Test and numerical simulation study of limestone crack seepage-stress coupling with high seepage pressure

摘要

Firstly got the rock specimens with intrinsic fracture,then carried out seepage tests with high seepage pressure(＞1 MPa),in order to study the seepage regulation with different seepage pressures and confining pressures.The result stated that the relation between coefficient of permeability and net confining pressure is according to exponential relation.With the same net confining pressure,the coefficient of permeability increases according to the seepage increasing.The loading-unloading tests stated that the crack which experienced higher confining pressure and higher seepage pressure,the seepage speed increases at the second loading,that should be resulted from the structural surface damage.Based on theory of seepage-stress coupling and developed fish language of FLAC3D,carried out the numerical simulation according to the test condition,the numerical results are coincident with test.Also analyzed JCR influent for seepage velocity,provided reference for further comprehension for the mechanism of rock crack seepage stress coupling.