工程地质学报2023，Vol.31Issue(6)：1811-1819,9.DOI:10.13544/j.cnki.jeg.2021-0574
制样含水率影响红黏土强度特性的微观机理研究
MECHANISM ON STRENGTH CHARACTERISTIC OF LATERITIC SPECI-MENS PREPARED WITH DIFFERENT WATER CONTENTS
摘要
Abstract
The compacted lateritic specimens,prepared at dry side of optimum water content(dry specimens)and wet side of optimum water content(wet specimens)in proctor,were applied suctions by axial transform technique(ATT)or vapor equilibrium technique(VET),respectively.The specimens were firstly carried out suction-controlled shear tests under constant net stress by unsaturated triaxial apparatus,to investigate the effect of specimen prepared water content on the strength characteristic of lateritic clay.The obtained results illustrate that peak strength and di-latancy of specimens increase with an increase in suction,no matter dry specimens or wet specimens.And strain-softening and shear-dilatancy in the stress-strain curves are observed in the specimens with high suctions.In addi-tion,the dry specimen has higher peak strength and more dilatancy than that of wet specimen at the same suction,which verifies that the specimen prepared water content has great influence on the strength characteristics of com-pacted lateritic specimens.Then,the results obtained from the mercury intrusion porosimetry(MIP)on both dry and wet specimens,indicate that the pore size distributions(PSDs)are different for dry and wet specimens with the same void ratio and suction.The bimodal PSDs exhibits in the dry specimens,while the unimodal PSDs exhibits in the wet specimens.Besides,the dry specimen has higher peak strength than that of wet specimen with the same void ratio,which can be attributed to less cumulative volume of macro-pores(d＞0.2 μm).Moreover,the peak strength of clay exponential decreases with an increase in the cumulative volume of macro-pores.关键词
红黏土/压实样/应力-应变曲线/峰值强度/孔径分布曲线Key words
Lateritic clay/Compacted specimens/Stress-strain curves/Peak strength/Pore size distribution分类
天文与地球科学引用本文复制引用
金盼,陈波,胡云世..制样含水率影响红黏土强度特性的微观机理研究[J].工程地质学报,2023,31(6):1811-1819,9.基金项目
浙江省自然科学基金项目(资助号:LZY21D020001),衢州市重点科技攻关项目(资助号:2022k93,2023k220).This research is supported by Zhejiang Provincial Natural Science Foundation of China(Grant No.LZY21D020001)and Key Science and Technolo-gy Projects of Quzhou(Grant Nos.2022k93,2023k220). （资助号:LZY21D020001）
