Consolidation settlement due to ramp loading

Sivakugan, Nagaratnam; Lovisa, Julie; Ameratunga, Jay; Das, Braja M.

doi:10.1179/1939787913y.0000000017

Cited by 7 publications

(3 citation statements)

References 8 publications

(8 reference statements)

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“…The accuracy of the proposed method was also verified in its ability to predict the experimental oedometer test curves. Sivakugan et al (2014) carried out laboratory oedometer tests with ramp loading on an artificially mixed kaolinite/ sand blend. The ramp loading was performed by filling a bucket, located on the loading arm, with sand scoops over varying periods.…”

Section: Predicting Laboratory Test Resultsmentioning

confidence: 99%

A simple approach to predict settlement due to constant rate loading in clays

Carneiro¹,

Gerscovich²,

Danziger³

2021

S&R

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Classical theory of consolidation was conceived considering loads instantaneously applied. Since then, researchers have addressed this issue by suggesting graphical and/or analytical solutions to incorporate different time-depending load schemes. The simplest alternative is to assume a linearly increasing load. Another approach to predict the average degree of consolidation caused by a constant rate loading is based on instantaneous excess pore pressures during and at the end of construction. This technical note explains why and how this approach leads to substantial errors after the end of construction. A corrected solution is then proposed, based on the concept of superposition of effects. The final set of equations agree with the theoretical ones. A new simple approximate methodology is also presented. Numerical examples using the proposed approach showed an excellent agreement with the analytical solution. The validity of this new approach was also proven by reproducing oedometer test results with a good agreement.

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Section: Predicting Laboratory Test Resultsmentioning

confidence: 99%

A simple approach to predict settlement due to constant rate loading in clays

Carneiro¹,

Gerscovich²,

Danziger³

2021

S&R

View full text Add to dashboard Cite

show abstract

“…To predict the induced settlements, the ramp loading consolidation method is introduced since this two soil behaviors, shrinkage and consolidation, share the same mechanical reason. The normalized settlement-time plot suggested by Sivakugan and Lovisa (Sivakugan, Lovisa et al 2014) is used to predict soft soil settlement. This plot is insensitive to coefficient of consolidation and loading velocity, which allows convenient and efficient application of this method.…”

Section: Discussionmentioning

confidence: 99%

Prediction of shrinkage behavior of soft soil using ramp loading consolidation theory

Zhang

Tehran

Scheuermann

et al. 2019

JGS Special Publication

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Soft soil is a highly saturated soil and its low shear strength undermines the reliability for construction. Hence, to reclaim soft soil for construction, more research is required to improve our understanding on the changes in soft soil properties with ongoing dewatering. Shrinkage behavior of soft soil is studied in this paper. Some of the previous studies focused on the simulation of soil volume change and matric suction change while neglecting the soft soil settlement during fully saturated stage of shrinkage. The aim of this research is to predict the settlement of soft soil at the stage where soil is fully saturated and moisture content is high. During this stage, suction of soil is assumed to be zero and the decreased pore water pressure induced by evaporation is taken as the main reason for settlement. With the soil shrinkage happening, the pore water pressure decreases due to water loss and effective stress increases, being the mechanical reason for soil settlement. To predict the settlement during fully saturated stage of soil shrinkage, the ramp loading consolidation theory is applied. The shrinkage test of saturated kaolin with initial moisture content of 150% has been conducted in laboratory and vertical settlement was recorded. Ramp loading consolidation simulation method is applied to soft soil settlement estimation and the prediction fits well with the experiment.

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“…Then, in an infinitesimal time period, applied pressure on the specimen becomes λdt, resulting in an increase in pore water pressures. The pore water pressures as assumed to be distributed uniformly and some of this excess pore water pressures will be dissipated until it reaches to t f (Sivakugan, Lovisa, Ameratunga, & Das, 2014). Olson (1977) extended Terzaghi's one-dimensional consolidation theory for ramp loading to develop a different expression to determine the average degree of consolidation during the loading and after the final time period, t f .…”

Section: Constant Rate Of Loading Testmentioning

confidence: 99%

Rapid Measurement and Estimation of Saturated Hydraulic Conductivity of Mineral Slurries

Babaoglu¹

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Large strain consolidation (LSC) behaviour of mineral slurries regulates the performance of tailings management and reclamation plans. The hydraulic conductivity-void ratio relationship primarily influences this behaviour, dominating the long-term performance of fine-grained slurries with higher initial water contents. However, the determination of this function can be very challenging and time-consuming, considering the long duration of the conventional tests and significant variation in hydraulic conductivity values with the wide range of void ratios.This study focuses on identifying or creating a rapid method to evaluate the large strain consolidation parameters, especially the k-e relationship, of fine-grained soils by (i) establishing a relationship between the consolidation parameters and more easily measured properties and (ii) designing a self-weight consolidation setup to evaluate the k-e relationship using Instantaneous Profiling Method (IPM). For part (i), a total of 79 k-e data sets of fine-grained soils are examined. Using some of the above innovations, equations are found that require only a single measurement of hydraulic conductivity at a single void ratio. When applying these new equations to the k-e data set, 94% of the predicted k values are within an order of magnitude of the measured data points. This is likely sufficient for this method to be used as a screening tool for tailings treatments. For part ii), the design of a prototype consolidometer is introduced, and the consolidation behaviours of various finegrained soils are evaluated. The prototype is designed as an alternative experimental setup to conventional laboratory tests and aims to rapidly assess the k-e equation for fine-grained soils. The test column was instrumented with tensiometers and capacitance-based sensors c 

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Consolidation settlement due to ramp loading

Cited by 7 publications

References 8 publications

A simple approach to predict settlement due to constant rate loading in clays

A simple approach to predict settlement due to constant rate loading in clays

Prediction of shrinkage behavior of soft soil using ramp loading consolidation theory

Rapid Measurement and Estimation of Saturated Hydraulic Conductivity of Mineral Slurries

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