Some Engineering Pile Anchor Support Design Optimization And Monitoring Data Analysis

In this paper, the main content includes: according to the engineeringcharacteristics of deep foundation pit supporting, the latest researchresults at home and abroad for reference, on the surrounding environmentis more and more complicated sandy pebble formation of deep foundationpit, respectively discusses the stress calculation model of deepfoundation pit deformation characteristics of deep foundation pits ispresented. Give us examples of geology and engineering practice, putforward the optimization design under the condition of single comparison,and analysis of the influence of relevant parameters, combining thereality of the construction site, choose the optimal design parameters.Analyzed the third party monitoring unit to provide monitoring data, thehorizontal displacement of foundation pit, settlement, settlement ofsurrounding environment, displacement of deep soil, anchor axial forcedata analysis, timely feedback to ensure safe and reliable, economic andreasonable foundation pit supporting design. This project falls on July21,2012, torrential rain, Beijing’s average rainfall of170mm, the urbanaverage rainfall of215mm, this is a rain for61years the capital’slargest, this project smoothly through the rain test. Through this articleresearch mainly draw the following conclusion:(1) the pile anchor supporting structure, with the increase ofbuilt-in depth, pile body theory of reinforcement volume rendering "V",in a most economic built-in depth, built-in depth is about1/3of the depthof foundation pit. Think in terms of saving resource, should be combinedwith reinforced specified length (9m and12m) on the depth of build-infine-tuning, on the one hand, can reduce the number of steel joint, savemanpower, material, the second is to minimize scrap steel head.(2) in the complex peripheral environment and anchor should be donebefore the design and construction of the detailed engineeringenvironment survey, that is likely to affect the constructing undergroundpipeline, the surrounding buildings, structures, should make key research,when the design schedule enough safety protection distance, preventdamage during construction. The first bolt of about1/3of the depth offoundation pit, the optimal location of the second bolt of the optimal location of about two-thirds of the depth of foundation pit.(3) the engineering slope retaining structure horizontaldisplacement is less than5mm, the top settlement is less than8mm,settlement of surrounding structures2.63mm, maximum deformation of thepile anchor supporting structure can be strictly controlled, ensure thesafety of the surrounding pipeline and buildings, structures andstability.(4) the project part inclined tube measurement data is unusual, inorder to better analyze stress of pile, bolt axial force and the moveddeep structure, the relationship between the recommended design willincrease displacement observation point in deep soil anchor axial forcemonitoring. Local dip tube installation time could reverse, thus leadingto the "zigzag" shape curve presented; North of the engineering surveytube due to cut in addition to the pile head is damaged, can’t monitor,which lacks a bungalow area north of deep soil displacement observationdata, once has the legal dispute is very bad for construction units. Soshould attach importance to the dip tube design, installation,construction management, monitoring personnel should be timelyinspection, found that abnormal timely notification.(5) as the foundation pit excavation, bolt axial force increases,exactly after excavation, bolt axial force basically stable, untilcompletion fat slot backfill. From5deep soil displacement observationcurve in this project, can be found that foundation pit exactly, anchorthe position of the corresponding displacement have been slow to increase,due to the limited data, this article can’t step in-depth analysis.