Taking the project in China as background, established a physical model experimental platform to simulate the cavity construction using the similar theory.The influence of interlayer to the cavity construction was studied.It was found: when the interlayer exists, the flow field becomes more complex;and the brine distribution besides the interlayer will be changed.Thus the dissolution of salt rock besides the interlayer was affected which results the triangle insoluble inclination appearing on the top of the interlayer, making the cave building inefficient and being not conducive to the cave shape control.It is the key to make the interlayer reasonable collapse in cavity construction.
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