%0 Journal Article
%A LIU Meng
%A TENG Wei-fu
%A XU Fei
%A YUAN Xiang
%T Experimental Study on Shear Strength of Calcareous InterlayerSoil in the Third Member of Badong Formation
%D 2020
%R 10.11988/ckyyb.20191002
%J Journal of Yangtze River Scientific Research Institute
%P 151-156
%V 37
%N 5
%X The weak interlayer soil between the marlstone and limestone in the third member of the Badong formation, which widely exists in Badong County of the Three Gorges Reservoir Area, was taken as  research object. The effect of CaCO<sub>3</sub> content (0%, 2%, 4%, 6%) on the shear strength of weak interlayer soil were studied via unconsolidated undrained triaxial test (UU). Moreover, the changes of internal porosity and cementation degree of soil samples before and after the triaxial test were observed using CT scanning. On such basis, the mechanism of shear strength variation of calcium-containing weak interlayer soil was analyzed. Results indicated that the shear strength of interlayer soil increased with the rising of CaCO<sub>3</sub> content in soil samples because CaCO<sub>3</sub> enhanced the internal friction angle of soil by reducing soil porosity and changing soil particle morphology. In the meantime, the cohesion of the soil was strengthened by improving the cementing ability of the soil, thereby increasing the shear strength. In addition, the change of cohesion was more affected by the content of CaCO<sub>3</sub>, while the change of internal friction angle was less affected by the CaCO<sub>3</sub> content.
%U http://ckyyb.crsri.cn/EN/10.11988/ckyyb.20191002