红层泥岩填料的力学特性及本构模型研究OACSTPCD

To construct road engineering in red mudstone regions,local materials are often used as subgrade fillers because of the shortage of materials and cost problems.To study the applicability of red mudstone fill material,weathered red mudstone fill material from a site in Yongdeng County,Gansu Province,was selected as the research object.A series of consolidated undrained(CU)triaxial shear laboratory tests was conducted to explore the effects of water content,confi-ning pressure,and compaction degree on stress-strain curve,peak(residual)strength,and shear strength index.Furthermore,different types of stress-strain curves were fitted with the corre-sponding models.The results show that water content,confining pressure,compaction degree affect the physical and mechanical properties of the red mudstone fill material.For curves confor-ming to strain softening law,the fitting effect of the generalized hyperbolic model of Shen Zhujiang is not good.For curves conforming to strain hardening law,the fitting effect of the Duncan-Chang model is good.The research results provide a reference for the treatment and ma-intenance of red mudstone subgrades in Gansu Province.