Deduction and modification of experimental similarity criteria for rheological model of soft rock under temperature

With the increasing of mining depth, the temperature has become one of the main factors influencing the deep mining engineering. As the surrounding rock of deep soft rock has the characteristics of strong rheology and large deformation under the complex environment of high temperature and high pressure, the key to the support is to master the rheological law. Based on the three laws of similarity, we briefly analysed the influence mechanism of temperature on the soft rock mechanical characteristics, and deduced in detail the similarity criteria which must be met by the geometric quantities and physical quantities of the prototype and the model in the rheological model test of soft rock under temperature, and then obtained the similarity relation which must be met among various physical quantities of the prototype and the model in the rheological model test of soft rock and enriched the application field of similarity criterion, which has important practical engineering value for support of deep soft rock engineering.