Geomechanical model test of underground caverns in salt rock

The world's increasing demand for natural gas has made the research on the temporal evolution of storage group damage and the corresponding protection theory of great significance. At present, researches on the overall stability and temporal evolution of underground caverns are relatively few. Relating experimental study has not been reported yet. This paper simulated the injection-production cycles of 4-cavern reservoir group under different internal pressure with small block masonry. The variation of the displacement and strain of the bedrock and the cavern group is automatically recorded by the displacement meters and the strain gauges buried in the model. Cavern stability under different gas production process, the failure pressure of the caverns and the impact of mudstone interlayer on cavern stability are analyzed.