摘要
为研究不同细颗粒含量及形状对钙质混合砂力学特性的影响,采用角形石英粉和圆形玻璃珠作为细颗粒材料,按不同配比分别与钙质砂混合,通过环剪试验对钙质混合砂强度特性和破碎特征进行研究。结果表明:两种混合砂在中密状态下软化特性明显,软化系数随细颗粒含量的增加,呈现出先增大后减小的规律,在细颗粒含量为10%时达到最大值,细颗粒含量相同时,含玻璃珠试样的软化系数更大;钙质砂存在明显的表观黏聚力,并随着细颗粒含量增加而减小,含玻璃珠试样因嵌固咬合能力更低,其下降趋势明显大于含石英粉试样;纯钙质砂变形表现为剪胀,随着细颗粒含量增加,混合砂剪缩量逐渐增加,峰值强度、相对破碎率逐渐降低,含玻璃珠混合砂变化更为显著。
In order to study the influences of different contents and shapes of fine particle on the mechanical properties of calcareous mixed sand,the angular quartz powder and round glass beads are used as the fine particle materials and mixed with the calcareous sand in different proportions,and the strength characteristics and crushing characteristics of the calcareous mixed sand are studied and analyzed through the ring shear tests.The results show that the softening characteristics of the two kinds of mixed sand are obvious in the medium density state.The softening coefficient increases first and then decreases with the increase of the fine content,and reaches the maximum value when the fine content is 10%.The softening coefficient of the samples containing the glass beads is larger when the fine content is the same.The apparent cohesion of the calcareous sand is obvious and decreases with the increase of the fine content,and the decreasing trend of the samples containing the glass beads is obviously larger than that of the samples containing the quartz powder because of their lower embedding and biting capability.The deformation of the pure calcareous sand appears in the form of dilatancy,and with the increase of the content of the fine particle,the shear shrinkage of the mixed sand gradually increases,the peak strength and relative breakage rate gradually decrease,and the change of the mixed sand containing the glass beads is more significant.
作者
李涛
赵洪扬
翁勃航
黄晓冀
张钟毓
LI Tao;ZHAO Hongyang;WENG Bohang;HUANG Xiaoji;ZHANG Zhongyu(School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2023年第7期1517-1525,共9页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(51508556)
中央高校基本科研业务费专项资金项目(2020YJSLJ14)
越崎青年学者项目(800015Z1166)。
关键词
钙质混合砂
细颗粒含量
颗粒形状
抗剪强度
颗粒破碎
calcareous mixed sand
fine particle content
particle shape
shear strength
particle crushing
