Fluid-solid coupling analysis of safety of waterproof gate

A FLAC-3D fluid-solid numerical simulation was performed to analyze the stability and anti-water ability of the waterproof gate. Analysis indicates that under water pressure 10.3MPa, the structure of underground chamber of waterproof gate and surrounding rock mass are under plastic state partially, but are basically stable and usable. In case of water filling in the tunnel, water seepage amount is closely related to and directly proportional to water pressure. Most of the seepage spread to the surrounding rock, with only a little seeping into the underground chamber and the tunnel. Due to large seepage amount in the longer water-filled tunnel and the limited capacity of high-pressure pump, it is almost impossible to realize 10.3MPa water injection test though the waterproof gate can meet utilization requirements, which fully proves the necessity of performing numerical simulation. The result shows that the FLAC-3D based fluid-solid coupling analysis on waterproof gate is more practical and effective, which provides a reliable analysis method with a very good application prospect.