压缩力学特性及破碎特征[J].中南大学学报（自然科学版）,2024,55(9):3494-3504,11.基金项目
国家自然科学基金资助项目(211026220437) （211026220437）
陕西省自然科学基础研究计划联合基金资助项目(2022JC-LHJJ-16) （2022JC-LHJJ-16）
陕西省技术创新引导计划项目(2022KXJ-107)(Project(211026220437)supported by the National Natural Science Foundation of China （2022KXJ-107）
Project(2022JC-LHJJ-16)supported by the Shaanxi Province Natural Science Basic Research Program Joint Fund （2022JC-LHJJ-16）
Project(2022KXJ-107)supported by the Shaanxi Province Technology Innovation Guidance Program) （2022KXJ-107）
