水利学报2016，Vol.47Issue(2)：180-188,9.DOI:10.13243/j.cnki.slxb.20150297
黄土剪切损伤演化及其力学特性的CT-三轴试验研究
Structure damage evolution and mechanical properties of loess by CT-triaxial test
摘要
Abstract
A series of CT-triaxial tests of an intact unsaturated Q3 loess and remolded loess were conduct⁃ed using a stress controlled CT multi-function triaxial apparatus developed, and the changes of the internal structure was measured using CT technology, The distinctive CT images and detailed CT data were ob⁃tained during nondestructive of the loess, which explains meso-structure evolution of loess under triaxial shear failure conditions from the microscopic view. The results show that, With the increase of confining pressure, the curves of relationship between meridional stress and axial strain transformed into hardening from weak softening gradually, The curves of relationship of shear failure strain softening between body strain and axial strain transformed into contraction form from dilatation. The curves of relationship between CT number and average axial strain experience a slight increase first, then reduce gradually. The relation curves between average CT number and the axial strain of shear failure strain hardening type increase rapid⁃ly in the initial stage, and then slow growth in the shearing process. The failure process of remolded loess shear specimen in central shear damage smaller,crack mainly derived in the periphery of the samples. The performance of intact loess cementation zone gradually broken, empty area showed due to the slip granular soil around and gradually by compression. CT technology makes the soil meso-structure research to a quanti⁃tative stage, and provides the experimental basis for establishing the constitutive model of soil structure and structural evolution equations.关键词
黄土/细观结构/损伤/力学特性/CT-三轴试验Key words
loess/meso-structure/damage/mechanical characteristics/CT-triaxial test分类
天文与地球科学引用本文复制引用
庞旭卿,胡再强,李宏儒,焦黎杰..黄土剪切损伤演化及其力学特性的CT-三轴试验研究[J].水利学报,2016,47(2):180-188,9.基金项目
国家自然科学基金项目（50778152）；陕西省渭南市科研发展计划项目（2015KYJ-3-2）；陕铁院科研基金 （）
