中南大学学报（自然科学版）2025，Vol.56Issue(4)：1397-1404,8.DOI:10.11817/j.issn.1672-7207.2025.04.012
基于起裂荷载确定软岩抗拉强度的试验验证
Experimental verification of determining the tensile strength of soft rock based on the crack initiation load
摘要
Abstract
To address the deficiency of overestimating rock tensile strength based on peak load in ring splitting tests,splitting tests were conducted on sandstone ring specimens with different inner-to-outer diameter ratios(0.2,0.3,0.4,0.5,0.6).Three methods(acoustic emission,strain gauges and digital image correlation technology)were used to capture the crack initiation point of tensile cracks,to improve the accuracy of ring splitting tests for testing rock tensile strength.Brazilian splitting and direct tensile tests were conducted on sandstone to verify the accuracy of the tensile strength determined in ring splitting tests.The results show that the crack initiation load decreases with the increase of the inner-to-outer diameter ratio.When the inner-to-outer diameter ratios are 0.5 and 0.6,the tensile strength calculated based on the crack initiation load is close to the direct tensile strength(with the minimum relative deviation of only 3.3％).The ring-splitting test based on the crack initiation point is a reliable method for testing the indirect tensile strength of soft rocks.关键词
抗拉强度/圆环劈裂试验/起裂荷载/内外径比Key words
tensile strength/ring-splitting test/crack initiation load/inner-to-outer diameter ratio分类
建筑与水利引用本文复制引用
马春德,谭观霜,张俊杰,赵俊康,阳文源..基于起裂荷载确定软岩抗拉强度的试验验证[J].中南大学学报（自然科学版）,2025,56(4):1397-1404,8.基金项目
国家自然科学基金资助项目(52074352) （52074352）
湖南省自然科学基金资助项目(2023JJ30680)(Project(52074352)supported by the National Natural Science Foundation of China （2023JJ30680）
Project(2023JJ30680)supported by the Natural Science Foundation of Hunan Province) （2023JJ30680）
