Controlled Gradient Consolidation Test

Lowe, John; Jonas, Ernest; Obrcian, Vladimir

doi:10.1061/jsfeaq.0001259

Cited by 43 publications

(4 citation statements)

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“…If the loadings that apply stress to the soil have a long-term effect on the soil, all of the total stresses are recorded in the soil memory as effective stress [2]. Many researchers have developed different methods for the determination of the preconsolidation stresses that soils were subjected to in the past [3][4][5][6][7][8][9]. The reviews performed by these researchers are all based on Casagrande's method.…”

Section: Introductionmentioning

confidence: 99%

Numune Örselenmesinin Geleneksel Ödometre Deneyleri ile Belirlenen Konsolidasyon Parametrelerine Olan Etkilerinin İncelenmesi

DUMANLILAR¹,

Fener

Balcı

2022

Mühendislik Bilimleri Ve Araştırmaları Dergisi

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This study explores the effects of sample disturbance on the compression curves obtained from oedometer tests and the inferred effective preconsolidation stress (sp'). The samples were systematically disturbed by removing different fractions of the soil ranging from 10%, 20%, 30%, 40%, and 50% and remolding them back into place to reach the same initial void ratio. It was found that when the rate of disturbance was increased, it became more difficult to determine the sp' values on the compression curve; the typical bending point on the compression curve became increasingly indistinct, and negligible changes occurred in the sp' values of the disturbed soil samples up to a disturbance rate of 40%. If the soil samples whose consolidation parameters such as preconsolidation stress can’t be determined are subjected to disturbances greater than 40%, it is recommended that no consolidation parameter of such samples be specified.

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Section: Introductionmentioning

confidence: 99%

Numune Örselenmesinin Geleneksel Ödometre Deneyleri ile Belirlenen Konsolidasyon Parametrelerine Olan Etkilerinin İncelenmesi

DUMANLILAR¹,

Fener

Balcı

2022

Mühendislik Bilimleri Ve Araştırmaları Dergisi

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“…To improve the resolution of test data and meanwhile speed up tests, some alternative 1-D consolidation tests have thrived, such as controlled-gradient consolidation tests (Lowe et al 1969), controlled-stress consolidation tests (Aboshi et al 1970) and CRS tests (Smith and Wahls 1969).…”

Section: Introduction To Crs Testsmentioning

confidence: 99%

A Deviatoric Softening Model to Simulate Compressibility Properties of Soft Clays

Cong¹

2021

Preprint

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Soft clays are often associated with high compressibility due to their high void ratio, low shear strength, and creep behavior. Structures built on top of it can experience excessive settlement issues over a long period of time. The prediction of these settlements has attracted attentions from many researchers for over a century, but accurately predicting them still remains a difficult issue due to complex properties of soft clays, including plasticity, viscosity, anisotropy, soil structure and so forth. Therefore, studying the compressibility of soft clay is of significant importance. This dissertation aims to investigate the influence of plastic deviatoric strains on the compressibility of soft clays. First of all, the dissertation reviews a number of published incremental anisotropic consolidation tests on Finnish clays. The results demonstrate the dependence of soil compressibility on stress ratios. Based on the result, a modified yield surface size deviatoric softening law has been introduced. This softening law describes yield surface softening to be related to plastic deviatoric strain increments. Secondly, a new model named MEVP-DS, has been incorporated into the framework of Yin’s elaso-viscoplastic model to consider deviatoric softening, destructuration, and yield surface anisotropy of soft clay. Furthermore, the verification of MEVP-DS has been done through three phases. Phase one is the simulation of published incremental anisotropic consolidation tests on intact Finnish clay samples. The model results demonstrate MEVP-DS successfully captures the soil compressibility in response to different stress ratios. Phase two is the application of MEVP-DS in modeling 1-D consolidation tests on sensitive Champlain Sea clay. Model results highlight that using MEVP-DS is beneficial for predicting the compressibility and excess pore pressure response of the clay subject to constant rate of strain loading. Phase three is the application of MEVP-DS in simulating a real embankment dam on Champlain Sea clay. MEVP-DS not only simulates 40-year settlement measurements of the dam reasonably well, but also improves the prediction of lateral spreading of the dam. In summary, the MEVP-DS model proposed in this dissertation has shown to improve the simulation of soil compressibility of soft clays subject to 1-D, anisotropic and more complicated loading conditions.

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“…Originally developed by Lowe, Jonas, and Obrican (1969), the procedure is similar to the CRD test; the drainage is allowed on top, and the pore water pressure values are measured at the bottom boundary. In this test, a complex feedback mechanism is needed in order to continually adjust the loading rate (so that the pore water pressures and hydraulic gradient remains constant through the sample.…”

Section: Controlled Gradient Test/ Constant Hydraulic Gradient Test (Chg)mentioning

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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Controlled Gradient Consolidation Test

Cited by 43 publications

References 0 publications

Numune Örselenmesinin Geleneksel Ödometre Deneyleri ile Belirlenen Konsolidasyon Parametrelerine Olan Etkilerinin İncelenmesi

Numune Örselenmesinin Geleneksel Ödometre Deneyleri ile Belirlenen Konsolidasyon Parametrelerine Olan Etkilerinin İncelenmesi

A Deviatoric Softening Model to Simulate Compressibility Properties of Soft Clays

Rapid Measurement and Estimation of Saturated Hydraulic Conductivity of Mineral Slurries

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