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Повышение эффективности свайных фундаментов, устраиваемых в пучинистых грунтах

Повышение эффективности свайных фундаментов, устраиваемых в пучинистых грунтах

Abstract

The recommendations about calculation offered in this article extend on the ferroconcrete two-conical piles immersed by cave-in for the bases of buildings and constructions which design is developed by "Highways and Bridges" chair of the Perm national research polytechnical university. Two-conical piles are characterized by the increased resilience to action of forces of a frost heaving in comparison with traditionally applied prismatic piles at the expense of the return orientation of the top cone. The description of a method of calculation of the base in the form of a bush from two-conical piles is provided in frosty water-saturated clay soil from the point of view of its stability against action of forces of a frosty heaving. The comparative analysis of the obtained settlement data with experimental is carried out. The technique of determination of size of a frosty heaving of two-conical piles as a part of base bushes is developed and in number realized by forces of a frosty heaving when modeling soil as linearly deformable space. The calculation method which basis the condition of equality of the works made by forces of a frosty heaving, and forces interfering a frosty heaving of not loaded pile bases from two-conical piles is is offered. The method allows to project with an accuracy sufficient for practical purposes the bases in water-saturated clay soil.

Предлагаемые в данной статье рекомендации по расчету распространяются на погружаемые вдавливанием железобетонные двуконусные сваи для фундаментов зданий и сооружений, конструкция которых разработана кафедрой «Автомобильные дороги и мосты» Пермского национального исследовательского политехнического университета. Двуконусные сваи характеризуются повышенной сопротивляемостью действию сил морозного пучения по сравнению с традиционно применяемыми призматическими сваями за счет обратной направленности верхнего конуса. Приводится описание методики расчета фундамента в виде куста из двуконусных свай в сезоннопромерзающем водонасыщенном глинистом грунте с точки зрения его устойчивости против действия сил морозного пучения. Проведен сравнительный анализ полученных расчетных данных с экспериментальными. Разработана и численно реализована методика определения величины выпучивания двуконусных свай в составе фундаментных кустов силами морозного пучения при моделировании грунта как линейно-деформируемого пространства. Предложен метод расчета, в основу которого положено условие равенства работ, совершаемых силами морозного пучения, и силами, препятствующими выпучиванию ненагруженных свайных фундаментов из двуконусных свай. Метод позволяет с достаточной для практических целей точностью проектировать фундаменты в водонасыщенных глинистых грунтах.

Keywords

ДВУКОНУСНАЯ СВАЯ,ПУЧИНИСТЫЙ ГРУНТ,ГЛУБИНА ПРОМЕРЗАНИЯ,МОРОЗНОЕ ПУЧЕНИЕ,ВЫПОР ФУНДАМЕНТА,НАПРЯЖЕННО-ДЕФОРМИРОВАННОЕ СОСТОЯНИЕ ГРУНТА,ДЕФОРМАЦИИ ПУЧЕНИЯ ГРУНТА,BICONICAL PILE,HEAVING SOIL,FREEZING DEPTH,FROST HEAVING,FOUNDATION BUCKLING,SOIL STRAIN-STRESS STATE,SOIL HEAVING DEFORMATION

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
gold