岩盐流变特性的研究

Research on the Rheology Behaviour of Rock Salt

用自行设计的杠杆式流变仪，对长山、乔后岩盐的蠕变、松弛、弹性后效流变力学特性进行了试验研究。研究表明，长山岩盐的变形受位错及晶间界面的控制，在长期蠕变中以位错滑移为主，该岩盐主要呈现脆性破坏。乔后岩盐是一种复杂的粘弹塑性体，屈服应力很低。根据试验结果，建立了单向应力状态下的最大应变破坏准则，当ε≤ε０时，岩盐试件将发生破坏。

Using lever rheology instrument designed by ourself the experimental researchabout rheology bevaviours of creep,relaxation and residual elasticity of Changshan's,Qiaohou'srocksalt have been carried out in this paper.It makes clear from research that the delormation ofChansshan's rocksalt is controlled by dislocation and grain boundary,in the course of the long-termcreep,the dislocation is the main strain. The main failure of this rocksalt is brittle. Qiaohou'srocksalt is a kind of matter which possesses complicated visco-elasticity plasticity,The yield stress isvery low. According to the experimental result,a maximum strain failure criterion underunidirectional stress condition has been set up,When ε≥ε0 the reeksalt sample will be failure.