Prediction of water inflow after excavation of underground chamber group with long span and high buried depth

Predict the water inflow after excavation of large underground caverns is crucial for the safe construction and operation of underground engineering. To predict the water inflow of underground caverns after excavation and provide guidance for drainage and anti-seepage design, this study focused on the large underground powerhouse caverns of a pumped storage power station in Xinjiang, and analyzed the seepage characteristics of rock mass in the dam site area in terms of groundwater activity characteristics, borehole water pressure test, and the development of structural planes in the rock mass. To enhance the reliability of the prediction results, the change of groundwater seepage field and normal water inflow after excavation of underground caverns are analyzed and predicted by groundwater dynamics method and numerical analysis method, respectively. The results show that significant seepage and drainage occur after the excavation of the underground caverns, with the main powerhouse bearing the majority of the