Abstract
Construction using geofabriform is a new promising technology to build fine grain tailings dam. Large-scale shaking table tests are conducted in this study to investigate the dynamic performances in terms of horizontal acceleration and displacement of the tailings dam with and without geofabriform subject to horizontal earthquakes. Test results indicate that the seismic performance of the tailings dam with geofabriform is significantly better than that of tailings dam without geofabriform. The two types of tailings dams have different failure modes under the action of earthquake. The acceleration amplification factor(Am), vertical displacement and horizontal displacement of the tailings dam with geofabriform under the same seismic acceleration input are smaller than that of the tailings dam without geofabriform, the maximum attenuation amplitude of the Am at the dam slope reaches to 81%. The horizontal displacements of the two types of dams are nonlinearly distributed in the height direction and the geotextile bags of the tailings dam have an upward displacement and are tilted upward. According to the failure mode of the tailings dam with geotextile bags, it is recommended to strengthen the drainage measures and set up anti-slide piles at the bottom of the geotextile bags body to strengthen the tailings dam.
Highlights
With the continuous improvement of the beneficiation technology and recovery rate, tailings have less coarse particles larger than 0.074mm and more fine particles less than 0.03mm
If the traditional upstream storage method is used for fine-grained tailings, problems such as difficulty in dam construction, poor drainage of the dam body, slow slope of the sedimentary beach, and poor stability are often encountered
The fine tailings dams constructed by an upstream method may have many issues, such as difficulties in dam construction, low permeability, the slow consolidation of tailings and poor stability of the dam
Summary
With the continuous improvement of the beneficiation technology and recovery rate, tailings have less coarse particles larger than 0.074mm and more fine particles less than 0.03mm. If the traditional upstream storage method is used for fine-grained tailings, problems such as difficulty in dam construction, poor drainage of the dam body, slow slope of the sedimentary beach, and poor stability are often encountered. The geofabriform method employs a geotextile bag filled with natural soil material, tailings, and other bulk materials to constitute the geotechnical composite soil with specific strength by drainage and consolidation[1]. The contrastive analysis of the dynamic response of the tailings dam with and without geofabriform under different horizontal earthquakes is investigated by large-scale shaking table model test It aims to provide theoretical support for promotion of application of the tailings dam based on geofabriform method
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