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Abstract The mechanical property of rock salt similar model is derived from the similarity theory in order to obtain the similarity criteria of the mechanical parameters. Considering the four factors，i.e. pressing strength，water ratio，salt particles with different diameters and insoluble in salt，Chongqing Beibei salt mine is chosen to make a materials proportion test. The results show that Chongqing Beibei salt filtered into 16 mesh size without gypsum powder when putting it in the 105 ℃–110 ℃ oven for 24-hour drying，under 100 MPa pressing strength while keeping the pressure for 30 minutes，then the synthetic rock salt that can meet the requirement of uniaxial mechanical similar model of Jintan rock salt was produced. This study makes a research on the dissolution characteristics of synthetic rock salt produced by the best materials proportion whilst dissolve angle is 90° and 180° in regular temperature as well as in 60 ℃，70 ℃ and 80 ℃. The results show that the dissolution rate of molded rock salt was 0.75 times as quick as that of natural rock salt when the angle was 90º and remains 0.81 times under 180° angels in regular temperature. What?s more，the dissolution rate of molded rock salt was 0.88，0.74 and 0.78 times as quick as that of natural rock salt whilst temperature was 60 ℃，70 ℃ and 80 ℃ respectively. The similar material proportion can be used for the making of large-size synthetic rock salt to simulate the rock salt cavity formation process，thus it has an important effect on the cavity simulation study.
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Received: 27 April 2012
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2012, Vol. 31 
