Experimental Study on Factors Influencing the Strength Distribution of In Situ Cemented Tailings Backfill
Previous studies have found that the strength of in situ cemented tailings backfill usually presents an S-shaped distribution, which decreases first, then increases, and decreases thereafter along the direction of slurry flow. In this study, to explore the factors determining the distribution, a sim...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-12-01
|
| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/11/12/2059 |
| _version_ | 1797502447448489984 |
|---|---|
| author | Xiaopeng Peng Lijie Guo Guangsheng Liu Xiaocong Yang Xinzheng Chen |
| author_facet | Xiaopeng Peng Lijie Guo Guangsheng Liu Xiaocong Yang Xinzheng Chen |
| author_sort | Xiaopeng Peng |
| collection | DOAJ |
| description | Previous studies have found that the strength of in situ cemented tailings backfill usually presents an S-shaped distribution, which decreases first, then increases, and decreases thereafter along the direction of slurry flow. In this study, to explore the factors determining the distribution, a similar model test of cemented tailings backfill was carried out. The distribution law of grain size composition and the cement content of backfill materials along the flow direction were experimentally studied, and the comprehensive factor influencing the strength distribution was analyzed. The results show that, firstly, near the feeding point, there are more coarse particles, whereas the content of fine particles is higher farther away. The measured maximum median particle size can be more than three times the minimum value. Secondly, the cement content increases gradually along the flow direction and reaches the peak at the end of the model, which can be more than twice the minimum value, indicating that the degree of segregation is significant. Thirdly, the strength distribution of cemented backfills is comprehensively determined by both the particle size distribution (PSD) and the cement content. The maximum value appears neither at the point with peak median particle size, nor at the point with the highest cement content. Lastly, there is a strong linear correlation between the strength of cemented backfills and the strength factor (SF), which is defined as the product of the uniformity coefficient and cement content of filling materials, indicating that the SF can be used to quantitatively reflect the comprehensive effects of PSD and cement content on the strength. As SF is a comprehensive quantitative index reflecting the distribution of strength, it will be further studied in later research to acquire more experimental results of the relationship between sample strength and SF, which will be meaningful for the quality evaluation of in situ cemented backfills, and the optimization of backfill system. |
| first_indexed | 2024-03-10T03:34:10Z |
| format | Article |
| id | doaj.art-65d66d04547740b7ace0d44a5f069d21 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T03:34:10Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-65d66d04547740b7ace0d44a5f069d212023-11-23T09:34:54ZengMDPI AGMetals2075-47012021-12-011112205910.3390/met11122059Experimental Study on Factors Influencing the Strength Distribution of In Situ Cemented Tailings BackfillXiaopeng Peng0Lijie Guo1Guangsheng Liu2Xiaocong Yang3Xinzheng Chen4BGRIMM Technology Group, Institute of Mining Engineering, Beijing 100160, ChinaBGRIMM Technology Group, Institute of Mining Engineering, Beijing 100160, ChinaBGRIMM Technology Group, Institute of Mining Engineering, Beijing 100160, ChinaBGRIMM Technology Group, Institute of Mining Engineering, Beijing 100160, ChinaBGRIMM Technology Group, Institute of Mining Engineering, Beijing 100160, ChinaPrevious studies have found that the strength of in situ cemented tailings backfill usually presents an S-shaped distribution, which decreases first, then increases, and decreases thereafter along the direction of slurry flow. In this study, to explore the factors determining the distribution, a similar model test of cemented tailings backfill was carried out. The distribution law of grain size composition and the cement content of backfill materials along the flow direction were experimentally studied, and the comprehensive factor influencing the strength distribution was analyzed. The results show that, firstly, near the feeding point, there are more coarse particles, whereas the content of fine particles is higher farther away. The measured maximum median particle size can be more than three times the minimum value. Secondly, the cement content increases gradually along the flow direction and reaches the peak at the end of the model, which can be more than twice the minimum value, indicating that the degree of segregation is significant. Thirdly, the strength distribution of cemented backfills is comprehensively determined by both the particle size distribution (PSD) and the cement content. The maximum value appears neither at the point with peak median particle size, nor at the point with the highest cement content. Lastly, there is a strong linear correlation between the strength of cemented backfills and the strength factor (SF), which is defined as the product of the uniformity coefficient and cement content of filling materials, indicating that the SF can be used to quantitatively reflect the comprehensive effects of PSD and cement content on the strength. As SF is a comprehensive quantitative index reflecting the distribution of strength, it will be further studied in later research to acquire more experimental results of the relationship between sample strength and SF, which will be meaningful for the quality evaluation of in situ cemented backfills, and the optimization of backfill system.https://www.mdpi.com/2075-4701/11/12/2059backfill slurrystrength of cemented backfillinhomogeneity of cemented backfillcemented tailings backfill |
| spellingShingle | Xiaopeng Peng Lijie Guo Guangsheng Liu Xiaocong Yang Xinzheng Chen Experimental Study on Factors Influencing the Strength Distribution of In Situ Cemented Tailings Backfill Metals backfill slurry strength of cemented backfill inhomogeneity of cemented backfill cemented tailings backfill |
| title | Experimental Study on Factors Influencing the Strength Distribution of In Situ Cemented Tailings Backfill |
| title_full | Experimental Study on Factors Influencing the Strength Distribution of In Situ Cemented Tailings Backfill |
| title_fullStr | Experimental Study on Factors Influencing the Strength Distribution of In Situ Cemented Tailings Backfill |
| title_full_unstemmed | Experimental Study on Factors Influencing the Strength Distribution of In Situ Cemented Tailings Backfill |
| title_short | Experimental Study on Factors Influencing the Strength Distribution of In Situ Cemented Tailings Backfill |
| title_sort | experimental study on factors influencing the strength distribution of in situ cemented tailings backfill |
| topic | backfill slurry strength of cemented backfill inhomogeneity of cemented backfill cemented tailings backfill |
| url | https://www.mdpi.com/2075-4701/11/12/2059 |
| work_keys_str_mv | AT xiaopengpeng experimentalstudyonfactorsinfluencingthestrengthdistributionofinsitucementedtailingsbackfill AT lijieguo experimentalstudyonfactorsinfluencingthestrengthdistributionofinsitucementedtailingsbackfill AT guangshengliu experimentalstudyonfactorsinfluencingthestrengthdistributionofinsitucementedtailingsbackfill AT xiaocongyang experimentalstudyonfactorsinfluencingthestrengthdistributionofinsitucementedtailingsbackfill AT xinzhengchen experimentalstudyonfactorsinfluencingthestrengthdistributionofinsitucementedtailingsbackfill |