Basing on the data of the CT scanning,density damage increment,pore damage increment and total damage increment are defined.

Based on the theory of thermodynamics and continuum damage mechanics and the energy conversion of loess in load and moistening,the definition of the loess moistening damage variable is put forward,as well as the equivalent energy index of loess moistening damage,which is related to the water content or the saturation degree to describe the moistening damage evolvement procedure.

In this thesis, the initial damage and damage growth induced by several usual metallic contaminations are studied to understand the effects of surface contaminations on the functional damage of fused silica.