The Analysis Of Creep Law In Rock Under Pore Pressure

With the development of coal mining, the rock is always under complicated geologic environment, In the course of time, the phenomena of creep will happen, the problems about tunnel progressing, supporting and maintaining are more and more outstanding.Pore pressure, as an important external condition, should not be ignored in the research of creep. In the paper, the research progresses through three aspects. First, the creep equation and relaxation equation of the modified Burgers model of classical mechanics under alternating stress are derived. Second, the creep model of porous medium is established in which groundwater seepage and Pore 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 pore pressures are simulated using FLAC programs. Third, the mathematical model describing the nonlinear creep phenomena of solid-fluid coupling of one-phase fluids in saturated porous medium is established.