动态加载下的冻土力学性能实验研究  

Experimental Study on Mechanical Properties of Frozen Soil Under Dynamic Loading

作　　者：蔡天宇 CAI Tianyu(College of Civil Engineering and Architecture,Anhui University of Science&Technology,Huainan 250031,Anhui,China)

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232000

出　　处：《上海建材》2022年第3期24-27,共4页Shanghai Building Materials

摘　　要：利用霍普金森压杆装置进行动态冲击试验,研究了冻土材料在温度为-10℃、-20℃和-30℃,应变率为250 s^(-1)、450 s^(-1)和600 s^(-1)时的力学性能,分析了冻土材料在此条件下的应力-应变曲线。研究发现,冻土材料有显著的应变率效应和温度效应,冻土强度不但随应变率提高而提高,而且随温度降低而提高;同时冻土材料有屈服现象,在加载后仍有一定的承载能力。The dynamic impact test was carried out by using the SPHB device to study the mechanical properties of the frozen soil material at temperatures of-10℃,-20℃ and-30℃ and strain rates of 250 s^(-1),450 s^(-1) and 600 s^(-1),And analyzed the stress-strain curve of frozen soil material under this condition.Frozen soil material was found to have significant strain rate effect and temperature effect,The strength of frozen soil not only increases with the increase of strain rate,but also increases with the decrease of temperature.At the same time,the frozen soil material has the phenomenon of yielding,and still has a certain bearing capacity after loading.

关 键 词：冻土 动态冲击 应变率效应 温度效应 

分 类 号：P642.14[天文地球—工程地质学]