Multi-Factor Optimization of Adjacent Layered Salt Rock Storage Based on Response Surface Methodology

In order to improve the utilization efficiency of salt rock mines when storing natural gas, it is necessary to clarify the influence of different factors on adjacent underground laminated salt rock caverns. In view of this, 15 groups of simulation tests are designed by using the Response Surface Methodology (RSM). A quadratic response surface model with the midpoint displacement and cavern waist stress of the interlayer as the response values is constructed. The influence of the interaction between pillar width, interlayer thickness and the location of a single interlayer on the midpoint displacement of the interlayer and the internal waist stress of the adjacent ellipsoidal cavity is studied. The results show that the interlayer thickness is the main influence factor of the midpoint displacement of the interlayer, and the pillar width is the main influence factor of the cavern waist stress. When the adjacent storage is designed as a pillar width of 2.5D, an interlayer thickness of 2 m, and the midpoint of the interlayer is 0.3H above the cavity, the displacement and stress of the test model are relatively small. The results can provide a certain reference for the mechanical analysis of adjacent underground layered salt rock gas storage. © 2023 Union of Chambers of Engineers and Architects of Turkey. All rights reserved.