ROAD BRIDGE FOUNDATION DESIGN METHOD

摘要

PROBLEM TO BE SOLVED: To provide a road bridge foundation design method that uses measured values that are concrete to an extent that they are practicable from an original position shear friction test (SBIFT). SOLUTION: First, the shear stress-vertical stress curve and the water supply volume-vertical stress curve are calculated for each layer of the ground to which this road bridge foundation design applies. Then the circumferential frictional force of each ground layer is calculated using an adhesive force and an inner friction angle obtained from the shear stress-vertical stress curve, and the side pressure value obtained from the water supply volume-vertical stress curve. Further a deformation coefficient is obtained from the water supply volume-vertical stress curve. An ordinary correction coefficient is set up at 2 and an earthquake correction coefficient is at 4 for use in the estimation of a subgrade reaction coefficient. The circumferential friction force of each ground layer is calculated using the adhesive force and the inner friction angle obtained from the shear stress-vertical stress straight line and the side pressure value obtained from the water supply volume-vertical stress curve if the layer is a clay layer, and may be estimated from the value N if the layer is a sand and gravel layer. COPYRIGHT: (C)2008,JPO&INPIT