In situ direct shear tests on the large-scale accumulation body and three-dimensional stability analysis of the slope
YANG Ji-hong
DONG Jin-yu
LIU Han-dong
HUANG Zhi-quan
JIANG Tong
Abstract：Took the large-scale accumulation slope of a hydropower station as an example, in situ direct shear tests were conducted. The results show that partial oversized grains of the sample are broken, which result in abrupt change of shear displacement and shear stress. Gurgitation difference of shear surface in the accumulation body is greater than that of the interface between overburden layer and bedrock. Direct shear test curves of accumulation body show that accumulation body become in plastic yield state while the maximum shear stress is obtained. Stress decrease of the interface occurres after the curve reaches to the peak, which show that the interface with the character of strain softening.Shear strength of the interface is significantly lower than that of the deposits. The finite difference and strength reduction methods were adopted to analyze the stability of the accumulation slope under natural, reservoir filling as well as reservoir filling and seismic conditions. And three dimensional shapes of potential unstable body under different conditions were put forward.
Keywords：accumulation body slopein situ direct shear testthree-dimensional stability analysisinterface between overburden layer and bedrock-potential sliding surface-strength-reduction method
Publication Date：2010-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 392-396 )