Thickening mechanism under high compression stress based on rheological properties: Comparison between compression effect and compression-shear coupling effect
Comparison between compression effect and compression-shear coupling effect
DOI:
https://doi.org/10.29393/ppudec-19thrb60019Keywords:
High compression stress, Compression-shear coupling effect, Double yield stress, Concentration, Thickening mechanismResumen
Tailings thickening is the primary link and key technology of cemented paste backfill (CPB) technology. However, the concentration of thickened tailings often is substandard because of the unclear of thickening mechanism. Therefore, this paper inveterated the thickening mechanism based on the rheological properties of tailings. Firstly, the double yield stress (compressive and shear yield stress) and concentration evolution under compression and compression-shear coupling effects were tested, respectively. And then the correlation analysis between concentration and double yield stress was carried out. The concentration shows a power function of the double yield stress, and shear yield stress is a linear function of the compressive yield stress. It is found that the linear fitting proportional coefficients under the compression effect are lower than those under the compression-shear coupling effect. The full compression stress range is divided into the low and high compression stress ranges and the shear yield stress-compressive yield stress proportional coefficients in the two compression stress ranges are linearly fitted. It is found that the proportional coefficients in the low compression stress range are lower than those in the high compression stress range under the compression effect, but the opposite results are shown under the compression-shear coupling effect, which shows that the introduction of rake-shearing action by the compression-shear coupling effect mainly improves the thickening rate and the thickening effect in the low compression stress range. Moreover, by introducing the rake-shearing action, the concentration growth ratio also confirms that the compression-shear coupling effect improves the thickening effect in the low compression stress range. Furthermore, from the evolution offloc structure and drainage channels, the thickening mechanism of the compression effect and compression-shear coupling effect was revealed. The results are beneficial for obtaining a satisfied underflow concentration in CPB.
Citas
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