高填方涵洞长期减载效果评价OA

As a permanent project,a culvert experiences stress redistribution in the culvert-soil system under long-term backfill loads,resulting in changes in the stress characteristics of the culvert and the load reduction effect.To evaluate the load reduction effect of different load reduction methods,numerical simulations were conducted for 600 months on high fill culverts under four different load reduction methods.The evaluation indicators for the load reduction effect of culverts were divided by the analytic hierarchy process(AHP),and the comprehensive weights of evaluation indicators were obtained by combining the fuzzy matter-element method and the entropy method.Finally,the Euclidean nearness degree at different times under four load reduction methods was calculated,and the overall load reduction effect was quantitatively evaluated.The results are as follows:①The two items with the highest proportion of comprehensive weights are the vertical earth pressure at the center of culverts top and the horizontal earth pressure at the middle of sidewalls;②The overall load reduction effect of the load shedding culvert is the best among the four load reduction methods;③Within the first 36 months after filling,the load reduction effect of the four methods gradually increases,which is better than the load reduction effect at the end of filling;④ The 120th month is the time when the stress state of the culvert structure under the four load reduction methods is the worst.The research results can provide theoretical basis and engineering reference for the long-term load reduction effect evaluation of high fill culverts.