Pile Reinforcement Techniques Applied Research Of Loess Gully Regions

In loess gully areas, under the long-term erosion of Rain and bridge superstructuredrainage, Bridge pile produce different degrees of slope erosion damage, So a single row ofdouble-column pile produce insufficient bearing capacity, settlement and differentialsettlement and many other issues. Which directly affect the normal use of the pile structureand safety of the bridge superstructure work is also a tremendous risk.First, based on the identification of pile disease of different erosion, combined with theanalysis of typical causes of disease conducted, a pile water erosion damage process model isestablished, on the basis of which a pile bearing capacity and durability assessment methodsof concrete structures for erosion damage is proposed. Secondly, in the analysis of the impactof erosion damage to pile vertical and horizontal load capacity, combined with themechanism of soil erosion damage pressure on the backside of the pile, through theestablishment of complex mechanical model of vertical force, lateral force and bendingmoment on the pile, derived based on "m" method of pile deflection equations, whichcontribute to analyze the variation of the pile horizontal displacement, rotation, bending,shear and pile side soil resistance and helps to analyze the results in making assessment onthe pile bearing capacity and security status of the complex stress state. Finally, based on thepreliminary design of the pile reinforcement scheme, through finite difference softwareFLAC3D, use NULL unit to simulate flushing process, ELASTIC, SHELL and CABLE unitto simulate reinforcement process, so a pile numerical simulation model of the typical scourdisease is eatablished, which analyze the variations of vector deformation, displacement, pilestress, friction resistance, anchor forces of pile-soil model in the entire scour-reinforcedchanges, the maximum unbalanced force of the structure system and key points were tracking.Through numerical results, transverse deflection, pile tension stress, resulting inflection point,the settlement value is too large, insufficient carrying capacity and many other issues isgenerated, which entail the pile in a extremely unsafe state, through the high-pressure jetgrouting in pile bottom forming concretion body, anchor into the soil body, which caneffectively improve the pile adverse forces, making the entire pile-soil system in a relativelysafe state.In this paper, the workable preliminary design, which is a conbintion of reinforcementof key technologies and slope protection technology proposed to different levels of erosiondamage, reinforcing effect is obvious, which can effectively solve practical similarengineering problems in the future.