Research On The Effects Of Chemical Erosion On Creep Of Deep Soft Rock

The advance of underground excavation and national defence construction towards deep part brings a series of problems of deep rock mechanics. Then the problems of ground water chemical corrosion which plays an important role of the engineering security, have been putting in front of us, of which the effect is a great menace to production and security. Therefore, it has the important theory significance and the application value to study on creep of deep soft rock in the effect of chemical corrosion.Creep forms part of rheology and it's also themain reason of the largede formation. Accordingly if you want tostudy thel arger heologieal deformation,study the creep features first in soft rock engineering. Sandstone can be regarded as porous medium. Its porosity is dynamic. The calculation method of effective stress of porous medium is given in this paper. At the same time, a traditional model of porous medium is improved, and chemical corrosion as a factor is introduced. Taking the effect of PH value and effective stress into account, creep equations of deep sandstone are established under chemical corrosion.The models are veryfied through sandstone uniaxial chemical corrosion creep experiment and using Matlab nonlinear least-squares estimation. The results indicate that the applicability of the models is good. The fitting curves of experimental findings and models and creep parameters of different PH value and stress are obtained at the same time. A conclusion is drawn that with the degree of chemical corrosion increasing, creep deformation and creep velocity increases, and the extent of effect of chemical corrosion is depended on loading.An engineering case is simulated by ANSYS, the phenomenon of creep of tunnel adjacent is esented visually, and the experiment conclusion is verified again.