水泥改性废弃泥浆损伤模型及时间效应

Damage model and time effect of cement-modified waste slurry

通过无侧限抗压强度试验,分析了水泥改性泥浆(CMS)的应力-应变曲线、无侧限抗压强度(UCS)及弹性模量,并建立了CMS弹性模量时间效应模型。基于损伤力学,采用粒子群优化(PSO)算法识别随机场参数,建立了CMS细观随机损伤模型,并提出了随机场参数时间效应模型。结果表明:①CMS的应力-应变曲线为软化型曲线,水泥最佳掺量为20%,弹性模量与水泥掺量和龄期具有函数关系。②细观随机损伤模型能够描述CMS的应力-应变关系,并且随机场参数λ与养护时间具有函数关系。③通过损伤变量D与应变演变规律,能从细观随机损伤角度解释CMS宏观应力-应变特性。

Through the unconfined compressive strength test,the stress-strain curve,unconfined compressive strength,and elastic modulus of cement-modified slurry(CMS)were analyzed,and the time effect model of CMS elastic modulus was established.Based on damage mechanics,a particle swarm optimization(PSO)algorithm was used to identify random field parameters,a CMS mesoscopic random damage model was established,and a random field parameter time effect model was proposed.The results show that:①the stress-strain curve of CMS is a softening curve,the optimal cement content is 20%,and the elastic modulus is a function of cement content and curing time.②The mesoscopic random damage model can describe the stress-strain relationship of CMS,and the random field parameterλhas a functional relationship with the curing time.③The macroscopic stress-strain characteristics of CMS can be explained from the perspective of meso-random damage through the damage variable D and strain evolution.