Experimental Investigation of the Size Effect of Rock under Impact Load

被引：7

作者：

Zhou, Jun ^{[1
]}

Zhao, Guangming ^{[1
,2
]}

Meng, Xiangrui ^{[1
]}

Liu, Chonyan ^{[1
]}

Ma, Longpei ^{[1
]}

Xu, Wensong ^{[1
,2
]}

Cheng, Xiang ^{[1
]}

机构：

[1] Anhui Univ Sci & Technol, State Key Lab Deep Coal Mine Min Response & Disast, Huainan 232000, Peoples R China

[2] Anhui Univ Sci & Technol, Sch Safety Sci & Engn, Huainan 232000, Peoples R China

来源：

MINERALS | 2023年 / 13卷 / 01期

基金：

中国国家自然科学基金;

关键词：

rock strength; size effect; strain rate; Weibull distribution; improved formula; STRAIN-RATE; STRENGTH; FRACTURE;

D O I：

10.3390/min13010043

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

When measuring the compressive strength of rock, size and strain rate are the two main influencing factors. To study the rock strength size effect, rock specimens with length-to-diameter ratios of 0.5, 0.6, 0.7, 0.8, 0.9 and 1 were subjected to static loading tests using the RMT rock mechanics test system and dynamic loading with the split Hopkinson pressure bar, respectively. Based on the Weibull size-effect formula, the experimental results were compared with the improved formula obtained. The results show that rock strength is influenced by size and strain rate. Both the dynamic increase factor and rock strength are proportional to strain rate. The different failure modes of rock with size variation and strain rate variation are described according to the failure process of the specimens. The same length-to-diameter ratio specimens produced more fragments with a strain rate increase. Under the same strain rate of impact, the larger the rock specimen, the finer the broken fragments. Considering the factor of strain rate in the Weibull size-effect formula, the calculated result is accurate. The improved size-effect formula could be used to better elaborate the potential mechanisms of dynamic rock strength. In the unified theoretical formula containing static and dynamic loads, the relationship of rock strength, size and strain rate is well described.

引用

页数：13