Google is your friend.
The RG-31 will be my friend.
Boat-shaped hulls have been around for quite some time, generally with an aggressively angled underside. The South Africans are widely regarded as a very active participant in the design of initially mine resistant, and then IED resistant vehicles. We've been using the RG-31 in Afghanistan for a while now because of exactly this design characteristic.
Your particular design would be far from adequate; most IEDs do not explode directly under a vehicle, but instead are offset, or under a wheel, or even fired from well off to the side. There are a numbers of vehicles in use that are designed to mitigate the greatest IED threat profiles, which make great use of materials and geometry to at least somewhat deflect blasts such that they do not penetrate the hull of the vehicle. Moreover, your design would greatly affect the ground clearance, with severe ramifications for off road usage.