The Effect Of High-filling Action And Weak Sandwich Slipped For The Mechanical Characteristics And Engineering Technology Of Pile Foundation With Bridge Piers

In the construction of the bridge, considering the connection section of the bridge and filled sub-grade requires backfilling the subgrade of bridge abutment back, and when there is a certain thickness of soft interlayer under the subgrade, with the increase of the backfill height, can easily lead to landslides and other engineering geological problems which cause hidden dangers of bridge pier and pile foundation.This paper combines Mali River â…¡ Bridge Engineering, by using mechanics calculation and numerical simulation, building internal force and displacement of the bridge pile foundation calculation model and the pier and pile foundation space calculation model. Study on different working conditions of bridge pier and pile foundation of mechanical and displacement characteristics. The main research achievements are as following.(1) The bridge abutment back high filled sub-grade leads to foundation occur additional stress and displacement in the surrounding ground which has a layer of weak intercalation. It would be very disadvantageous to the bridge substructure for safe use.(2) By increasing excavation unloading degree and reducing the distance between sliding surface and setting anti-slide pile can effectively reduce the internal force and displacement of pier pile, in addition,also can avoid or alleviate the unfavorable influences of landslide on pile foundation of bridge pier. But better than the distance between sliding surface and pile top, the effect of excavation load reduction to be more remarkable. When the excavation depth up to 10~12m, the pile-top displacement is within the allowable range, and its meet the stability condition of bridge substructure.(3) To build the bridge pier and pile foundation safety evaluation model on the condition of bridge abutment back high filled sub-grade, scientific and reasonable evaluate the landslide occurrence of possibility and harm size surrounding the bridge pier and pile foundation, providing design alteration,scheme of rectification and the construction code for the Mali River â…¡ bridge, provide experience of design, construction and safety operation for the similar bridge pile foundation.Research results of this paper play an important theoretical significant and engineering practical valuable role in bridge abutment back high filled sub-grade under the action of pier pile foundation engineering which contains a certain soft interlayer foundation environment.The research results can provide theoretical basis and technical support for the design and construction of similar bridge substructure engineering.