Study On The Stability And Treatment Technology Of Bridge Pier And Abutment In The Collapse Of Slope Area

The bridge foundation located in accumulation slope will generate thecorresponding force after deformation. Now the pile and slope interaction mechanismand how to layout the anti-slide pile to improve the stability of pile and slope is less, Sothe paper as the landslide treatment engineering of Zong Shu Dang bridge in Yu Xiangexpressway the basis, using PFC2Dsoftware to study the following aspects and drawthe corresponding conclusions:First, through the indoor direct shear test to study the accumulation of physical andmechanical properties, the bulk shear parameter range from25.67o to32.53o, crange from5.13kPa to32.29kpa, and based on the in-situ direct shear test on thededuced elastic modulus; Using PFC software to carry out research on slope stabilityfinding that the failure mode performance caused by lower bulk shear is differentloading. In general the low shear performance of the particle is weakened, theaccumulation slope start to small deformation from the slope angle, and appeargradually cracking surface, with deformation increase, the overall damage. But looseaccumulation in the gravity load loading stress performance upper tension、central shearand bottom compression. In the aspect of slope and foundation pile interactionmechanism, analyzed the effect of different load types on the pile work characteristics,Based on the thrust form, magnitude and the action point of slope in different time anduses software of PFC to analyze the changes of the internal force,found that the slopethrust size changes is obvious influence for the working properties of the pile. Thrustwith4500kN,the displacement is8.3cm, the pile bending moment value is3500kN.m,the pile shear value is-800kN, Thrust with zero, the displacement is1.70cm, the pilebending moment value is970kN.m, the pile shear value is-90kN,so the displacement isincrease of388%,the pile bending moment value is increase of260%, the pile shearvalue is increase of788%;At last study the relative position of the pile and anti slidepile how to influence on the slope and pile stabilize, found that if anti slide pile setbefore the pile foundation, The stability of the slope is better. the landslide caused bylower Shear strength parameters. Anti slide pile should set behind the pile foundation.On contrary the landslide caused by loading. Anti slide pile should set front the pilefoundation. Anti slide pile layout in front of the pile, pile internal force and deformationare less than the anti slide pile layout behind of pile. So from the pile stability considerations, suggest that anti slide pile layout before the pile.In this paper, the conclusion drawn from the research for the stability evaluation ofbridge pile on the loose accumulation body、Slope and pile interaction mechanism pileand how to layout the anti slide pile to improve the safety of pile foundation and slope,has certain theory significance and the certain reference value in design.