soaking the subsoil by water before making the shallow foundation
soaking the subsoil by water before making the shallow foundation
(OP)
Hello, I have a question. I am designing the shallow foundations for a prodaction hall in arid zone in Egypt. In the report of the geotechnical investigation there is recommended to soak the excavation by the continuous flood of water for 2days before the foundation works start. It should help to compact the cemented silty sand layers with large void ratio. Is it common process?
Thank you for your answer.
Thank you for your answer.





RE: soaking the subsoil by water before making the shallow foundation
RE: soaking the subsoil by water before making the shallow foundation
RE: soaking the subsoil by water before making the shallow foundation
As my colleague said, this may be collapsible soil and in order to collapse the soil,you have to flood it and use heavy energy compactor which can compact the soil to a depth of least 2B where B is a width of foundation. If you don't have such equipment you have to dug a foundation to a depth of 2B and replace in a layer of 150mm compacted at 95% Mod AASHTO Density up to a foundation level. Control tests should be observed. Addition of 4% cement in the insitu soil can also used to improve the soil. Flooding the foundation and after that you continue with construction it can lead to early cracking of the building because of immediate settlement which is common to sandy soil of this nature. Building without carrying out above treatment the cracking of the structure will be observed after the heavy rain and this can be very serious. I some times dealing with this kind of problems in our areas so i know what i am talking about.
RE: soaking the subsoil by water before making the shallow foundation