Question

Why do buildings on permafrost have potential structural issues?

Answer 1

A. The heat from buildings melts the ice in the permafrost below and the water is then  displaced.

Explanation:

• Permafrost are frozen soils in temperate and polar regions.
• For a long period of time, if the soil remains frozen due to the presence of water that remains above freezing point, permafrosts forms.
• Permafrost are usually a bane to construction works.
• When the Trans-Alaskan Pipeline was being built, accommodation was made for the permafrost in the terrain.
• Buildings sitting on permafrost can cause the soil to heat thereby releasing the frozen soil as melt water with soil.
• This can cause displace of buildings in very serious cases.

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Answer 2

A

Permafrost is formed when the water that is infiltrated in soil gets frozen along with the soil due to temperatures going below zero degrees in temperatures.

Explanation:

The house will cause the ice of the permafrost to melt in two ways. Firstly the heat from the building will be conducted by the local ground causing the temperatures to rise and melt the ice. In addition, the pressure of the house on the local ground also lowers the melting point of water hence melting the ice.

When the permafrost melts, the water drains from the soil leaving the ground very porous due to the spaces in the soil that the ice occupied. The ground will, therefore, cave in slowly under the pressure of the house shifting the foundation and causing the walls to crack.

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