软土地区自动伺服系统深基坑变形分析

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中图分类号：TU43 文献标志码：A 文章编号：1005-8249（2025）03-0084-06

DOI：10.19860/j.cnki.issn1005-8249.2025.03.016

Abstract：Indeepfoundation pitengineering insoftsoilareas，thehighcompresibility，lowpermeabilityandenvironmental sensitivityofthestrataposehigherrequirementsforsupporttechnology.TakingaShanghaistoragetankprojectasthe background，for an excavation depth reaching 16.6m （locall18.1m），the support systemadoptsan automaticservo steel support system.Monitoringdata isusedtotrackthelateral displacementofdiaphragm wals，thedynamicchangesofthesuport axialforce，thesurroundinggroundsurfacesetlementandtheresponsecharacteristicsofthewaterandsoiloutsidethepitare systematicaly tracked.Combined withthereal-time feedback and dynamicadjustment mechanism oftheservosystem，its activecontroldeformationabilityisverified.Theresearch foundthattheservosystem，throughthepressurethresholdseing andthecoordinationofmulti-levelsupports，significantlyreducedthemaximumlateraldisplacementoftheunderground continuous wall to 0.1%H （ H is the excavation depth），which is 31.3% lower than the average value of the traditional measurednorms.Theoreticalanalysisshows thattheself-adaptiveregulationofthesystemefectivelybalances thecontradiction between therheological efectof softsoilandthestressreleaseof excavationunloading，andits"prediction-responsecompensation" closed -loop logic provides a new idea for complex stratum foundation pit engineering.

Key words：automatic servo system；deep excavation；deformation control

0 引言

对于深基坑而言，超深基坑往往伴随着更大的变形和更广的影响范围[1]。（剩余5864字）