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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摘要为研究矿井水对膏体充填体稳定性影响，制备浓度为0%，5%，10%和15%氯盐溶液，进行4，8，12和16次为期112 d的氯盐干湿循环试验，结合分形维数、XPS光谱及SEM监测系统分析氯盐侵蚀后膏体充填体宏–微观特征，揭示氯盐作用下膏体充填体劣化机制。结果表明：(1) 膏体充填体质量随氯盐干湿循环次数增加依次经历激增期、缓增期和下降期，溶液浓度增大会加剧试样质量变化。无氯盐和浓度为5%，10%，15%氯盐溶液中试样经历16次干湿循环后的质量变化率分别达到0.26%，0.79%，1.05%，2.15%。(2) 氯盐作用下膏体充填体抗压强度呈先增大后减小的变化规律，适度氯盐侵蚀有利于优化试样承载强度，过度氯盐侵蚀会严重弱化试样承载性能。浓度为5%，10%和15%氯盐溶液中试样经历4次干湿循环后的强度较原始强度增加了19.07%，17.57%，14.29%，经历16次干湿循环后的强度较原始强度下降了1.21%，19.81%，25.7%。(3) 氯盐溶液中膏体充填体的损伤变形以小尺度裂隙发育为主，氯盐侵蚀能够明显改变膏体充填体分形维数的时间序列和前兆信息。无氯盐溶液中试样声发射分形维数呈“W”型，氯盐溶液中试样分形维数呈“M”型。(4) Friedel?s盐生成是膏体充填体劣化的根本原因，该晶体的结构特性是氯盐作用下膏体充填体承力性能异化的直接驱动机制。氯盐与试样内部组分的化学结合会抑制界面过渡区水化产物的生成和积聚，致使膏体充填体胶结能力下降。盐蚀产物的充实胀力会抵抗试样内部应力，导致膏体充填体压密及损伤变形性能异化。研究对维持膏体充填体长期稳定具有重要意义，为矿井水环境中膏体充填体的破坏失稳提供理论依据。

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	杜兆文
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关键词 ：采矿工程, 膏体充填体, 氯盐干湿循环, 分形维数, Friedel?s盐, 劣化机制

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

引用本文:

杜兆文，温卓越，李帅乾，王飞宇. 氯盐作用下膏体充填体力学特性及劣化机制研究[J]. 岩石力学与工程学报, 2024, 43(12): 2924-2939.
DU Zhaowen，WEN Zhuoyue，LI Shuaiqian，WANG Feiyu. Study on the mechanical properties and degradation mechanism of backfill br paste under the action of chloride salts. , 2024, 43(12): 2924-2939.

链接本文:

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

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