Abstract
Uneven settlement widely occurs on the roadbed under urban viaducts in operation. Previous studies focused on the effect of soft soil foundation on the uneven settlement of roadbed, without considering the phenomenon and mechanism of uneven settlement at the junction of pier cap and the roadbed under viaduct. The interaction is now considered between the buried depth of cap, the relative stiffness between cap and road subgrade, and the uneven settlement of roadbed. Using the Midas GTS NX software, a numerical analysis model of the deformation of roadbed under viaduct is constructed to study the influence of viaduct cap foundation on the uneven settlement of roadbed under viaduct. The simulated results of uneven settlement of roadbed caused by urban viaduct pier cap show that (1) when the buried depth of cap exceeds 2.35 m, with the increase of buried depth, the fall of roadbed settlement tends to decrease, but the decreased amount is not significant. Considering the factors such as construction cost and complications of construction technology, it is suggested that the best buried depth of cap is about 2.5 m. (2) The fall of roadbed settlement decreases with the decrease of relative stiffness between cap and roadbed. When the relative stiffness exceeds 6.3, the decreasing trend of settlement fall is not significant. The concrete roadbed should have more stiffness in order to reduce the settlement.
Highlights
In recent years, with the rapid development of large-scale infrastructure construction and urbanization in China, construction land is increasingly scarce [1, 2]
E roadbed under viaducts and the pier caps have different levels of settlement, resulting in uneven settlement on the roadbed and around the caps, which are influenced by many factors. e main causes can be summarized from two aspects: the first is the influence of the consolidation of roadbed and the second is the impact of the phenomenon called “vehicle jump.”
(2) When the relative stiffness between cap and roadbed is in the range of 1.58–6.3, the transverse settlement fall decreases smoothly and slowly with the decrease of relative stiffness and the decreasing rate is small. e transverse settlement fall shows a decreasing trend
Summary
With the rapid development of large-scale infrastructure construction and urbanization in China, construction land is increasingly scarce [1, 2]. Uneven settlement of roadbed occurs under a large of number viaducts in Wuhan city, deteriorating the integrity of road subgrade and causing overall or partial subsidence of the subgrade. E difference between these two levels is called settlement fall, which makes the inner side of urban road be wavy. Erefore, it is necessary to analyze and study the influence of the pier caps of urban viaduct on the uneven settlement of roadbed. E roadbed under viaducts and the pier caps have different levels of settlement, resulting in uneven settlement on the roadbed and around the caps, which are influenced by many factors. In order to ensure the safety and comfort of urban vehicle transportation, many researchers at home and abroad have done a lot of studies on the consolidation theory of soft soil foundation, which explains the uneven settlement of urban roads. Terzaghi [3] conducted an unprecedented theoretical study on the consolidation process of saturated soil; based on a series of Advances in Civil Engineering
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