Abstract:

At present, when studying the theory of solution mining as well as the stability of solution chamber, the main method, adopted by domestic and foreign scholars, is based on exploitation of small-size rock salt simple. Therefore, it is necessary to create large-size rock salt with similitude materials to faciliate simulation of the entire process of solution mining, and of the stability of solution chamber. Specific tests have been carried out on dissolution property and mechanical property of molded rock salt, which is made up of salt powder with high pressure treatment. The experiment indicated that the rate of dissolution kept steady when the suppressing-stress are 40 MPa, 60 MPa and 80 MPa, while the ratio of molded rock salt are 2.15 times, 1.84 times and 1.77 times as quick as that of natural rock salt whilst the angle is 0°, 90°and 180°respectively. The conclusions are drawn that the strength of molded rock salt is proportional to the suppressing-stress and the strength of dry-molded rock salt corresponding with that of rock salt when the suppressing-stress is 80 MPa; the strength of molded rock salt decreases after water uptake while that of rock salt is lack of change. Therefore, under the effect of proper suppressing-stress, it is justifiable to reach the conclusion that it is practicable to substitude rock salt with molded rock salt stressed by salt power in entire-process test running and theory study of solution mining, as well as experiment study of the stability of solution chamber.

Key words: rock salt, molded rock salt, dissolving velocity