In ground, rigid pools/structures; located in expansive clay soil

摘要

A rigid type swimming pool or other rigid type structure formed in the ground in which the excavated sides and bottom provides the form for the rigid shell, is subject to increased pressures from the soil, where the surrounding soil is of the expansive clay type. Clay, being of fine soil particles, expands when there is the presence of water, and contracts when there is loss of water. In such a case, flexible, porous expansion material can be placed between the soil and shell to provide room for this movement when the clay soil expands and contracts; due to the variable water percentage present at any given time.