Abstract
In order to reduce the foundation settlement, conserve resources, and be environmental-friendly while increasing the use of soil resources, an artificial crust layer formed by in situ stabilization is proposed to combine with prestressed pipe piles over soft ground in road construction. In this study, a centrifuge test and two-dimensional coupled-consolidation finite-element analyses are conducted to simulate the construction of an embankment. And a two-dimensional parametric study is conducted to study the performance indicated by maximum long-term settlement, excess pore water, and tensile stress under various conditions. The results of the centrifuge test clearly show that the measured settlement, excess pore water, and tensile stress are in good agreement with the calculated results. In addition, the key factors of pile spacing and thickness and strength of the crust have an influence on the maximum settlement, stress of the foundation, and tensile stress of the crust using the two-dimensional coupled-consolidation finite-element analyses. And the stress transfer regular of the foundation is analyzed under various conditions. Moreover, the failure of the crust contained tensile cracking and shearing failure and the thickness of the pile that pierced the crust are also affected by the key factors.
Highlights
Settlement of the building and slope stability accidents are induced by the construction of an embankment
In order to conform to the engineering, the interaction between foundation-cushion-load under rigid composite foundation was studied by centrifugal model test. [1,2,3]
A comparison of the results of the centrifuge test and the finite-element analyses indicates that the measured settlement, excess pore water, and tensile stress of the centrifuge test are in good agreement with the calculated results; twodimensional coupled-consolidation finite-element analyses were conducted to simulate the construction of an embankment for stabilization combined with rigid piles
Summary
Settlement of the building and slope stability accidents are induced by the construction of an embankment. Technological improvements of the foundation have been developed with conserving resources, preventing environmental pollution, and increasing the use of soil resources. It has been proposed to combine prestressed pipe piles with an artificial crust layer formed by in situ stabilization over soft ground during road construction in order to reduce the settlement of foundation. E artificial crust, formed by in situ stabilization with a higher compressive modulus and cohesion, replaces the traditional sand cushion in pile-supported embankments, which reduces the total and differential settlement and improves the global stability of Earth structures on a deep soft soil layer. It is a common method to make the composite foundation with acceptable settlement so as to maintain the proper function of the high standard road or the embankments on the soft ground. In order to conform to the engineering, the interaction between foundation-cushion-load under rigid composite foundation was studied by centrifugal model test. [1,2,3]
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