Objective: This in vitro study compared the effects of endodontically treated teeth with flared root canal restored by different post and core systems after intraradicular rehabilitation or not on the fracture strength and fracture patterns.

Finally,compressive pressure for SPP and compressive pressure factor suited for soft foundation are also presented,so as to offer reference for the design and construction of soft soil are static pressure pile.

Analog computations were made to simulate the process of pile driving with the wave equation method to select pile driving hammers and components of a pile driving system in order to discover any possible problems in advance to avoid adverse influence on pile driving operations on site.

Along with the high speed developing of country economic, high speed and heavy load come to be the basic characteristic of road and railage, while traffic load will put on the buildings pile-soil system nest to the road.