Construction Methods Of Mat Footing On Wet Ground Level
Construction Methods Of Mat Footing On Wet Ground Level
(OP)
Our foundation is designed to be Mat Footing. Per Soil Test Report, water table is found at elev -1.8m with sandy material. The Geo-Tech Engineer recommends to backfill rock material to a depth of 1.0m. As backfilling is progressing up to a depth of 60cm, compaction was started per direction of consultant, but the rock material sink down even if we add more fill material.
My question is, what is the appropriate method of construction on this kind foundation? Any expert on this, please extend your help. I am new on this kind of site condition.
My question is, what is the appropriate method of construction on this kind foundation? Any expert on this, please extend your help. I am new on this kind of site condition.





RE: Construction Methods Of Mat Footing On Wet Ground Level
RE: Construction Methods Of Mat Footing On Wet Ground Level
So no need of rock fill as recommended by Geo-Tech Engr?He is requiring us to place rock fill with sizes range from 2" - 6", up to the level of 1.0m from the soft ground level and then place a blind concrete of 150mm thick.Please clarify further on this point.
RE: Construction Methods Of Mat Footing On Wet Ground Level
Since the mat foundation needs proper soil to bear on, suggest that you follow to Geotech Engineer's recommendation. You also asked about the appropriate method of construction when ground water is a problem. The best way is to dewater the soil. For a relatively shallow excavation, such as yours, this MAY be performed by using diaphragm (mud hog) pumps to keep the excavation free of standing water while work is underway. Under severe groundwater conditions, pumping may be needed continuously - day & night. There are other ways to handle high water levels such as wellpoints and cofferdams, but I doubt if you will need to them.
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RE: Construction Methods Of Mat Footing On Wet Ground Level
Water is not a problem. The problem is, when compacting the fill material in layer of 60cm thick, the material sink down even if we add more rock material. In this case, we cannot achieve the required compaction density of 95%. In other words, the ground beneath the fill material is not stable. Please kindly give your opinion.
RE: Construction Methods Of Mat Footing On Wet Ground Level
RE: Construction Methods Of Mat Footing On Wet Ground Level