Proceedings - Fifth International Conference & Exhibition on Piling and Deep Foundations, 1994, Bruges, Belgium, (DFI)
Expert system for estimating noise and vibration emissions during pile-driving of sheet piles and steel beams
M.K. Funk & W.J. Gerasch
All classical methods for introducing sheet-piling elements are accompanied by noise and vibration emissions. The soil vibrations are aused by the penetration of the sheet pile into the soil The noise is caused by the pile-driving itself, the equipment and the energy transfer of the equipment to the sheet pile. In order to avoid considerable annoyance to people in the neighboring building caused by vibrations and noise, certain reference values should not be exceeded. Within urban areas the permissible reference values are becoming more and more restrictive. The classical method for performing sheet piling is thus being questionsed more frequently. The expert system reported on here provides active support for the employment of sheet piling in urban construction taking into account existing regulations. Given the equipment for driving in, the ram objects to be driven in, the characteristic values of the soil and the description of the surroundings (topogrphy, adjoining structures, etc.) the expert system estimates the velocities, displacements and accelerations caused by vibrations and noise at various points (on the surface of the ground and in buildings) when sheet piles and beams are driven in. If the permissible reference values are exceeded, permissible values for the equipment for driving in(e.g. permissible energy) and the permissible minimum distance between emission point and immission point will be calculated. Different configurations of inputs are possible with the aid of the equipment. If the equipment is not given, then the expert system suggests possible equipment. The expert system can be implemented on a PC, and an unpractised person can also obtain a quick result by using the simple dialogue structure.
|article #793; publication #36 (IC-1994)|