Experimental Study on the Optimization of Coal-Based Solid Waste Filling Slurry Ratio Based on the Response Surface Method

Abstract

The large production and low comprehensive utilization rate of solid waste from coal power base affects the efficient and coordinated development of regional resources and the ecological environment. In order to promote utilization of solid waste from coal power base, coal gangue, fly ash, and gasification slag are mixed as raw materials to prepare filling materials, and a study on the evolution law of the mechanical properties of coal-based solid waste filling body is systematically carried out. After clarifying the physical and chemical properties of the filling materials, the Box–Behnken experimental design method was used to study the effects of slurry mass fraction, coal gangue, fly ash, and gasification slag on the strength of the filling body based on the response surface-satisfaction function coupling theory. Furthermore, a multivariate nonlinear regression model was constructed for the strength of the filling body at different maintenance ages. Based on the analysis of variance (ANOVA) and the response surface function, the impact mechanism of influencing factors and their interaction on the strength of filler were revealed. The results show that the strength of the filler is affected by single factors and interactions between factors. The interaction of slurry mass fraction and gangue dosing has a significant effect on the strength of the filler in the early stage; the interaction of fly ash and gangue dosing has a significant effect on the strength of the filler in the middle stage; the interaction of slurry mass fraction and gasification slag dosing has a significant effect on the strength of the filler in the final stage. The mixed filling materials significantly affect the strength of the filler as the maintenance time is extended. The mixed filling materials are extensively interlaced with the hydration products, calcium alumina, and calcium silicate hydrate (C-S-H) gel, forming a stable three-dimensional spatial support system as the maintenance time increases. The best ratio to meet the requirements of mine filling slurry pipeline transportation and filling body strength was selected using the regression model and the proposed economic function of filling material.

Optimization of Controlled Low-Strength Material from Multi-Component Coal-Based Solid Waste

“…The first is factor A (cement-binder ratio), whose flowability belongs to the category of high flowability, and bleeding is at the edge of 5%. A is the main factor affecting the compressive strength, so level 2 (0.24) should be selected according to the compressive strength level (the compressive strength of 28 d should be greater than 3 MPa and less than 8.3 MPa) [43].…”

Study on Performance Optimization of Water-Rich Grouting Materials Based on Response Surface Methodology

“…The interfacial transition zone (ITZ) is an important component of the concretion, characterized by low strength and low modulus of elasticity, which affects compressive strength and permeability [39,40]. The transition zone at the grouting materials and injected coal interface exhibits differences because of the difference in the PC and RW grouting materials.…”

Development and performance optimization of a new composite sealing material prepared by drilling cuttings

“…In addition, under the negative pressure of gas extraction and coal mining, if the strength of the sealing material is too low, secondary cracks will occur, making it difficult to seal the gas leakage channel (Zhu et al, 2021;Jing et al, 2022). Therefore, the sealing material needs to have a certain early strength to achieve timely support for the borehole, thus preventing the occurrence of unstable deformation during drilling that results in the formation of air leakage rings (Guo et al, 2022;Wei et al, 2022).…”