Research of the soil pressure coefficient and soil archingin sandy soil at the top of arch culvert

• 1、Taiyuan University Of Technology,Shanxi Taiyuan 030024

Abstract：The experiment is designed with orthogonal analysis method which is researched for the soil pressure coefficient at the top of the box culvert filled by the common sand in northern China. And it is researched for soil arching effect through numerical test.Research shows that: In filling factors,soil pressure coefficient is the most sensitive to the chenge of internal friction angle, elastic modulus is the second, Poisson's ratio is the smallest;with the increase of angle,the coefficient increase,when the coefficient is small(φ<25 ),the curve is steep,and when the coefficient is large(φ>25 ),the curve is gentle;with the increase of elastic modulus,the coefficient shows the tendency of growth first and decrease then,when E=13MPa the coefficient is the maximum;the coefficient appear the trend of decrease with the increase of the Poisson's ratio,and when Poisson's ratio is between 0.32 and 0.34,the rising trend is most obvious;the curve of soil arching is find at 2m on the top of the culvert,the curvature is increase with the increase of the internal friction angle,and is decrease with the increase of the high to the top of culvert.

Keywords： Box culvert,Sand index,Soil pressure coefficient,Soil arching