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The Impact of Secondary Consolidation on the Consolidation Characteristics of Quasi Over-consolidated Clay and the Design of Surcharge Preloading

Author: JiangTao
Tutor: HuYaYuan
School: Zhejiang University
Course: Civil Engineering
Keywords: Soft soil Preloading Duration Secondary consolidation Equivalent time Pre- consolidation
CLC: U416.1
Type: Master's thesis
Year: 2011
Downloads: 65
Quote: 0
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Abstract


Highway or railroad in soft ground, heap load preloading method because of its cost-effective has been widely used in the treatment of soft ground, soft ground running after preloading some highway has been built that settlement, often during the work is much greater than the theoretical prediction the simple primary consolidation settlement theoretical predictions Soft Ground, and this proposed settlement than expected the preload duration will lead to the use of the work, bring hazards. When the engineering requirements of subgrade settlement will limit preloading method in soft foundation treatment. Surcharge Preloading pressure in the past, and another did not get enough attention is the soil pre-consolidation phenomenon, most of the natural soft soil belongs to the quasi-overconsolidated soil, but in the past less aligned overconsolidated soil research and, therefore, it is necessary to align the overconsolidated soil consolidation characteristics to carry out further research. This article focused on the analysis of the duration of the preloading preloading considering secondary consolidation on the basis of the theory and taking into account the quasi-overconsolidated soil formed in the deposition process, \impact, conduct some research work. First introduced to take full account of the phenomenon of secondary consolidation of soft soil and the pre-consolidation Yin-Graham equivalent time rheological model as the theoretical basis of the full text of the study, followed by sand wells equivalent to one-dimensional homogeneous soil, sand wells effective sand wall foundations, sand drain foundation axisymmetric consolidation of three cases to preparation of the finite-difference program to numerical simulation and analysis of the impact of the secondary consolidation alignment overconsolidated soil consolidation characteristics. Last in the consolidation characteristics analysis results based on the proposed the duration calculation method to determine preload. The results show that, when the time when pre-consolidation absolute equivalent in soft ground, quasi-overconsolidated soft soil consolidation pre-existence of secondary consolidation coefficient ψ greater the faster the pore pressure dissipation, the degree of consolidation The larger the settlement the smaller, the same settlement required the longer this phenomenon, and the phenomenon of physical origin qualitative analysis. Along with the initial absolute equivalent time T0 the increase, the soft soil pre-consolidation effect of the more significant the faster consolidation and long-term settlement with the initial absolute equivalent time increases and decreases, so the soft soil consolidation characteristics analysis and heap load preload designed to take full account of the soft soil \Preloading design determine the quasi-overconsolidated soft ground on the preload duration calculation method on the basis of the above findings.

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CLC: > Transportation > Road transport > Road works > Roadbed, pavement engineering > Subgrade
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