Several measures like construction of deep piers, soil replacement, keeping moisture at a constant level, chemical soil stabilization, use of void forms can be adopted to avoid detrimental effects of expansive soil on structures and their foundations.
One or a combination of these preventive methods can be considered while planning construction over expansive soil. The soil investigation report should be available to know the depth of expansive soil and determine the best and economical treatment technique.
The expansive soil exerts heave pressure on the foundations, basements, stem walls, and piers of buildings. As a result, both the substructure and superstructure crack easily and may need expensive repair work.
Initially, the cracks develop at the wall-floor junction and between the wall and the roof slab. Soil expansion also damages the utilities buried in the soil such as sewage lines, water pipes, gas lines, telephone lines, etc.
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