氯盐作用下膏体充填体力学特性及劣化机制研究

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Abstract In order to study the influence of mine water on the stability of backfill paste，chloride salt solutions with concentrations of 0%，5%，10% and 15% were prepared，and 4，8，12 and 16 times of chloride salt dry-wet cycle tests for 112 days were carried out. Combined with fractal dimension，XPS spectrum and SEM monitoring system，the macro-micro characteristics of backfill paste after chloride salt erosion were analyzed，and the deterioration mechanism of backfill paste under the action of chloride salt was revealed. The results show that：(1) The mass of the backfill paste experiences a surge period，a slow increase period and a decline period with the number of chloride salt dry-wet cycles，and the increase of solution concentration will aggravate the change of the sample mass. The mass change rates of the samples in chloride-free and chloride salt solutions with concentrations of 5%，10%，15% after 16 dry-wet cycles reach 0.26%，0.79%，1.05%，and 2.15%. (2) Under the action of chloride salt，the compressive strength of backfill paste increases first and then decreases. Moderate chloride salt erosion is beneficial to optimize the bearing strength of the sample，and excessive chloride salt erosion will seriously weaken the bearing performance of the sample. The strength of the sample in 5%，10% and 15% chloride salt solution after 4 dry-wet cycles increases by 19.07%，17.57% and 14.29% compared with the original strength，and the strength after 16 dry-wet cycles decreases by 1.21%，19.81% and 25.7% compared with the original strength. (3) The damage and deformation of backfill paste in chloride salt solution are dominated by small-scale fracture development. Chloride salt erosion can significantly change the time series and precursor information of fractal dimension of backfill paste. The fractal dimension of the sample in the chloride-free salt solution is“W”type，and the fractal dimension of the sample in the chloride salt solution is“M”type. (4) The formation of Friedel's salt is the root cause of the deterioration of the backfill paste，and the structural characteristics of Friedel's salt are the direct driving mechanism of the alienation of the bearing performance of the backfill paste under the action of chloride salt. The chemical bonding between chloride salt and the internal components of the sample will inhibit the formation and accumulation of hydration products in the interfacial transition zone，resulting in a decrease in the cementation ability of the backfill paste. The crystalline swelling force of salt corrosion products will resist the internal stress of the sample，resulting in the alienation of the compaction and damage deformation properties of the backfill paste. This study is of great significance for maintaining the long-term stability of backfill paste，and provides a theoretical basis for the failure and instability of backfill paste in mine water environment.

Key words： mining engineering backfill paste chlorine salt dry wet cycle fractal dimension Friedel?s salt deterioration mechanism

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	Articles by authors
	DU Zhaowen
	WEN Zhuoyue
	LI Shuaiqian
	WANG Feiyu

Cite this article:

DU Zhaowen,WEN Zhuoyue,LI Shuaiqian, et al. Study on the mechanical properties and degradation mechanism of backfill br paste under the action of chloride salts[J]. , 2024, 43(12): 2924-2939.

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https://rockmech.whrsm.ac.cn/EN/Y2024/V43/I12/2924

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