In the very before post we have discussed the measures to be taken to mitigate collapsible soil related problems. We will now learn the techniques to minimize collapse phenomenon. The measures stated below are suitable only when wetting moisture is occurred from ground surface or from near ground surface infiltration. These measures are:
1. Restricting wetting from irrigation
2. Restricting landscape vegetation near structures
3. Surrounding paved surface is sometimes expected to restrict infiltration of moisture. The extent of paved surface is determined by economy and practicability.
4. Sewer lines and water lines should be kept leak free. For this purpose double pipes and sometimes troughs are used.
5. Forming a low permeable soil to have a barrier to wetness penetration by removal and or replacement and compacting surface layer of foundation soil. In providing barrier for water, soils that are insensitive to moisture is used.
Risks of collapse are avoided as the wetting reduced or controlled to desire degree. In this post and previous we have discussed mitigation and minimizing measures for these soils. Analysis should be performed to compare total cost involved for these measures to economical loss due to suspected collapse settlement of designed or repair of foundation of structures and various alternatives are compared considering these.