Liquidity index and overconsolidation
4.4 Liquidity index … index tests (such as water content, density measurement, grain size distributions, atterberg linearly in an overconsolidation zone from. Liquidity index. -. IP solidated, while overconsolidated clays have a preconsolidation pressure At such levels of overconsolidation, the stiffness of the. consolidation settlement of overconsolidated fine grained soils and they are Atterberg limits reflect the relative amount of clay sized particles and their Preconsolidation pressure is the maximum effective vertical overburden stress that a particular soil sample has sustained in the past. This quantity is important in geotechnical engineering, particularly for finding the expected settlement of foundations and embankments. Alternative names for the preconsolidation pressure are preconsolidation stress, pre-compression stress, pre-compaction stress, and preload stress. A soil is called overconsolidated if the current effective stress acting on the
Comparison of Atterberg limits. which has a liquidity index of more than 0.5. overconsolidated clays with a plasticity index equal to 20% or lower, the shear
lines for each value of over-consolidation ratio tested (see. Figure. 2.2). clays was chosen by ensuring that the same liquidity index was achieved as that used tween factor RM and horizontal stress index (KD) for boulder clays was from DMT for stiff overconsolidated clays. ZBIGNIEW Liquidity index, IL (–). 0.0–0.20 . Figure 5.12 Atterberg Limits and Stress History of Sergipe Clay (Ladd and Lee Other Notation: NC = Normally Consolidated; OCR = Overconsolidation Ratio; They are sometimes described as overconsolidated because they are dense rather Group the results according to their liquidity index, water content, density
3. The liquidity index and, by inference, also the sensitivity are important indicators of the preconsolidation stress for a given soil. For a given clay, the higher the liquidity index is, the lower the preconsolidation pressure would be expected to be, yet the correlations proposed in the paper do not account for this im-portant parameter. 4.
liquidity index is examined and found to also correlate strongly with the logarithm of undrained shear strength, however it is shown that no great statistical improvement is present compared with the semi- Fig. 2. Correlation between undrained shear strength and liquidity index. Fig. 3. Correlation between undrained shear strength and liquid limit. Fig. 4. Correlation between undrained shear strength and preconsolidation stress. Fig. 5. Box diagram of undrained shear strength as a function of geological origin. The Liquidity Index (LI) and Consistency Index (CI) • The relative consistency of a cohesive soil in the natural state can be defined by a ratio called the liquidity index (LI), which is given by: • The in situ moisture content for a sensitive clay may be greater than the liquid limit. Ruwan Rajapakse PE, CCM, CCE, AVS, in Geotechnical Engineering Calculations and Rules of Thumb (Second Edition), 2016. 5.4 Overconsolidation ratio. Overconsolidation ratio is defined as the ratio of past maximum stress and present existing stress. The existing stress in a soil can be computed based on the effective stress method. The overconsolidation ratio of eemian gyttja determination. The overconsolidation ratio is an important parameter that determines the value of stress history exerted in the past on the subsoil in 0 0 v OCR k qt v σ σ ′ − =⋅ (2) where k is the overconsolidation factor with a range of 0.3 to 0.5 and σv0 is the vertical geostatic stress. For intact clays, a first-order estimate of the preconsolidation stress can be obtained from net cone tip resistance used k = 0.33 (see [2]).
Summary of oedometer testing on heavily overconsolidated clays. test results are not required and that numerous Atterberg limits tests can be used to.
stress history, over-consolidation ratio, plasticity index and similar soil loading condition and liquidity index (C.). a is related to the vertical effective stress (0). in obtaining full saturation in overconsolidated Saturation criteria for heavy overconsolidated cohesive soils plasticity index PI and liquidity index LI for each 7 May 2011 liquid limit of 15-420%, plasticity index of 3-285%, liquidity index of The shear strength in the overconsolidated stress range is a function of 6 Jan 2014 In turn, because the sensitivity is a function of the liquidity index, the installed anchor in normally consolidated and overconsolidated clay. lines for each value of over-consolidation ratio tested (see. Figure. 2.2). clays was chosen by ensuring that the same liquidity index was achieved as that used tween factor RM and horizontal stress index (KD) for boulder clays was from DMT for stiff overconsolidated clays. ZBIGNIEW Liquidity index, IL (–). 0.0–0.20 .
Preconsolidation pressure is the maximum effective vertical overburden stress that a particular preload stress. A soil is called overconsolidated if the current effective stress acting on the soil is less than the historical maximum. See Atterberg limits for information about soil properties like liquidity index and liquid limit.
Fig. 2. Correlation between undrained shear strength and liquidity index. Fig. 3. Correlation between undrained shear strength and liquid limit. Fig. 4. Correlation between undrained shear strength and preconsolidation stress. Fig. 5. Box diagram of undrained shear strength as a function of geological origin. The Liquidity Index (LI) and Consistency Index (CI) • The relative consistency of a cohesive soil in the natural state can be defined by a ratio called the liquidity index (LI), which is given by: • The in situ moisture content for a sensitive clay may be greater than the liquid limit. Ruwan Rajapakse PE, CCM, CCE, AVS, in Geotechnical Engineering Calculations and Rules of Thumb (Second Edition), 2016. 5.4 Overconsolidation ratio. Overconsolidation ratio is defined as the ratio of past maximum stress and present existing stress. The existing stress in a soil can be computed based on the effective stress method.
The overconsolidation ratio of eemian gyttja determination. The overconsolidation ratio is an important parameter that determines the value of stress history exerted in the past on the subsoil in