The Study Of Landslide Stability And Optimization For Anti-sliding Piles Based On ABAQUS

Landslide, collapse, debris flow and other geological disasters are serious in China owing to the influence of special landform and geological environment. As a well used method, anti-sliding pile is vital in practical engineering. In this paper, types, characteristics, stability calculation methods, governance principles and measures of landslides, as well as design theories and requirements of anti-sliding pile were summarized.Stability safety factor of landslide was determined, via combined diagnostic of equivalent plastic zone and feature points horizontal displacement mutations with ABAQUS finite element method, and the rule was rationality evaluated. At the same time, effects on deformation and safety coefficient of multilayer earthiness landslides from soil parameters were analyzed, and the grey correlation sequence of each influence factors was carried out with the combination of grey system theory. Common failure modes of anti-sliding pile were summarized, the exact location of the most critical slip surface of the landslide was searched simulatedly with ABAQUS. The comprehensive assessment of the effect of anti-sliding pile was investigated through depth embedded in stable soil, pile location, pile diameter, pile-head constraint. In addition, the influences of the change of double row piles row distance on the stress of front and rear row pile, deformation mechanism and slope stability safety coefficient were analyzed with finite element method. The simulation results mentioned above were applied to the comprehensive treatment of a landslide in Hanzhong. The conclusions are listed as follows:1) Under the condition of different pile head restraint, the lateral displacement of free pile head is greater than that of articulated pile head or fixed pile head; landslide safety coefficient increased with the enhancement of pile-head constraint.2) Governance effect is obvious as the rationally designed single pile position was 0.35≤k≤0.55. Landslide safety coefficient increased with the increase of pile diameter incipiently, and then levelled off; maximum moment of anti-slide pile appeared around sliding surface, and maximal shear force arose in depth which was a certain distance from sliding surface; it is reasonably that the depth embedded into the stable soil of anti-slide pile is 0.5-1.0 times more than overburden thickness.3) The change of row spacing only affect the size of the pile internal force rather than distribution pattern. When the double row pile row distance is small, the internal force of front row pile is less than that of rear row pile. With the increase of row distance, the internal force of rear row pile reduced gradually, and the internal force of front row pile increased by degrees so as to surpassed that of rear row pile.