Study on Filling Material Ratio and Filling Effect: Taking Coarse Fly Ash and Coal Gangue as the Main Filling Component

Abstract

Filling mining is an effective way to settle the dilemma of “Three Down and One Above” in coal mining. Fly ash and coal gangue can be used as filling materials with significant social, economic, and environmental benefits. Using coarse fly ash base as cementing material and coal gangue as aggregate, orthogonal experiment of filling paste was conducted in this study. The range analysis was performed for the strength and transportation requirements of filling paste, and the optimum proportion was determined by the comprehensive balance method. In order to verify the filling effect, a dynamic filling simulation device was designed, and a comparative simulation test of caving mining and dynamic filling mining was carried out. Results show that the filling paste with fly ash and coal gangue as the main component can meet the requirements of filling design and application. This research provides a reference for the material selection and proportion design of paste filling.

Modeling study on the influence of the strip filling mining sequence on mining‐induced failure

“…Combined with the advantages of the filling method and the strip method, strip filling mining can control surface subsidence well. [13][14][15][16] The demand for filling materials in strip filling mining is low, which can greatly reduce the filling cost. At the same time, strip filling mining has overcome the shortcomings of a low coal mining rate, with more than 90% of coal accounted for.…”

Raw Gangue Filling Mining under Construction <br/>—A Case Study in China

“…These indexes can be divided into two kinds: one is the external factors like stress, constraint condition, water, etc. [21]. The other is internal factors like strength, particle, shape, etc.…”

Experimental Study on Gangue Backfilling Materials Improved by Soda Residue and Field Measurement of Surface Subsidence

“…Backfilling material (Ma et al, 2019a) is the key to cemented backfilling, and the material cost accounts for more than 40% of the backfilling cost (Liu et al, 2021). The gangue-based cemented backfilling mainly composed of gangue and fly ash (solid waste) has been widely applied (Cui and Henghu, 2010;Wang et al, 2019;Ran et al, 2020). Studies on the performance of gangue-based cemented materials (including slump, diffusivity, rheological properties, setting time, compressive strength, shear strength, and material mix proportion) have been widely performed (Li et al, 2020b;Yin et al, 2020a;Yin et al, 2020b).…”