Analysis on Mathematical Models for the Protection Solutions of a Major Sewage Collector

摘要

The infrastructure development can lead to circumstances in which new roads affect the existing underground public facilities,serving the neighbouring areas.In order to connect the A3 highway with a main road in Bucharest,a new junction arm is planned,crossing on top one of the major existing sewage collectors(a 3.5 m diameter cylindrical structure made of precast segments with interior lining).The paper presents the numerical analyses using 2D of two protection solutions suggested for the collector:(1)a reinforced concrete slab supported on bored piles;(2)a self-standing reinforced concrete arch calotte.Concurrently,a third solution suggested by the contractor was dismissed(protection using a corrugated metal arch structure with independent foundations).All the loading conditions were considered: earth fill and road structure weight,fraffic and exceptional water pressure inside the collector.The results(expressed by the annular and sectional stresses)were compared to the collector's strength capacity.Advantages and disadvantages of each solution were emphasized and design recommendations for the protection structures were made.