摘要
依托某大桥扩建工程,采用分离式霍普金森压杆(SHPB)对不同干湿循环次数的节理试样进行加载速度分别为4、5、6 m/s的冲击试验,研究干湿循环次数和加载速度对动态力学性能和破裂规律的影响。结果表明:随着干湿循环次数增加,节理砂岩的动态破裂强度和动态弹性模量降低,但是试样破裂程度反而减少;随着加载速度的提高,节理砂岩的动态破裂强度提高,破碎程度增大,但是动态弹性模量几乎保持不变。
Based on the extension project of the bridge,split Hopkinson pressure bar(SHPB)was used to carry out the impact tests respectively at the loading speed of 4,5,6 m/s on the joint specimens in different numbers of dry-wet cycle,and then the influences of the loading speed and the number of dry-wet cycle on the dynamic mechanical property and fracture rules were studied.The result shows that,as the loading speed increases,the dynamic fracture strength of joint sandstone enhances and the degree of crushing increases,but the dynamic elastic modulus is almost the same;as the number of dry-wet cycle increases,the dynamic fracture strength and dynamic elastic modulus of the joint sandstone decrease,but the degree of crushing of the specimens is reduced.
作者
毛志鹏
MAO Zhipeng(Wenzhou Yongtaiwen Highway Co.,Ltd.,Zhejiang,Wenzhou 325000,Zhejiang,China)
出处
《路基工程》
2025年第4期80-86,共7页
Subgrade Engineering
