地下固体钾盐矿固液尾废复合胶结体力学特性试验研究

doi:10.3724/1000-6915.jrme.2025.0734

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Abstract A composite cemented backfill system incorporating magnesia, fly ash, and tailings was developed to address the challenge of low-cost utilization of solid-liquid waste generated from underground Sylvinite mining. An orthogonal experimental design with three factors at three levels was employed, focusing on binder content, the mass ratio of brine to tailings, and fly ash content. A series of tests were conducted on the cemented specimens, including uniaxial compression tests, acoustic emission monitoring (AE), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The variations in compressive strength and elastic modulus of specimens at different factor levels were investigated. An optimal formulation of the composite cemented material was established. The energy dissipation characteristics during various loading stages were analyzed, and the micromorphology of hydration products within the specimens was examined to elucidate the composite cementation mechanism of the solid-liquid tailings. Additionally, the contribution weights of different factors to the damage variable were quantified, leading to the establishment of a damage constitutive model for the magnesia-fly ash-tailings composite under varying factors and levels. The results demonstrate that the optimal specimen, with a binder content ratio of 1:5, a brine-to-tailings ratio of 1:5, and a fly ash content of 25%, achieves a peak compressive strength of 4.51 MPa. The brine-to-tailings ratio was identified as the primary factor influencing mechanical properties. The failure mode was governed by the fly ash content, transitioning from tensile splitting to shear failure while exhibiting significant plastic residual deformation as the fly ash content increased. The AE activity exhibited three distinct stages: initial quietness, rapid growth, and post-peak quietness. Higher levels of binder and fly ash content, combined with a lower brine-to-tailings ratio, enhanced the energy release per AE event, as well as both the cumulative event count and the total cumulative AE energy. These changes significantly accelerated micro-crack development and improved the connectivity of macroscopic fractures. Based on cumulative AE energy and factor contribution weights, a segmented damage constitutive model for the composite backfill was developed. The theoretical calculations from this model closely matched the experimental data, effectively capturing the stress-strain relationships and damage evolution processes across specimens with different mix proportions. This study provides a foundation for the development of cemented backfill technology utilizing solid-liquid tailings from underground potash mines.

Key words： engineering solid potassium salt cementitious material mechanical properties acoustic emission characteristics constitutive model

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	WANG Qizhou1
	2
	3*
	LI Yang3
	HUANG Yushu3
	CHI Xiuwen1
	2
	3
	REN Gaofeng1
	2
	3
	ZHENG Bokun4
	5
	SHI Yong4
	5

Cite this article:

WANG Qizhou1,2,3*, et al. Mechanical properties of solid-liquid tailings composite cemented body in underground solid sylvinite mines[J]. , 2026, 45(9): 2635-2648.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2025.0734 OR https://rockmech.whrsm.ac.cn/EN/Y2026/V45/I9/2635

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