Centrifuge model studies on the stability of fibre-reinforced cemented paste backfill stopes

2018 ◽  
Vol 46 (4) ◽  
pp. 396-401 ◽  
Author(s):  
X.W. Yi ◽  
G.W. Ma ◽  
A. Fourie
Keyword(s):  
Cemented Paste Backfill ◽  
Centrifuge Model ◽  
Model Studies ◽  
Paste Backfill ◽  
The Stability

scholarly journals Fluidization Analysis of Thickening in the Deep Cone for Cemented Paste Backfill

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Haiyong Cheng ◽  
Jin Liu ◽  
Shunchuan Wu ◽  
Xiaoqiang Zhang
Keyword(s):  
Critical Velocity ◽  
Failure Time ◽  
Cemented Paste Backfill ◽  
Tailings Pond ◽  
Paste Backfill ◽  
Efficient Machine ◽  
The Stability ◽  
Deep Cone Thickener ◽  
The Relationship ◽  
The Ideal

Cemented paste backfill (CPB) can effectively eliminate the risk of dam break in goaf and tailings pond which used tailings waste. Deep cone thickener (DCT) is an efficient machine for the system of paste preparation, and the concentration of slurry at the bottom is high and distributed unevenly, which will cause too much partial resistance and failure of thickener. Focusing on the above problems, fluidization design was conducted by using the fluidization theory. The delivery law of flocs was analyzed, and the isobaric surface was obtained. The equation of pressure and critical velocity of the ideal fluidized bed was acquired by analyzing the relationship between pressure and critical velocity. Based on the characteristics of tailings and distribution of the bonding zone, the arrangement, number, and working mode of spray nozzles were reformed. It is verified that the failure time of thickener decreased from 14 hours to 1 hour and the range of concentration increased from 74%∼78% to 78%∼80%, which improved the stability and reliability of DCT. The depth thickening mechanism is obtained, and the thickening method has been improved which provides a theoretical basis for the effective preparation of paste.

scholarly journals Development of an Ensemble Intelligent Model for Assessing the Strength of Cemented Paste Backfill

2020 ◽  
Vol 2020 ◽  
pp. 1-6 ◽  
Author(s):  
Yuantian Sun ◽  
Guichen Li ◽  
Junfei Zhang ◽  
Junbo Sun ◽  
Jiahui Xu
Keyword(s):  
Mine Waste ◽  
Construction Materials ◽  
Sensitivity Study ◽  
Support Vector ◽  
Cemented Paste Backfill ◽  
Proposed Model ◽  
Highly Nonlinear ◽  
Paste Backfill ◽  
High Prediction ◽  
The Stability

Cemented paste backfill (CPB) is an eco-friendly composite containing mine waste or tailings and has been widely used as construction materials in underground stopes. In the field, the uniaxial compressive strength (UCS) of CPB is critical as it is closely related to the stability of stopes. Predicting the UCS of CPB using traditional mathematical models is far from being satisfactory due to the highly nonlinear relationships between the UCS and a large number of influencing variables. To solve this problem, this study uses a support vector machine (SVM) to predict the UCS of CPB. The hyperparameters of the SVM model are tuned using the beetle antennae search (BAS) algorithm; then, the model is called BSVM. The BSVM is then trained on a dataset collected from the experimental results. To explain the importance of each input variable on the UCS of CPB, the variable importance is obtained using a sensitivity study with the BSVM as the objective function. The results show that the proposed BSVM has high prediction accuracy on the test set with a high correlation coefficient (0.97) and low root-mean-square error (0.27 MPa). The proposed model can guide the design of CPB during mining.

Effects of temperatures and pH values on rheological properties of cemented paste backfill

2021 ◽  
Vol 28 (6) ◽  
pp. 1707-1723
Author(s):  
Qin-li Zhang ◽  
Yi-teng Li ◽  
Qiu-song Chen ◽  
Yi-kai Liu ◽  
Yan Feng ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Cemented Paste Backfill ◽  
Ph Values ◽  
Paste Backfill

Recycling flue gas desulfurisation gypsum and phosphogypsum for cemented paste backfill and its acid resistance

2021 ◽  
Vol 275 ◽  
pp. 122170
Author(s):  
Shiyu Zhang ◽  
Yingliang Zhao ◽  
Hangxing Ding ◽  
Jingping Qiu ◽  
Zhenbang Guo
Keyword(s):  
Flue Gas ◽  
Acid Resistance ◽  
Cemented Paste Backfill ◽  
Paste Backfill

scholarly journals Strengthening Behavior of Cemented Paste Backfill Using Alkali-Activated Slag Binders and Bottom Ash Based on the Response Surface Method

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 855
Author(s):  
Qi Sun ◽  
Xueda Wei ◽  
Tianlong Li ◽  
Lu Zhang
Keyword(s):  
Response Surface ◽  
Bottom Ash ◽  
Hydration Product ◽  
Cemented Paste Backfill ◽  
Alkali Activated Slag ◽  
Surface Method ◽  
Optimal Mix ◽  
Paste Backfill ◽  
Activated Slag ◽  
Alkali Activated

A new type of cemented paste backfill (CPB) was prepared by using the bottom ash (BA) from a thermal power plant as an aggregate, alkali-activated slag as a binder, and an air-entraining agent as an admixture. Based on the central composite design (CCD) response surface method, the mix ratio was optimized, and scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) was performed on the optimal mix ratio. ImageJ software was utilized to determine the porosity of the experimental samples at various curing ages. The results indicate that the optimal mix ratio of the aggregate-binder ratio is 3.28, the alkali dosage is 3%, the solid content is 67.44%, and the air-entraining agent dosage is 0.1%. As the curing age increases, the porosity of CPB gradually decreases. A calcium aluminosilicate hydrate (C-A-S-H) gel is the main hydration product of alkali-activated slag. At the beginning of the hydration reaction, the slag gradually dissolves, and the C-A-S-H product binds the BA together. At 14 d, complete calcium hydroxide (CH) crystals appeared in the hydration product. Finally, the degree of C-A-S-H crystallization increased further to form a dense structure.

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