Experimental conditions and technical limitations, however, have slowed the study of rock salt nonlinear creep modeling as related to the obvious nonlinear properties in the attenuation creep and steady-state creep rock salt stages, especially soft rock. Rock salt creep modeling research has experienced enormous progress marked by numerous research achievements. Creep constitutive relation was developed under different confining pressure and axial pressure for each rock salt type.
conducted creep property experiments of two rock salt types, rock salt from greisens salt mine and rock salt with interlayer. researched Changshan and Qiaohu rock salt and observed that, following analysis of the evolution and destruction process of cracks on rock salt specimens, the two rock salt types differed relatively significantly in the creep damage process, mainly due to difference in NaCl content, grain size, and cementation between grains. Based on the rheological model (Lubby2), using continuum damage mechanics and considering the displacement, hardening, softening and recovery mechanism, and the damage and damage recovery mechanism of rock salt, Lux and Hou proposed the Hou/Lux creep damage model. applied continuum damage mechanics in the creep analysis of rock salt to study the unelastic flow caused by damage from the transition of creep stage to the damage accumulation in accelerated creep stage and to the final destruction process. Hunsche and Cristescu employed diversified loading methods to conduct research on rock salt properties in multiple creep stages. Paul researched the creep properties of four types of rock salt.
FLAC3D UNITS CONSTITUITIVE MODEL SERIES
Rock salt creep research has been the subject of a large number of studies: King produced a series of experimental research on rock salt creep properties under various temperatures and different axial stress levels, identifying the relationship between deformation and time.
A numerical simulation of multistage loading creep was developed with the model and resulting calculations were found consequently to coincide with previously tested data. Rock salt creep properties are studied in this paper through employing combined methods of theoretical analysis and numerical simulation with a nonlinear creep model and the secondary development in FLAC 3D software. Creep characteristics are integral mechanical properties of rock salt and are related to both long-term stability and security of rock salt repository.
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