尾砂胶结充填体损伤软-硬化本构模型

针对灰砂比分别为1∶4,1∶8和1∶10的尾砂胶结充填体进行了力学试验,得出了其在单轴压缩条件下的物理力学特性。根据统计损伤理论,在材料微元强度服从Weibull分布规律的基础上,引入有效损伤率参数来表征损伤材料的承载能力,建立尾砂胶结充填体在单轴压缩条件下的损伤软-硬化本构模型。经对比验算,尾砂胶结充填体损伤软-硬化模型与实验结果相吻合。该模型在体现尾砂胶结充填体损伤随机性、应变软化过程的同时,反映了尾砂胶结充填体峰后应变硬化过程及规律,为充填体强度设计提供了依据。

On Softening-hardening Intrinsically Constitutive Model for Damage of Tailings-cemented Filling Body

The mechanical tests of tailings-cemented filling body with cement-sand ratio of 1∶4,1∶8,and 1∶10 were conducted,obtaining the physical and mechanical properties under the uniaxial compressive condition.Then,according to the statistical damage theory and based on the principle that material micro-unit strength obeys Weibull distribution,a softening-hardening intrinsically constitutive model for damage of tailings-cemented filling body under the uniaxial compressive condition was established by introducing effective damage rate parameter which demonstrates the bearing capacity of material in damage.The contrast checking shows that the conclusion of softening-hardening constitutive model for the damage of filling body agrees with experimental results.The proposed model not only demonstrates damage randomness,strain softening process of tailings-cemented filling body but also reflects its strain hardening regularity after the pressure peak,providing the guide for strength design of filling body.