Longitudinal load adjustment technology for high embankment culverts based on settlement control
XIE Yong-li1, FENG Zhong-ju1, LI Shao-jie1, 2, DONG Yun-xiu1, HAO Yu-meng1, 3, ZHANG Meng-ran1, HU Hai-bo1
1. School of Highway, Chang’an University, Xi'an 710064, China;; 2. China Railway Construction Group Co., Ltd., Beijing 100040, China; 3. China Second Highway Survey and Design Institute, Ltd., Wuhan 710065, China
Abstract：In order to solve the disease problem caused by longitudinal uneven settlement of high embankment culverts, based on their vertical settlement control mechanism, the influences of the characteristics of culvert fill and foundation soil and different EPS plate parameters on the vertical soil pressures at culvert top and the soil settlements at culvert bottom are studied by means of the finite element software. The influences of longitudinal EPS plates on settlements of high embankment and culvert are studied through the centrifugal model tests. Through numerical simulation, the influences of different moduli, laying ranges, thicknesses of EPS planes and ranges of ground treatment on the reduction rate of longitudinal settlement difference of high embankment culverts are analyzed. The results show that: (1) The influences of modulus and Poisson's ratio of the fill on vertical soil pressures at culvert top and soil settlements at culvert bottom are not significant. (2) With the increase of modulus and Poisson's ratio of foundation soil, the longitudinal settlements of soil at culvert bottom tend to uniform distribution. (3) The results of numerical simulations and centrifugal model tests indicate that the longitudinal laying of EPS plates along the culvert leads to the best effectiveness of longitudinal load adjustment of culverts. (4) Through numerical simulation, the design method for high embankment culvert loads based on longitudinal settlement control is obtained.
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