Research Of The Evaluation And Optimization Of The Diaphragm Sheet-pile Wharf With Separated Relieving Platform

Along with the increasing of ship’s tonnage and pier construction’s movingtowards the large-scale and deepwater direction, traditional style sheet pile wharfrevealed new problems: it is difficult to meet the demands of the sharp increasebending moment of the sheet pile wall in the deep water quay. Therefore, based on thesuccessful application of the half block shade type and the shade type cover sheet pilewharf, the First HangWu Engineering Survey Design Institute put forward a new typeof wharf structure--Pile wharf with separated relieving platform. This structure is anew ascension to sheet-pile quay-wall, and to a certain extent,it solve the problememerged in the deepwater development of the traditional sheet pile wharf, not onlyhas important application value, but also has very important practical significance.The difference between pile wharf with separated relieving platform andtraditional sheet pile wharf is that the pile wharf with separated relieving platform setthe relieving platform and group of pile foundation after the sheet pile wall.And it isbecause the existence of this functional structure that made it have the unmatchedvirtues. On the one hand, the caisson pile can bear the acting force of the soil rely onitself pile intensity; and because the caisson piles are decorated, it will have a soil archeffect between them when dig the subface of harbor basin, then the soil arch deliversthe earth pressure to the caisson piles and increases the stess of them., which reducethe stress of the sheet pile wall. At present, the research of the structure is less indomestic, based on soil arch effect, unloading effect and double row pile theory, thispaper research the computation theory of the pile wharf with separated relievingplatform, and analysis the the wharf structure size and structure types to, in order toprovide a reference for related engineering design. On the other hand,due to theexistence of the unloading platform, it can make weight of soil massexerting on the Platform, and transmit the force to ground soil through the piles, sequentially reducing the Additional lateral earth pressure on sheet pile wall due to theload.First, this paper introduces the composition and characteristics of Pile wharf withseparated relieving Platform, and introduced the lang Ken Daniel earth pressureTheory, the coulomb’s earth pressure theory, The relieving platform theory, parallelwall theory, soil arch theory and double row pile Soil pressure share coefficientmethod; Then based on the above theory, give theoretical calculation results,whichcan the calculation of the earth pressure on this structure. Establish the finite elementanalysis models of Pile wharf with separated relieving Platform compare finiteelement calculation results with geotechnical centrifugal model test results throughthe earth pressure of the front wall and sheltering piles, prove the correctness of thefinite element model, and then by comparing the finite element method with thetheory computation results, to validate the designning earth pressure theory of thestructure. Then, by establishing a finite element model of traditional sheet pile wharfstructure, Compare the earth pressure, bending moments and drawbars’ force of itwith those of Pile wharf with separated relieving Platform structure, describe therelieving effect of The relieving platform and group of pile foundation in finiteelement point. Finally, Through the two major factors that the width of platformtogether with the space of two caisson pile to optimize this structure. Analyse theeffect of the relevant parameters, and give the reasonable results.