In this paper, a series of uniaxial compression experiments were carried out on sandstone with varying water contents, and acoustic emission (AE) signals were synchronously collected in the experimental process. It reveals that water content has a significant effect on the mechanical behavior and AE signals of sandstone. As the water content increases, both the uniaxial compression strength and the elastic modulus decrease while the peak strain and energy dissipation increase. In the perspective of AE signals, both the peak and the cumulative AE energy drop with the water content, and an exponential empirical function was proposed to describe their relationships. Multi-fractal analyses of AE signals were also performed. The uniformity of signal distribution (∆a) and the difference between frequencies of largest and smallest signals (∆f) also decrease with the increase of water content. All these phenomena can be explained by the fact that more and more intergranular fractures occur at the higher water content condition. Moreover, a sudden increase of ∆a and a sudden decrease of ∆f in time series can be used as the precursor of rock destabilization and failure which have potential engineering application value.

本文对不同含水量的砂岩进行了一系列单轴压缩实验，并在实验过程中同步采集了声发射（AE）信号。结果表明，含水量对砂岩的力学行为和声发射信号有显着影响。随着含水量的增加，单轴压缩强度和弹性模量均降低，而峰值应变和能量耗散增加。从AE信号的角度来看，峰值和累积AE能量都随着含水量的增加而下降，并提出了一个指数经验函数来描述它们的关系。AE 信号的多重分形分析也进行了。信号分布的均匀性 (∆ a) 和最大和最小信号频率之间的差异 (Δ f ) 也随着含水量的增加而减小。所有这些现象都可以用在较高含水量条件下出现越来越多的晶间裂缝这一事实来解释。此外，Δ的突然增加一个和Δ的突然减小˚F按时间序列可以用作岩石不稳定和发生故障的前体，其具有潜在的工程应用价值。