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为探讨济北矿区深部下组煤底板岩石与水相互作用规律,以岱庄煤矿首采面底板5种不同类型岩性的岩样为研究对象,在自来水与饱和食盐水浸泡后并结合自然浸泡与湿–干交替循环浸泡条件下两两组合进行为期52 d的水稳性和相关电导率试验。研究结果表明:(1)根据20个岩样掉渣、表面裂隙、岩样开裂、饱水后强度和崩解等现象统计对比分析,发现不论是自来水还是饱和食盐水在自然浸泡条件下5种岩样的水稳性均相对较好,浸水后基本不崩解,但在湿–干交替循环作用条件下均会发生崩解现象;(2)通过对自来水浸泡岩样在自然与湿–干交替条件下电导率测试,发现所有岩样溶液中电导率增加幅度随时间均表现出比较明显的3个阶段,但同一岩样在不同条件下电导率增加幅度随时间变化具有较大差异性,湿–干交替岩样的电导率增加幅度明显大于自然浸泡岩样的;(3)电导率和岩样质量损失率基本呈正相关关系。研究结果对深部水岩相互作用导致岩石劣化的微观机制研究提供参考。
In order to explore the law of interaction between rock and water of the lower coal seam floor in the deep mining area of Jibei coal mine, five rock samples of different types of lithology in the first coal mining face of Daizhuang coal mine were taken as research objects. After soaking in tap water and saturated brine and combining with natural soaking And wet-dry alternating cycles under immersion conditions for any combination of 52-day water stability and related conductivity tests. The results show that: (1) Based on statistic analysis of 20 samples of slag removal, surface fissure, rock cracking, strength after saturation and disintegration, it is found that no matter tap water or saturated salt water is under natural soaking conditions The water stability of the rock samples is relatively good, and does not disintegrate basically after soaking in water but disintegration occurs under the wet-dry alternation cycle. (2) Conductivity tests under alternating conditions showed that the increase of conductivity in all samples shows obvious three phases with time. However, the increase of conductivity in different rock samples under different conditions shows a great difference with time. The conductivity increase rate of wet-dry alternate rock samples is obviously larger than that of natural soaked rock samples. (3) There is a positive correlation between conductivity and rock mass loss rate. The results provide references for the micro-mechanism of rock degradation induced by deep water-rock interaction.