Coal seam water injection is a critical measure for the prevention of coal-and-gas outbursts. However, the gas–solid–liquid coupling effect in front of the working face before and after water injection during coal mining is scarcely investigated. This issue was explored in this study by (a) numerical simulation of stress, gas pressure, and water saturability distribution as well as their coupling effect in front of the working face via the proposed multi-field coupling model run in the COMSOL software and (b) comparative analysis of the above parameters before and after water injection. During coal mining, stress in front of the working face first increased and then dropped to the initial value as the distance from the coal wall increased, while gas pressure exhibited a similar distribution pattern. After water injection, the stress distribution pattern remained almost unchanged, but the stress peak shifted forward, the stress relief zone broadened, while the gas pressure around the borehole dropped. In particular, the gas pressure in front of the borehole increased slightly at the beginning of water injection. As water was permanently injected, the gas pressure in front of the borehole decreased, while that around the borehole further decreased. Meanwhile, the water saturability of the coal seam around each borehole increased, with a ring-shaped distribution pattern. Due to the interaction of water injection among multiple boreholes, the contour lines of water saturability showed semi-circular distribution patterns around multiple boreholes.

煤层注水是防止煤与瓦斯突出的关键措施。但是，很少研究煤矿开采过程中注水前后工作面前的气固固耦合效应。通过（a）通过在COMSOL软件中运行的拟议多场耦合模型对应力，气压和水饱和度分布及其在工作面前的耦合效应进行数值模拟，探索了这个问题。 b）注水前后上述参数的比较分析。在采煤过程中，随着距煤壁距离的增加，工作面前的应力先增大然后减小到初始值，而瓦斯压力表现出相似的分布规律。注水后 应力分布模式几乎保持不变，但应力峰值向前移动，应力释放区域扩大，而井眼周围的气压下降。特别地，在注水开始时，井眼前方的气压略有增加。随着水的永久注入，井眼前方的气压降低，而井眼周围的气压进一步降低。同时，每个井眼周围的煤层的水饱和度以环形分布模式增加。由于多个井眼之间注水的相互作用，水饱和度等高线显示了多个井眼周围的半圆形分布模式。而井眼周围的气压下降了。特别地，在注水开始时，井眼前方的气压略有增加。随着水的永久注入，井眼前方的气压降低，而井眼周围的气压进一步降低。同时，每个井眼周围的煤层的水饱和度以环形分布模式增加。由于多个井眼之间注水的相互作用，水饱和度等高线显示了多个井眼周围的半圆形分布模式。而井眼周围的气压下降了。特别地，在注水开始时，井眼前方的气压略有增加。随着水的永久注入，井眼前方的气压降低，而井眼周围的气压进一步降低。同时，每个井眼周围的煤层的水饱和度以环形分布模式增加。由于多个井眼之间注水的相互作用，水饱和度等高线显示了多个井眼周围的半圆形分布模式。而井眼周围的进一步减少。同时，每个井眼周围的煤层的水饱和度以环形分布模式增加。由于多个井眼之间注水的相互作用，水饱和度等高线显示了多个井眼周围的半圆形分布模式。而井眼周围的进一步减少。同时，每个井眼周围的煤层的水饱和度以环形分布模式增加。由于多个井眼之间注水的相互作用，水饱和度等高线显示了多个井眼周围的半圆形分布模式。