Other factors that affect the modulus of subgrade reaction are shape of footing depth of foundation type of soil and type of foundation. The subgrade modulus also known as the modulus of subgrade reaction is a stiffness parameter typically used in defining the support conditions of footings and mat foundations such as that shown on figure 1 the parameter is expressed in units of force length 3 physically however it is defined as the contact bearing pressure of the foundation against the soil that will produce a unit. Modulus of subgrade reaction for footings and mats 7. 
				
			
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