Risk Analysis Of Pile Foundation In Shield Construction Of A2 Ramp Of Wulidun Overpass

Shields under-crossing Wuli overpass pile foundation is the background of this article,based on relevant reference documents,it makes relatively deep research for the risk of shield construction.First of all,according to former theory and inductive conclusi on,choosing which kind risk for the method and making compare research,then picking the most appropriate way for the scene actual situation to analyze the possibility factors.Secondly,comparing with each other and choosing the most probably factors which could influence the risk analysis via relevant document,after that,calculating the proportion for each relevant factor,picking the most obviously influencing factors to control;In the last,simulating the comparison with scene monitoring by using MIDAS GTS NX,so that to make a further verification.Conclusions of this article reaches are:(1)This article analyzed relevant research methods and contents about risk of shields under-crossing buildings which analyzed by domestic and abroad scholars,briefly summarized the influencing factors to pile foundation deformation that caused by shields under-crossing,then controlled pile foundation by controlling parameter,and analyzed relevant laws of pile foundation deformation.(2)Wuli overpass under-crossing buildings is the basis of this background,compa ring and researching the methods of risk assessment with one another,ascertain TF-A HP to analyze and research the risk influencing of shields construction to A2 ramp.(3)Through research of relevant document and calculation of TF-AHP,to mark and calculate the risk influencing factors,ascertain that horizontal and vertical displace ment is the relatively obvious risk influencing factors to A2 ramp during shields construction.(4).Take risk influencing factors as background,making a further analysis of grouting pressure changing to control risk influencing factors,and could clearly simulate the influences to pile foundation during shields construction,is able to know that both too much and less pressure will lead obvious change for pile foundation displacement and surface subsidence,so that to get the pressure range.(5).This article analyzed the built model's rationality and data deviation by comparing shields driving to pile foundation's influence simulating analysis result with actual monitor data,get simulating data that basically matches actual monitor's,toverify the conclusion,ascertain its reliability,and provide theory support for similar situations in the future.(6).Through the theory research to TF-AHP,ascertain the risk factors based on a large number relevant documents,make qualitative and quantitative analysis to control factors of risk,provide relatively reasonable theory methods to risk assessment research.