determining critical particle velocity for a marine structure

[goingCoastal]

I have question on determining critical particle velocity for a concrete wharf, or the natural frequency of the structure. Blasting operations will be near the structure and need to provide a upper limit which a blaster cannot exceed. Is there a proven method which I can quickly calculate or understand. To better aid your response, the following parameters are:

Structure to Remain:
The Wharf is supported on 24" Square Concrete Bearing Piles. All piles were driven to refusal to a depth of 45 feet. The structure has no batter piles. The uniform Live Load for the structure was design to be 800 psf.

Structure to Remove:
The derelict structure is 80 feet waterward from the face berth, and is submerged to a depth of 35 feet and is 15 feet deep.

Geology:
The area is comprised of Clay,sand, sandstone, Limestone. Both structures are resting on limestone.

Any hints, suggestions, books, programs will be very useful and handy.

V/r

 

[msucog]

There are industry guidelines for PPV. Are you trying to determine whether or not your critical threshold is lower than that?

Here is a pretty good thread

http://www.eng-tips.com/viewthread.cfm?qid=155474&page=24