冻土初始与附加细观损伤的CT识别模型

采用冻土附加损伤的概念, 给出了冻土在受载荷作用下产生的微裂纹与CT数之间的关系, 冻土密度与CT数以及冻土内部损伤量与CT数间关系模型, 并进行了讨论. 采用干土压实饱和的方法制作了无损冻土试样, 建立了冻土初始损伤的计算模式, 用该模式计算了不同冻土试样的初始损伤, 并以饱水分层压实试样为例计算了加载过程中的微裂纹损伤.

A Distinguish Model for Initial and Additional Micro-Damages on Frozen Soil

Using an additional damage concept, a relationship has been developed between frozen soil density and \%CT\% number of computerized topography (CT), regardless of the initial degree of saturation, so that a calculation model between \%CT\% number and inner additional damage is put forward. Thus, the relationship of \%CT\% number and gaps, which appear along loading process, can be ascertained. Calculation methods for ascertaining initial damage in specimens are suggestedas follows. Firstly, to prepare a perfect sample without any flaw, and then to detect the \%CT\% number of its initial state as \%H 0\% Secondly, to calculate \%CT\% number\% H\+\+1\-\-0\% of supposedly perfect sample but with difference density, and then to calculate the initial damage value D for samples with flaws. This step has been carried out for two series of frozen soil samples, and additional damage values under loading of one set of saturated samples can be determined.FQ(1?46,ZX,BP,DY-W]