考虑重金属污染岩石侵入面损伤的本构模型

Constitutive model for damage of invasion surface of heavy metal-contaminated rock

基于酸碱质子理论,探讨了重金属污染物渗入岩石后的侵蚀机制,并通过对流-弥散模型分析了元素铅(Pb)、镉(Cd)、铜(Cu)、锌(Zn)的延伸性能;采用黏弹性和损伤性单体模型组合法建立了重金属污染岩石的三维组合延伸裂变模型,探讨了不同延伸速率下侵入面的变形规律,并通过三轴静载试验对模型拟合结果进行了验证。结果表明:不同的重金属污染物在岩石中的侵入性能与延伸性能不同;岩性不同的污染岩石在同种试验条件下本构曲线与组合模型的拟合结果具有较好的一致性。

Based on the acid-base proton theory,the erosion mechanism after heavy metal pollutants infiltrating into rock is discussed.The extension performances of lead(Pb),cadmium(Cd),copper(Cu),zinc(Zn) are analyzed by using the convection-diffusion model.By way of combining the viscoelastic model and the damage monomer model,a 3D extended-fissile model is established for heavy metal contaminated rock.The deformation rules of invaded surface are discussed under different extension rates.The model fitting results are verified by the data of axial static load tests.The results show that different heavy metal pollutants have different invasion and extension performances in rock,and there is a good agreement between the experimental stress-strain curves of contaminated rock with different lithologies in the same test conditions and the fitting results of the combination model.