A Study On Seepage Theory Model And Its Parameters In Rock Mass

At present, the study on the permeability model and theory, and the choice of parameters have a important effect for the development. Based theoretial studies and laboratory tests, the unloading effects on rock permeability have been depicted. Parameter optimization with a new GA algorithm. The main conclusions are as follows: (1) On the basic of the cubic law, a relation between permeability and the unloading stresses is suggested and is testified by triaxial experiments. (2) Observation on intact and cracked rock samples has been done by using SEM, microscopic method and CT technique. A single nearly axial fracture has been found in most cases. (3) The test shows that the relationship between the permeability and the effective normal stress is hingly nonlinear when the unloading normal stress reaches 80% of its initial valve. (4) By applying the cubic law and to a nonparallel smooth wedge-shape walled fracture, the distribution of pore pressure along the walls is derived and its effects testified by computing the stability of a rock slope. (5) The error function solutions of the one dimensional consolidation theory can eliminate the Gibbs phenomenon when the time factor is small.The time-square method is shown to be derived from this solution. It has also been shown that by means of the least square method to evalvate the coefficient of consolidation will be more appropriate. (6) A new GA method is suggested by the integration of the BFGS operators with AGA method and the defects of some parameter optimization method are largely eliminated. It is adopted to the parameter optimization for the permeability and ocnsolidation problem with satistactory result.