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To reveal the damage and degradation mechanisms of mudstone in tailings reservoir slopes under complex environmental conditions, dynamic uniaxial compression tests, CT scanning, and scanning electron microscopy(SEM)were conducted to analyze the evolution of dynamic uniaxial compressive strength and structural damage mechanisms of mudstone under three typical environmental conditions, i.e., wet-dry cycles, freeze-thaw cycles, as well as wet-dry and freeze-thaw cycles. The results show that the dynamic compressive strength and dynamic elastic modulus of strongly weathered mudstone continuously decay with the increase of cycle number, and the deterioration rate gradually stabilizes after 80 cycles. Among those three environmental damage conditions, the coupling effect of wet-dry and freeze-thaw cycles brings the most significant deterioration to mudstone. After 100 wet-dry and freeze-thaw cycles, the dynamic compressive strength and dynamic elastic modulus of mudstone decrease, and the connectivity of pore networks increases remarkably, presenting a strong linear relationship (negative correlation) between porosity and dynamic compressive strength. Complex environments can reduce the effective bearing area and stress transfer efficiency of rock mass by accelerating pore expansion and crack propagation, thus eventually lead to structural damage and strength deterioration of mudstone. Relevant suggestions for slope reinforcement engineering of tailings reservoirs are finally put forward based on the research results.
, authors=Ping LIU
1, Junfeng ZHANG
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为揭示尾矿库边坡泥岩在复杂环境作用下的损伤劣化机制,开展了动态单轴压缩试验、CT扫描及扫描电镜等试验,分析了干湿循环、冻融循环及干湿-冻融循环3种典型环境条件下泥岩的动态抗压强度演化与结构损伤机制。结果表明,强风化泥岩的动态抗压强度与动弹性模量随循环次数增加呈持续衰减特征,且劣化速率在80次循环后逐渐趋于稳定;在3种环境损伤效应中,干湿-冻融循环对泥岩的劣化影响最显著,经过100次干湿-冻融循环后,泥岩的动态抗压强度和动弹性模量均下降,孔隙网络连通度显著增加,孔隙率与动态抗压强度呈强负线性相关关系。复杂环境通过加速孔隙膨胀与裂隙扩张,降低了岩体的有效承载面积与应力传递效率,最终引发泥岩的结构损伤与强度劣化。根据研究结果,对尾矿库边坡加固工程提出了相关建议。
, authors=刘萍
1, 张军锋
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