Abstract: In order to study the mechanical characteristics of short anti-sliding steel pipe pile for stabilizing the slope, four groups indoor physical model tests of short anti-slide steel pipe pile for reinforcing debris landslide with different lengths are conducted in the geological disaster prevention technology center completion of China Geological Survey. Through measuring the soil pressure at the rear and fore of short anti-slide steel pipe pile with stress-strain sensors as the sliding force impelled by the heaped load, observing the deformation and failure of the leading edge of landslide in the whole experimental process, analyzing the distribution of landslide thrust, soil resistance at the fore of steel pipe pile and bending moment of short anti-slide steel pipe pile. The results show that the distribution of landslide thrust and soil resistance at the fore of steel pipe pile are triangular-quadrilateral, bending moment is S-shaped distribution; the maximum bending moment and the critical section of short anti-slide steel pipe pile which are located at the vicinity of the sliding surface. And comparative analysis of mechanical characteristics of short anti-slide steel pipe pile with length changing , the limit length value of short anti-sliding steel pipe pile can be developed which totally play the anti-sliding effect; that the length of short anti-slide steel pipe pile should be not less than 2/3 of the slip thickness.

Key words: short anti-sliding steel pipe pile, heaped load, landslide thrust, soil resistance, pile bending moment, limit length value of pile, physical model test