Author:
Ai Chunming,Yu Anju,Liu Chao,Li Tao
Abstract
AbstractThe stratified structural plane caused by stratified backfill will reduce the strength of backfill, and the introduction of retarder will make up for the defect. Three retarders, sodium tripoly-phosphate, citric acid and sucrose, were introduced. After determining the optimal dosage of retarder, they were added into the filling slurry with a ratio of lime to sand of 1:6 and a mass concentration of 75%. Based on the hydration reaction mechanism and damage mechanics theory of cement, the setting time test and uniaxial compressive strength test were carried out. With the help of scanning electron microscopy and X-ray diffraction, the influence mechanism of retarder on the physical characteristics of stratified cemented filling was investigated.The main research contents and achievements are as follows:. The results showed that the three retarding agents can delay the setting time of the cement filling slurry, and the retarding effect is sucrose > citric acid > sodium tripolyphosphate. The addition of retarder can improve the uniaxial compressive strength and integrity of stratified consolidated backfill, and the best filling interval time (FIT) is 12 h. Appropriate addition of retarder will increase the amount of cement hydration products, make the structure of hydration products more dense, reduce the formation of stratified structural plane, and help to improve the strength of stratified cemented backfill.
Funder
The Natural Science Foundation Program of Liaoning Province
Publisher
Springer Science and Business Media LLC
Reference24 articles.
1. Li, L., Aubertin, M. & Belem, T. Formulation of a three dimensional analytical solution to evaluate stresse val time s in backfilled vertical narrow openings. Can. Geotech. J. 42, 1705–1717 (2005).
2. Wu, A. X. et al. Status and prospects of paste technology in China. Chin. J. Eng. 40(5), 517–525 (2018).
3. Wang, P. et al. Stability analysis of backfilling in subsiding area and optimization of the stoping sequence. J. Rock Mech. Geotech. Eng. 5, 478–485 (2013).
4. Wu, A. X. et al. Status and prospects of researches on rheology of paste backfill using unclassified-tailings (Part 1): Concepts, characteristics and models. Chin. J. Eng. 42, 803–813 (2020).
5. Cao, S. et al. Mechanical model analysis of consolidated filling pillar using stage-delayed backfill in metal mines. Rock Soil Mech. 36, 2370–2376 (2015).