Factors to Consider in Foundation Design Chapter 02在02章#基础设计考虑因素.pptVIP

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Factors to Consider in Foundation Design Chapter 02在02章#基础设计考虑因素.ppt

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Factors to Consider in Foundation Design Chapter 02在02章#基础设计考虑因素

Factors to Consider in Foundation DesignChapter # 02 Lec. # 03 What are the key Factors? Effect of Frost Line Location consideration for Spread footings Net versus Gross Soil Pressure: (Design soil pressures) Erosion Problems for structures adjacent to flowing water Corrosion Protections Water Table fluctuation 1-Effect of Frost Line Footing should be placed below or above the frost line ? It should be Placed below frost line. Possible frost heave of the building and because alternate freezing and thawing of the soil tends to maintain it in an unconsolidated or loose state Frost or Permafrost conditions Permafrost is a condition of permanently frozen ground where the ground temperatures are never higher than 00C. Construction in these areas requires that the foundations be placed below this material and into permafrost. Where the soil is considered thaw-stable, the foundation design is the same as in temperate regions. Thaw stable soils are granular materials like coarse sands and gravels. Pile foundations are more reliable for permanent frost areas but are much more expensive. 2-Location consideration for Spread footings Case # 01 When footings are to be placed adjacent to an existing structure, as indicated in figure 01, the line from the base of the new footing to the bottom edge of the existing footing should be 450 or less with the horizontal plane. From this requirement it follows that the distance m of figure 01 should be greater than the difference in elevation of the two footings, zf. If the new footing is lower than the existing footing There is a possibility that the soil may flow latterly from beneath the existing footing. This may increase the amount of excavation somewhat but, more important, may result in settlement cracks in the existing building. This problem is difficult to analyze; however an approximation of the safe depth zf may be made for Φ–c using equation 01 02. Location consideration for Spread footings Case # 02 Since σ3=