微细欠分选尾矿库地震液化流动变形机理研究

The deformation prediction of saturated tailing sand under the earthquake is a hot issue in recent years, but the understanding of deformation mechanism of tailing sand's liquefaction and flow is not enough, there are differences between the prediction results and the actual situation. The project is aimed at the scientific problems of the liquefaction and flow of the incomplete-separation micro tailing sand and tailing instability caused by earthquake, based on fluid mechanics in porous medium, advanced soil mechanics and earthquake engineering, the tailings instability mechanism under the effect of earthquake is revealed by tailings dynamic triaxial tests and simulation tests of tailing vibrating table, to understand physical parameters evolution laws of incomplete-separation tailing sand pore water pressure, volumetric strain and shear strain changing with dynamic load and deformation laws of tailings after liquefaction, the tailings dam fluid-solid coupling dynamics model is built considering growth rules of pore water pressure and deformation laws of tailing sand after liquefaction, inversion identification method of model parameters and numerical calculation method of the model are put forward relying on the self-developed calculating software based on the finite diffierence theory, to study deformation characteristics of tailings dam under different conditions of seismic wave,frequency and duration, and the numerical calculation results and test results are verified to provide scientific basis for project construction and reinforce of tailings dam and provide theoretical and applied basis for enrichment and expansion of granular dynamics theory.

饱和尾矿砂在地震作用下的变形预测是近年来一直被广泛关注的热点问题，但是对于尾矿砂液化流动变形机制认识不足，预测结果与实际情况存在差异。项目针对地震作用下微细欠分选尾矿砂液化流动变形，导致尾矿库失稳的关键科学问题，基于多孔介质渗流力学、高等土力学、地震工程学等多学科交叉理论，通过尾矿砂动三轴试验和尾矿库振动台相似模拟试验，分析地震作用下尾矿库的失稳机制；揭示微细欠分选尾矿砂孔隙水压力、体应变和剪应变等物性参数随动载作用的演变规律，及液化后的变形规律，建立综合考虑尾矿砂孔压增长规律和液化后变形规律的尾矿库流-固耦合动力学模型，并通过自行开发有限差分计算软件，提出模型参数反演辨识方法及模型的数值计算方法，研究不同输入地震波形、不同频率和不同持时条件下的尾矿库变形特性，并将数值计算结果与试验结果相验证，为尾矿库工程建设与加固提供科学依据，同时对丰富和拓展散体动力学理论提供理论和应用基础。

地震载荷作用下尾矿砂液化造成尾矿库失稳是学者们关注的热点问题，其中在微细欠分选尾矿砂的液化流动变形机理及预测领域仍需进行大量研究。项目针对地震作用下微细欠分选尾矿砂液化流动变形及尾矿库失稳问题，基于多孔介质渗流力学、高等土力学等多学科交叉理论，通过尾矿砂动三轴试验和尾矿库振动台相似模拟试验，得出了微细欠分选尾矿砂液化流动变形规律，分析了地震作用下尾矿库的失稳机制；揭示微细欠分选尾矿砂孔隙水压力、体应变和剪应变等物性参数随动载作用的演变规律，建立综合考虑尾矿砂孔压增长规律和液化后变形规律的尾矿库流-固耦合动力学模型，并自行开发有限差分计算软件，提出模型参数反演辨识方法及模型的数值计算方法，研究不同输入地震波形、不同频率和不同持时条件下的尾矿库变形特性，并将数值计算结果与试验结果相验证，丰富了尾矿库动力特性的研究，拓展了散体动力学理论应用范围，使得尾矿库工程建设与加固有了科学依据。