Abstract:

Xiaopeng Peng^1,2, Lijie Guo^1,2*, Guangsheng Liu^1,2, Xiaoming Wei^1,2, Lei Zhang^1,2

1. Beijing General Research Institute of Mining and Metallurgy, Beijing 100160, China

2. National Centre for International Research on Green Metal Mining, Beijing 102628, China

The quality of cemented backfill mass is of great importance for a mine utilizing mining with backfill, and then the quality evaluation of backfill mass has long been a research focus for mining researchers and engineers. Generally, the backfill mass quality evaluation can be analyzed based on the strength values and distribution of the samples drilled from in-situ backfill mass, which can show the highest strength point or the position of weak quality areas, while the deep causes leading to the changes and distribution cannot be acquired. Therefore, in this study, the quality evaluation method based on segregation degree analysis has been described, which mainly utilizes the measurement results of cemented contents and porous properties of samples. Based on this method, the strength distributions and segregation indexes of cemented backfill samples of a real mine have been analyzed, and following results have been worked out: (1) The cement content increases gradually along drilling hole, while the porosity has a fluctuating trend, which are all different from the strength distribution. (2) The strength of sample is not just determined by cement content, but is coupled affected by cement content and porous properties. (3) By analyzing the segregation properties of drilled samples, some optimization suggestions about the particle size distribution of backfill materials can be gained.

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Lei Zhang