Abstract
To study the strength and permeability characteristics of cemented tailings backfill with different cement–sand ratios and different waste rock contents, uniaxial compression strength test and permeability test were carried out respectively. The porosity of cemented tailings backfills after solidification was observed by scanning electron microscope. The effects of cement–sand ratio and waste rock content on the internal porosity and overall permeability of cemented tailings backfill were studied. The test results showed that the cement–sand ratio and waste rock content have certain effects on the strength and permeability of the backfill body. When the cement–sand ratio was fixed, the uniaxial compressive strength and permeability of the backfill body increased first and then decreased with the increase of waste rock content. When the waste rock content was 10%, the uniaxial compressive strength of the backfill body reached the maximum, and when the waste rock content was 30%, the permeability reached the maximum. Due to the increase of the area of waste rock particles in the cross-section, the area of gas passing rapidly decreased, resulting in the decrease of the permeability growth rate. When the waste stone content was fixed, with the decrease of cement–sand ratio, due to the decrease of cementitious materials, more micro-cracks were produced in the curing process of backfill body, resulting in the decrease of uniaxial compressive strength and the increase of permeability.
Highlights
Backfill mining is an important development direction for safe and green mining in China
2.3.5 Data Results Due to the length of the article, Table 1 shows the data of permeability test for waste rock content with a cement–sand ratio of 1:4
When waste rock particles were added to 40%, it was found that the permeability decreased at this time
Summary
Backfill mining is an important development direction for safe and green mining in China. Wang and Xu (2018) carried out constant head permeability test and variable head permeability test for filling materials with different cement–sand ratios and different cement–cement agents They studied cement–sand ratio, cement–cement composition, and permeability variation characteristics of filling slurry after gradually solidifying, and discussed the influence relationship between the permeability of backfill and the content of cementing material. Permeability characteristics of the backfill are aggregate composition, cement–sand ratio, and other factors; considering the impact of filling strength on the stability of feature, waste rock added to the aggregate particles can effectively improve the strength of backfill and better meet the needs of the filling (Fu et al, 2014; Ge et al, 2014; Lu et al, 2017), and the addition of waste rock particles has a certain influence on the infiltration characteristics of backfill. This article conducted gas permeability tests on cemented tailings backfill with different cement–sand ratios and different waste rock contents, and analyzed the influence of cement–sand ratios and waste rock contents on the permeability characteristics of backfill
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