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International Journal of Frontiers in Engineering Technology, 2023, 5(1); doi: 10.25236/IJFET.2023.050108.

Study on in-road filling without coal pillar mining technology and its material proportioning optimization


Di Wu

Corresponding Author:
Di Wu

College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao, Shandong, 266590, China


In order to solve the problems of low extraction rate of coal resources and pollution of mine gangue solid waste, based on the in-road paste filling without coal pillar mining technology, a coal mine in Shandong underground working face transport road as the research object, through theoretical analysis to determine the in-road filling body parameters, in order to explore the excellent load-bearing performance, low cost of filling gangue paste in-road filling material, combined with laboratory tests on the paste filling material ratio and mechanical properties for Ratio optimization study, the optimal filling material ratio of cement: fly ash: coal gangue = 1:2:5, mass concentration of 78%, early strength agent admixture of 1.6%. Under the condition of this ratio, the early strength of the filling specimen can reach 2MPa, and the late strength can reach 14MPa, and the specimen still has high residual strength after compression damage, and the support resistance is considerable and the bearing performance is good.


No pillar mining; Paste filling in roadway; Ratio optimization; Orthogonal test

Cite This Paper

Di Wu. Study on in-road filling without coal pillar mining technology and its material proportioning optimization. International Journal of Frontiers in Engineering Technology (2023), Vol. 5, Issue 1: 48-56. https://doi.org/10.25236/IJFET.2023.050108.


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