Abstract：Abstract：The effects of various lengths and location of deeply buried piles on the stability of a slope are simulated by nonlinear finite element method with shear strength reduction. Conclusions are made from the simulation results as follows：(1) the slope can acquire effective stability by deeply buried piles as other reinforcing structures；(2) when the length of the deeply buried piles is relatively short，the critical slide surface will slip along the top of the pile；and (3) the location of slide surface determines safety of the slope. As the pile length increases，a secondary critical slide surface will displace and the safety factor of the slope will increase. If the location of the secondary critical slide surface is unchangeable with pile length increase，the safety factor of the slope is also unchangeable. Distribution of the internal forces in deeply buried piles is more reasonable than that in traditional full-length piles；and both the maximum bending moment and the maximum shear force in deeply buried pile are much less than those in full-length pile. Deeply buried piles will be widely used in stabilization of slopes. The applications to deeply buried piles are restricted with the ratio of the strength of slide mass with that of slide area，the site of secondary slide surface，and the length of deeply buried piles. It would lead to failure if the limitations of deeply buried piles stabilizing the slope were not considered in the design.
