Theoretical Analysis Of Effect Of Void Pressureon Creep Of Deep Rock

With the development of coal mining's depth, the rock is under the actions of high ground stress, high temperature and high void pressure, In the course of time, the phenomena of creep will happen, the problems about tunnel progressing, supporting and maintaining are more and more outstanding. Void pressure, as an important external condition, should not be ignored in the research of creep. In this paper, the research progresses through three aspects. First, the creep equation and relaxation equation of the modified Xi Yuan model under alternating stress are derived. Second, the creep model of porous medium is established in which groundwater seepage and void pressure are taken into account and surrounding rock is regarded as porous medium. Acording to the model, the creep of underground tunnel is analyzed. Furthermore, the creeps of rock under different void pressures are simulated using ANSYS programs. Third, the mathematical model describing the nonlinear creep phenomena of solid-fluid coupling of one-phase fluids in saturated porous medium is established.