针对静动载联合作用下巷道底板突水问题，结合工程实例采用数值模拟软件FLAC^3D构建模型，从应力场、位移场及破坏区共同耦合作用角度出发，分析了动静载叠加作用下的底板突水通道形成过程及作用机制，探讨了关键致灾因素对巷道底板突水的作用程度。研究结果表明：静载与动载应力场叠加，导致底板应力集中程度和范围在深度方向扩大；巷道底板受动载作用后破坏深度和范围加大，有效隔水层厚度减少，底板突水的风险性增加；巷道底板突水通道的形成主要与动载幅值、持时及承压水水压有关，其中动载幅值对突水作用程度较大，当动载幅值超过临界值时，巷道底板破坏深度显著增加；持时的增大使得动载作用的时间特征减弱，更加接近于静载作用，巷道底板发生拉伸破坏的可能性降低；承压水水压的增大，使得作用在巷道底板下岩层的有效应力减小，岩体强度降低，底板破坏深度增加。采用单因素分析法对比发现，各致灾因素对底板突水的影响程度依次为：动载幅值>动载持时>承压水水压。

In response to the problem of water inrush from the floor of a roadway under the combined action of static and dynamic loads, a numerical simulation software FLAC^3D was used to construct a model based on engineering examples. From the perspective of the coupling effect of stress field, displacement field, and failure zone, the formation process and mechanism of water inrush channels from the floor under the combined action of dynamic and static loads were analyzed, and the degree to which key disaster causing factors affect water inrush from the floor of the roadway was explored. The research results indicate that the superposition of static and dynamic stress fields leads to an increase in the concentration and range of bottom plate stress in the depth direction. The dynamic load effect will increase the damage range and depth of the tunnel floor, reduce the thickness of the effective waterproof layer, and thus increase the risk of water inrush from the floor. The formation of water inrush channels on the roadway floor is mainly related to the amplitude of dynamic load, duration, and pressurized water pressure. Among them, the amplitude of dynamic load has a greater impact on the degree of water inrush. When the amplitude of dynamic load exceeds the critical value, the depth of damage to the roadway floor significantly increases. The increase in duration weakens the time characteristics of dynamic load action and is closer to static load action, reducing the possibility of tensile failure of the tunnel floor. The increase of pressurized water pressure reduces the effective stress acting on the rock layer under the roadway floor, reduces the strength of the rock mass, and increases the depth of floor failure. By using the single factor analysis method, it was found that the degree of influence of each disaster causing factor on water inrush from the bottom plate is in the following order: dynamic load amplitude > dynamic load duration > pressurized water pressure.