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| Pressure bleeding effect of waste rock tailing cement paste and estimation of thickness of pipeline transportation boundary layer |
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Received:February 01, 2021
Revised:March 08, 2021
Accepted:March 10, 2021
Published Online:April 27, 2022
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| DOI： |
| KeyWord:pressure bleeding effect; lateral compression; calculation model; pipeline transportation; boundary layer thickness |
| Author | Institution |
| YANG Tian-yu |
School of land and resources engineering,Kunming University of science and technology;Yunnan,China;Dahongshan Copper Mine of Yuxi Mining Co,Ltd;Yunnan,China |
| QIAO Deng-pan |
School of land and resources engineering,Kunming University of science and technology |
| Deng Tao |
School of land and resources engineering,Kunming University of science and technology |
| WANG Jun |
School of land and resources engineering,Kunming University of science and technology |
| ZHANG Xi |
Dahongshan Copper Mine of Yuxi Mining Co,Ltd |
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| Abstract: |
| In order to explore the pressure bleeding effect and boundary layer effect of paste filling slurry in the process of pipeline transportation, the side limit compression test and pressure bleeding test were carried out on the paste mixture filled with tailings from a mine. The results show that: The initial void ratio, volume concentration, pressure and pressure acting time of the paste mixture filled with waste rock tailings have a great influence on the pressure bleeding rate. According to the deformation law of e-p curve of filling material, the calculation model of pressure bleeding rate of filling paste slurry is put forward. The material parameter A and stress parameter n that affect the pressure bleeding effect of filling paste mixture are defined. The gradation factor is introduced into the calculation model of pressure bleeding rate, and the evolution rule of stress parameters with stress and initial voidage is analyzed. It is considered that the stress parameter is a polynomial function of compressive stress and initial void fraction. The higher the degree of function, the higher the precision. It is considered that the thickness of the boundary layer is not invariable, and the estimation method of the boundary layer based on the effect of pressure bleeding is established. |
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