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 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. Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Xiaopeng Peng [verfasserIn] Lijie Guo [verfasserIn] Guangsheng Liu [verfasserIn] Xiaocong Yang [verfasserIn] Xinzheng Chen [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2021

Schlagwörter:	backfill slurry strength of cemented backfill inhomogeneity of cemented backfill cemented tailings backfill

Übergeordnetes Werk:	In: Metals - MDPI AG, 2012, 11(2021), 12, p 2059
Übergeordnetes Werk:	volume:11 ; year:2021 ; number:12, p 2059

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3390/met11122059

Katalog-ID:	DOAJ074322990

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callnumber-first	T - Technology
author	Xiaopeng Peng
spellingShingle	Xiaopeng Peng misc TN1-997 misc backfill slurry misc strength of cemented backfill misc inhomogeneity of cemented backfill misc cemented tailings backfill misc Mining engineering. Metallurgy Experimental Study on Factors Influencing the Strength Distribution of In Situ Cemented Tailings Backfill
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topic_title	TN1-997 Experimental Study on Factors Influencing the Strength Distribution of In Situ Cemented Tailings Backfill backfill slurry strength of cemented backfill inhomogeneity of cemented backfill cemented tailings backfill
topic	misc TN1-997 misc backfill slurry misc strength of cemented backfill misc inhomogeneity of cemented backfill misc cemented tailings backfill misc Mining engineering. Metallurgy
topic_unstemmed	misc TN1-997 misc backfill slurry misc strength of cemented backfill misc inhomogeneity of cemented backfill misc cemented tailings backfill misc Mining engineering. Metallurgy
topic_browse	misc TN1-997 misc backfill slurry misc strength of cemented backfill misc inhomogeneity of cemented backfill misc cemented tailings backfill misc Mining engineering. Metallurgy
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title	Experimental Study on Factors Influencing the Strength Distribution of In Situ Cemented Tailings Backfill
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title_full	Experimental Study on Factors Influencing the Strength Distribution of In Situ Cemented Tailings Backfill
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title_sort	experimental study on factors influencing the strength distribution of in situ cemented tailings backfill
callnumber	TN1-997
title_auth	Experimental Study on Factors Influencing the Strength Distribution of In Situ Cemented Tailings Backfill
abstract	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.
abstractGer	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.
abstract_unstemmed	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.
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container_issue	12, p 2059
title_short	Experimental Study on Factors Influencing the Strength Distribution of In Situ Cemented Tailings Backfill
url	https://doi.org/10.3390/met11122059 https://doaj.org/article/65d66d04547740b7ace0d44a5f069d21 https://www.mdpi.com/2075-4701/11/12/2059 https://doaj.org/toc/2075-4701
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author2	Lijie Guo Guangsheng Liu Xiaocong Yang Xinzheng Chen
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Experimental Study on Factors Influencing the Strength Distribution of In Situ Cemented Tailings Backfill

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