I have been asked by a piling engineer to try to come up with an alternative to static pile testing in a restricted access site. Normally a pile test is carried out by applying a static load to the ground and measuring the deflection of the pile under the load. This of course requires a large pile of concrete blocks or similar to act as the counter weight. The alternative is to carry out what is known as a dynamic pile test, where a weight is dropped a known distance onto the pile and the pile response measured. I was wondering if there is a way to calculate the how heavy a weight would need to be dropped over a distance to equal the force applied by a static object. All of the equations I have seen to calculate the force of impact of a falling object require the distance the impacted surface moves to provide the answer. But what if the dropped weight is insufficient to cause any movement? This implies an infinite force. Perhaps the distance of the rebound has a bearing? Any feedback is welcome.