The Calculation Methods Of Internal Forces For Pile And Foundation Beam With Prestressed Anchor-Cable And Their Engineering Application

Anti-slide pile and beam-on-foundation with prestressed anchor-cable are more and more applied to engineering recent years. Due to a few research works and no design norm , the designers generally use simple beam method to calculate the internal forces of these two structures. The structures designed by this method are very big and heavy, and have much waste of the materials, sometimes cause great damage. It is very important to study the reasonable and practical internal force calculating method. This paper studies the calculating method and construction technology with the high slopes of the motorway project from Beijing to Zhuhai in the north of Guangdong province. This paper first studies the forces acting on the two structures according to the structure-soil interaction , and then the calculating theory in details . The forces acting modes are put forward. As for the pile , the method of elastic foundation beam with restriction of transverse deformation is recommended to calculate its internal forces. On the basis of deformation consistence principle, the tensile force of prestressed cables , displacement and internal forces of the pile are calculate. As for the beam-on-foundation , its force characteristics for the pulling anchor-cable step and long term workingstep is first discussed . The main difference between two steps is foundation acting forces. Its internal forces calculating methods separately according to the two steps and Winkler foundation hypothesis are given. The internal forces of the piles and beams for the high slopes of K67and K98 sites are calculated by the methods , and the calculated results are reasonable. The construction technology of the piles and beams is also put forward .