一种盐岩相似材料的试验研究

目前国内外学者主要利用小尺寸盐岩试件进行盐岩造腔理论以及溶腔稳定性方面的研究，所以利用相似材料制备大尺寸型盐模拟盐岩造腔全过程，以及研究溶腔的稳定性是有必要的。利用盐屑在高压下制备成型盐，测试其溶解特性和力学特性。试验表明压制应力为40、60、80 MPa时制成的型盐，其溶解速率变化不大；在压制型盐与天然岩盐的倾角溶解试验中发现，倾角为0°、90°、180°时溶解速率分别是天然盐岩的2.15倍、1.84倍、1.77倍；型盐的单轴抗压强度同压制的应力成正比，压制应力为80 MPa时干燥型盐同天然盐岩强度相当；型盐吸水后强度有所降低，而天然盐岩吸水后强度没有明显变化。所以在适当压制力作用下，利用盐屑压制型盐代替盐岩用于造腔理论及造腔全过程试验和溶腔稳定性试验研究是可行的。

Experimental research on a similitude material of rock salt

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.