[Geotechnical Engineering]

Peng Li, Xinrong Liu，Zuliang Zhong. Mechanical property experiment and damage statistical constitutive model of Hongze rock salt in China [J]. Electronic Journal of Geotechnical Engineering, 2015,20(01):81-94.

Keywords: Deformation Characteristics ; Experimental study ; High confining pressure ; Rock salt ; Statistical constitutive model ; Statistical distribution ; Triaxial compression ; Uni;axial compression

Abstract:

In order to research the mechanical properties of rock salt in Hongze Zhaoji mine lot of Jiangsu, mechanical tests such as uniaxial compression and triaxial compression of equal confining pressure are taken for the MTS815 rock servo testing machine with the analysis on the experimental results. According to the halite deformation characteristics and taking rock plastic strain as the infinitesimal statistical distribution variable, a proportionality coefficient which could reflect the bearing capacity of the broken part of the rock is introduced with the construction of the damage statistical constitutive model which could reflect the strain hardening characteristics of the rock. Test data is adopted for its verification. It is indicated by the research that the bearing capacity of the infinitesimal broken part of the rock salt under uniaxial compression is very small and can be neglected; while it is very big under high confining pressure and cannot be neglected. In addition, the model proposed by this paper could reflect the entire breaking process of the rock salt sample well.