不同胶凝材料固化底泥力学特性与损伤本构模型研究OA

To investigate the evolution of the mechanical properties of dredged sediment solidified with different cementitious materials and under varying solidification parameters,unconsolidated-undrained(UU)triaxial tests were first conducted on specimens prepared with ordinary Portland cement,self-developed BC,SWCM-IV,and BSWCM-IV cementitious materials,as well as sludge biochar-modified sediment.Subsequently,based on statistical physics,damage mechanics,and the modified Mohr-Coulomb yield criterion,statistical damage constitutive models were established for different cementitious materials and solidification parameters to analyze the evolution of constitutive parameters and failure modes of the solidified sediment.The results indicate that increasing the initial water content reduces both the internal friction angle and cohesion of the solidified sediment,whereas.higher compaction and cementitious material content enhance these strength parameters.When the peak strength(σ1f)is significantly greater than the confining pressure(σ3),the stress-strain response exhibits brittle strain softening;otherwise,it demonstrates plastic strain hardening.Higher specimen strength and lower confining pressure result in greater brittleness and a more pronounced cleavage effect caused by cumulative damage.Moreover,sludge biochar further increases the brittleness of the solidified sediment.These findings provide theoretical support for the resource utilization of river and lake sediments and for evaluating the mechanical behavior and deformation characteristics of solidified sedient.