Water in Grade Beam Void Space
Water in Grade Beam Void Space
(OP)
thread507-223669: Void forms under grade beams
I noticed the above discussion and wanted to add that we have done some research and tested some aspects of the previous thread. With Expansive soil conditions to deal with, either expansive clays or frost heave, under certain and not so uncommon instances, water can and does accumulate in the subject voided space. One of the negatives of these occurrences is that any depth of accumulated water decreases the volume of available voided space. The volume of water then found to be occupying any portion of the subject void, transmits its volume as a hydraulic force equation at a 1 to 1 ratio. If you do a little self equation, the results can be quite troubling, and worth consideration, it is certainly worthy of discussion in this type of format. Boutdat...
I noticed the above discussion and wanted to add that we have done some research and tested some aspects of the previous thread. With Expansive soil conditions to deal with, either expansive clays or frost heave, under certain and not so uncommon instances, water can and does accumulate in the subject voided space. One of the negatives of these occurrences is that any depth of accumulated water decreases the volume of available voided space. The volume of water then found to be occupying any portion of the subject void, transmits its volume as a hydraulic force equation at a 1 to 1 ratio. If you do a little self equation, the results can be quite troubling, and worth consideration, it is certainly worthy of discussion in this type of format. Boutdat...






RE: Water in Grade Beam Void Space
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BA
RE: Water in Grade Beam Void Space
RE: Water in Grade Beam Void Space
If the soil is clay, as it is in most of the province of Alberta, water will not find its way out quickly enough because the soil has an extremely low permeability. It is better to have a waterproof cushion under the grade beam which expands or contracts to meet the pressure, but always fills the void space. In this way, free water cannot get in.
BA
RE: Water in Grade Beam Void Space