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Foundation Design for Frost Heave

机译:冻胀的基础设计

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摘要

Frost heave is the heaving of the ground surface when frost-susceptible soils, in conjunction with high water table or surface water infiltration, freeze. This paper discusses the foundation design strategy for frost-heave forces in areas with substantial frost depths. Only foundations in seasonal frost areas are discussed. Performance of foundations in permafrost and design of pavement and roads are beyond the scope of this paper.rnAs a real case study, the preliminary study and approach that were implemented for the foundation design in a recent project in Fort Saskatchewan, Alberta, Canada are presented. After preliminary studies, the project decided to implement three primary approaches for foundation designs: (i) Installation of compressible void forms underneath pile-supported foundations; (ii) Installation of 200mm rigid Styrofoam insulation to limit the depth of frost penetration, underlain by 300mm of non frost-susceptible granular fill material, with either soil supported or pile foundations below; and (iii) The use of screw piles with a bond breaker on the shaft above frost line.
机译:冻胀是指易受冻害的土壤与高地下水位或地表水的渗透一起冻结时地面的隆起。本文讨论了霜深较大地区的冻胀力基础设计策略。仅讨论季节性霜冻地区的地基。在多年冻土中的地基性能以及人行道和道路的设计超出了本文的范围。作为一个实际案例研究,介绍了在加拿大艾伯塔省萨斯喀彻温堡的一个最近项目中对基础设计进行的初步研究和方法。 。经过初步研究,该项目决定采用三种主要的基础设计方法:(i)在桩支撑基础下安装可压缩空隙形式; (ii)安装200毫米的硬质聚苯乙烯泡沫塑料隔热层以限制霜冻的渗透深度,在300毫米的非霜冻敏感性粒状填充材料下面铺垫,并在下面支撑土壤或桩基; (iii)在霜冻线以上的竖井上使用带有破胶器的螺旋桩。

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