Dуnаmiс Sрlitting Сhаrасtеristiсs оf Frееzе-Thаwеd Sаndstоnе аt Diffеrеnt Lоаding Rаtеs

被引：0
|
作者：
Jia P. [1 ]
Mao S.-Z. [1 ]
Qian Y.-J. [1 ]
Lu J.-L. [1 ]
机构：
[1] School of Resources & Civil Engineering, Northeastern University, Shenyang
来源：
Dongbei Daxue Xuebao/Journal of Northeastern University | 2024年 / 45卷 / 01期
关键词：
damage; dynamic tensile strength; energy dissipation; freeze-thaw cycle; loading rate;
D O I：
10.12068/j.issn.1005-3026.2024.01.014
中图分类号：
学科分类号：
摘要：
In order to study the effects of loading rate and freeze-thaw cycles on the dynamic splitting characteristics of sandstone，static and dynamic splitting tests with different loading rates were conducted on sandstone subjected to 0，25，50，75 and 100 freeze-thaw cycles，and the static and dynamic tensile strength of freeze-thaw sandstone，as well as the change law of dissipation energy under impact load were discussed. The results show that the static and dynamic tensile strength，the P-wave velocity and the mass loss rate of freeze-thaw sandstone deteriorate with an increase in the number of freeze-thaws cycles. The dynamic strength increase factor （DIF）increases with the increase of freeze-thaw cycles and loading rate，and a higher degree of the freeze-thawing damage in sandstone results in a more significant increase in DIF with loading rate. The dynamic tensile strength prediction model based on freeze-thaw damage and loading rate can reflect the strength change of sandstone effectively. The greater the freeze-thaw damage of sandstone，the faster the change of dynamic tensile strength with loading rate. The dissipation energy under impact load decreases with the increase of freeze-thaw cycles and increases with higher loading rate. © 2024 Northeast University. All rights reserved.
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页码：111 / 119
页数：8
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