In contemporary society, it is pertinent to address the feature of the Urban Air Mobility (UAM), a new mode of urban transport, whereby unmanned aerial vehicles transport people and goods with the view to rendering re...
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The land requirement for infrastructure development is increasing, causing engineers to build even in problematic soils like soft clays. Construction on this soil type experiences problems due to the high compressibil...
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ISBN:
(数字)9780784486016
The land requirement for infrastructure development is increasing, causing engineers to build even in problematic soils like soft clays. Construction on this soil type experiences problems due to the high compressibility and very low bearing capacity. Large dept.s of soft clay in many places create a significant challenge in development, including ports, highways, and other infrastructure facilities. Before construction, these grounds must be appropriately strengthened to prevent geotechnical issues like high settlement and bearing capacity failures. The most common technique for enhancing the strength of soft clay is prefabricated vertical drains (PVDs) with preloading. The surcharge is applied on the ground surface as a temporary load for a predetermined period. This additional load develops compression, and associated vacuum pressure expels pore water pressure from the soil, reducing its volume and promoting consolidation. The surrounding soil gets remoulded due to the installation of PVD through the mandrel-creating zone called the smear zone. Furthermore, the PVD discharge capacity gets reduced during the process due to the folding, twisting, and clogging of PVD, which resists the flow through the drain (known as well resistance). Existing analytical methods mainly adopt constant values of permeability and compressibility during the consolidation process;this is inappropriate for highly soft soils, which display high deformation throughout the process. Nevertheless, very few studies captured the nonlinear variation in the smear zone and the time-dependent discharge capacity of the drains. This study uses the large-strain theory with nonlinear permeability in the smear zone, changes in permeability and compressibility during the consolidation process, and time-dependent reduction in the discharge capacity of PVDs for the combined surcharge-vacuum preloading. The nonlinear effective stress equation is solved using the numerical method, fourth-order Runge–Kutta te
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