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单轴压缩下结构充填体的能耗特征及本构模型与验证

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以矿山分层充填为背景,针对由不同力学性能基体组合而成的三层复合结构充填体,基于初始超声波速和耗散能演化特征,并借助Logistic模型,建立了能够描述考虑层间结构和荷载耦合作用下完整的损伤变量方程.进一步结合损伤力学理论和有效介质理论,构建了考虑压密段的结构充填体分段本构模型.结果表明:根据耗散能的演化特征可将结构充填体的变形破坏特征划分为三个阶段,即初始累积损伤阶段、快速损伤阶段和加速损伤阶段,损伤加速的转折点位置与中间层的力学性质有关;损伤变量呈现"S"形增长的演化规律,初始损伤与中间层灰砂比和高度比之间呈指数关系,最大损伤率随着中间层强度的降低而降低;建立的本构模型能够较好地描述应力-应变过程,与实测数据吻合度较高.
Energy dissipation characteristics and constitutive model of structural backfill under uniaxial compression
With the background of mine layered filling,based on the initial ultrasonic velocity and dissipation energy evolution characteristics for three-layer composite structural backfills,and with Logistic model,a damage variable equation that could describe the complete damage process under the coupling effect of the interlayer structure and loading was established.Further,a segmented constitutive model of the structural backfill was constructed using damage mechanics and effective medium theories.The results reveal that the deformation damage characteristics of the structural backfill can be divided into three stages,i.e.initial cumulative damage,rapid damage and accelerated damage,and the location of the turning point of damage acceleration is related to the mechanical properties of the middle layer.The damage variable shows S-shaped growth,the initial damage is exponentially related to the c/t ratio and h/H ratio of the middle layer,and the maximum damage rate decreases with the decrease of the middle layer strength.The established constitutive model is able to describe the stress-strain process better,and has a high degree of consistency with the actual measured data.

structural backfillenergy evolutiondamage variableenergy dissipation characteristicsconstitutive model

杨雷、王炳文、刘臣毅、甘肃、于辉

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中国矿业大学(北京)能源与矿业学院,北京 100083

山东理工大学 资源与环境工程学院,淄博 255000

结构充填体 能量演化 损伤变量 能耗特征 本构模型

国家重点研发计划资助项目

2018YFC0808403

2024

中国有色金属学报
中国有色金属学会

中国有色金属学报

CSTPCD北大核心
影响因子:1.108
ISSN:1004-0609
年,卷(期):2024.34(10)