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Effect of Clogging on Large Strain Consolidation with Prefabricated Vertical Drains by Vacuum Pressure
Abstract Clogging will inevitably occur while using vacuum preloading method to process super-soft soils with high water content. How to quantitatively evaluate the effect of clogging on the consolidation behavior is a key issue to be solved. Based on NALSC (negative axisymmetric large-strain consolidation) model, considering the “internal clogging” and the “external clogging”, a calculation method by using parameter “clogging rate” to reflect clogging problem is proposed for single-well consolidation theory. Effects of clogging rate and clogging occurred time on U s (degree of consolidation defined by strain) and U p (degree of consolidation defined by stress) are investigated. Differences of the effect of clogging on consolidation degree are determined between large-strain and small-strain consolidation theory. The results show that, the larger the clogging rate, the smaller the degree of consolidation of the soil at the same consolidation time. Effect of clogging on U p is greater than U s . The earlier the clogging occurs, the smaller the degree of consolidation at the same clogging rate. Influences on the degree of consolidation for large-strain and small-strain theory are the same. Consolidation rate of soil is determined to a certain extent by the “generalized clogging parameter μ”. The “external clogging” has a greater influence on the degree of consolidation than the “internal clogging” at the same clogging rate.
Effect of Clogging on Large Strain Consolidation with Prefabricated Vertical Drains by Vacuum Pressure
Abstract Clogging will inevitably occur while using vacuum preloading method to process super-soft soils with high water content. How to quantitatively evaluate the effect of clogging on the consolidation behavior is a key issue to be solved. Based on NALSC (negative axisymmetric large-strain consolidation) model, considering the “internal clogging” and the “external clogging”, a calculation method by using parameter “clogging rate” to reflect clogging problem is proposed for single-well consolidation theory. Effects of clogging rate and clogging occurred time on U s (degree of consolidation defined by strain) and U p (degree of consolidation defined by stress) are investigated. Differences of the effect of clogging on consolidation degree are determined between large-strain and small-strain consolidation theory. The results show that, the larger the clogging rate, the smaller the degree of consolidation of the soil at the same consolidation time. Effect of clogging on U p is greater than U s . The earlier the clogging occurs, the smaller the degree of consolidation at the same clogging rate. Influences on the degree of consolidation for large-strain and small-strain theory are the same. Consolidation rate of soil is determined to a certain extent by the “generalized clogging parameter μ”. The “external clogging” has a greater influence on the degree of consolidation than the “internal clogging” at the same clogging rate.
Effect of Clogging on Large Strain Consolidation with Prefabricated Vertical Drains by Vacuum Pressure
Cao, Yupeng (author) / Xu, Jianwen (author) / Bian, Xia (author) / Xu, Guizhong (author)
KSCE Journal of Civil Engineering ; 23 ; 4190-4200
2019-09-05
11 pages
Article (Journal)
Electronic Resource
English
Soil Consolidation and Vacuum Pressure Distribution Under Prefabricated Vertical Drains
| Online Contents | 2019
Soil Consolidation and Vacuum Pressure Distribution Under Prefabricated Vertical Drains
| Online Contents | 2019