Abstract
Controlling the cavity structure is one of the key topics during the operation and maintenance of salt cavern. Water jet has been widely utilized in the field of underground engineering, and is also feasible in salt cavern irregular shape. In this paper, experiments were conducted to investigate the erosion characteristics of salt rock under water jet impact and dissolution. The erosion mass loss under different jet parameters was firstly analyzed and the difference between pure water and saturated brine jet erosion was compared. Subsequently, a set of parameters was selected to investigate the effect of jet brine concentration on the erosion performance by morphological description, dimensional measurement, penetration rate and unit energy consumption. It is indicated that the erosion efficiency of low-pressure jet for salt rock is 10 times higher than that of indoor dissolution methods, in which dissolution is dominant, and increasing the flow rate and nozzle diameter can effectively improve the erosion performance. Under experimental conditions, the crack damage formed due to impact action can affect the dissolution contact area, and the presence of a critical concentration varies the erosion efficiency by up to 50 %. This study helps to deepen the understanding of jet erosion patterns of salt rocks and provides valuable information for water jets in the irregular structure modification.
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