Experimental study on the liquefaction characteristics of tailing sand under earthquake action and establishment of flow model

The liquefaction of tailings sand caused by seismic loads is a major problem for the safety of tailings ponds. Its liquefaction characteristics largely determine the stability of the dam. To study the flow characteristics of tailings sand after liquefaction under earthquake action, the flow characte...

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Bibliographic Details
Published in:Arabian journal of geosciences 2020-07, Vol.13 (14), Article 642
Main Authors: Jin, Jiaxu, Li, Yahao, Cui, Hongzhi, Zhang, Xinlei, Xiao, Xiaochun, Lv, Xiangfeng
Format: Article
Language:English
Subjects:
Dam stability
Earth and Environmental Science
Earth science
Earth Sciences
Earthquake loads
Earthquakes
Experimental research
Flow characteristics
Flow equations
Flow stability
Ground motion
Laboratory experimentation
Liquefaction
Mine tailings
Original Paper
P-waves
Sand
Seismic activity
Seismic stability
Seismic waves
Shake table tests
Shear
Shear strain
Shear thinning (liquids)
Strain rate
Tailings
Viscosity
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Summary:The liquefaction of tailings sand caused by seismic loads is a major problem for the safety of tailings ponds. Its liquefaction characteristics largely determine the stability of the dam. To study the flow characteristics of tailings sand after liquefaction under earthquake action, the flow characteristics of the tailings sand were liquefied by conducting a shaking table test. The flow equation is derived, and the discriminant factor of liquefaction flow is proposed. After liquefaction, the apparent viscosity in the tailings first decreases instantaneously, and then increases with the strain rate, but the apparent viscosity is almost unchanged. According to the experimental research of three types of seismic waves (Traft wave, El Centro wave, and Shanghai wave), the greater the ground motion amplitude is, the more obvious the shear thinning effect of the tailings sand and the more obvious the flow state. The proposed flow model is compared with the existing research results, which shows that the tailings sand is a fluid model after liquefaction and has good applicability. From the perspective of the relationship between the apparent viscosity and shear strain rate, the flow characteristics of saturated sand after liquefaction are studied, showing that the model is practical.
ISSN:1866-7511
1866-7538
DOI:10.1007/s12517-020-05533-1