Compressibility characteristics of a Portuguese soft deposit

Coelho, Palf; Lemos, Luís

doi:10.1201/9780203739501-101

Cited by 3 publications

(1 citation statement)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The w L can be determined by the fall cone method using parallel samples. On this basis, natural clay test data from around the world, especially those from the coastal areas of Southeast Asia, were collected, and it was found that C αmax had a good linear relationship with the w L , as shown in Figure 16 [1,9,12,16,23,50,55,58,59,[61][62][63][64][65][66][67][68][69][70][71][72][73][74][75].…”

Section: Relationship Between C αMax and Liquid Limitmentioning

confidence: 99%

Influence of Structure and Liquid Limit on the Secondary Compressibility of Soft Soils

Jiang

Wang

et al. 2020

JMSE

View full text Add to dashboard Cite

The macroscopic mechanical properties of natural sedimentary soft soils, which are usually linked to their microstructure, are different from those of remolded soils. The interaction between soil structure and mechanical behavior is a manifestation of structural mechanics effects. It is essential to understand the effects of secondary compressibility to predict long-term foundation deformations. The effects of soil composition on secondary compression deformation are little studied, and the soil structure is rarely involved in the compression process. The sedimentary environment creates the initial composition and structure of soft soil, and it also basically determines its grain size and mineral composition, while different depths give soft soil different overburden pressures, and the soil composition and depth directly affect its yield stress during compression. So, natural sedimentary soft soils sampled at different depths and from different sedimentary environments (such as marine-neritic facies, sea shore facies and limnetic facies) were selected to study the influence of structure on the secondary compression coefficient Cα during pressure change and the relationship between soil composition and Cα. One-dimensional compression and consolidation creep tests were carried out on undisturbed and remolded samples. The undisturbed samples were obtained by the thin-wall samplers in rotary wash borings, and the quality of the samples met the test standard. Based on the concept of the void index Iv and the intrinsic compression line (ICL) proposed by Burland, the role of structure in the compression process was studied, and the influence of soil composition and structure on secondary compression characteristics was summarized. The Cα/Cc values are 0.031, 0.034, 0.030, and 0.036 for Shanghai, Tianjin, Suzhou, and Ningbo soft soils, respectively, within the range of inorganic clays and silts (0.04 ± 0.01) given by Mesri. According to the compression index Cc obtained by compression test, Cα/Cc can be used to estimate Cα. The yield stress of normal consolidated soil is near pre-consolidation pressure, while that of structural soft soil is greater than its pre-consolidation pressure. Natural sedimentary soft soils show over-consolidation characteristics due to the action of the structure; the soil structure resists the external load and hinders secondary compression. When the soil structure is almost destroyed, the pressure reaches the structure full yield stress P′. The tests of structural soft soils show that Cα changes with pressure before the structure completely yields, first increasing and reaching peak Cαmax near P′; the value of P′ is approximately 1.6–3.0 σ’k, where σ’k refers to the structure yield stress of soil obtained by the Casagrande method. After the structure disappeared, Cα gradually decreased and then stabilized, which is considered to be independent of the load. The Cαmax is positively correlated with the liquid limit, indicating that the peak value that can be reached by the Cα is related to the maximum content of bound water in soft soil, thus the soil composition has a significant influence on secondary compressibility, which contributes to the prediction of long-term foundation deformation.

show abstract

Section: Relationship Between C αMax and Liquid Limitmentioning

confidence: 99%

Influence of Structure and Liquid Limit on the Secondary Compressibility of Soft Soils

Jiang

Wang

et al. 2020

JMSE

View full text Add to dashboard Cite

show abstract

Effect of the Number of Loading Cycles on the Behavior of a Stabilized Fiber-Reinforced Soft Soil: Energy Evaluation

Martins,

Correia,

Venda Oliveira

et al. 2023

J. Mater. Civ. Eng.

View full text Add to dashboard Cite

Unified Evaluation of Consolidation Parameters for Low to High Plastic Range of Cohesive Soils

State

Farooq

Mujtaba

et al. 2021

Mehran Univ. res. j. eng. technol.

View full text Add to dashboard Cite

Knowing the engineering properties of geomaterials is imperative to make the right decision while designing and executing any geotechnical project. For the economical and safe geotechnical design, quick characterization of the compressibility properties of the cohesive soil is often desirable; these properties are indeed tedious to determine through actual tests. Therefore, correlating the consolidation parameters of the soils with its index properties has a great significance in the geotechnical engineering field. Several attempts have been made in the past to develop correlations between the consolidation parameters and index properties of the cohesive soils, within certain limitations. However, there is still a need to develop such correlations based on the extensive database, composing of unified plasticity range of soils, i.e., low to high plasticity. In the current study, 148 undisturbed soil specimens were obtained from different areas of Pakistan. Out of which 120 samples were utilized to develop correlations, and 28 samples were used to check the validity of the developed correlations. In order to enhance the index properties database, 30 more bentonite mixed soil samples were prepared and tested accordingly. Correlations to envisage different consolidation parameters such as compression index, compression ratio and coefficient of volume compressibility were developed using 150 cohesive soil samples of low to high plasticity. In addition, the performance of these developed correlations was verified on a set of 40 soil samples and compared with the performance of different correlations available in the literature. The percentage deviation in the prediction of compressibility characteristics through developed correlations in the present study was found to be very less, which endorsed the excellent reliability of the developed correlations.

show abstract

Compressibility characteristics of a Portuguese soft deposit

Cited by 3 publications

References 1 publication

Influence of Structure and Liquid Limit on the Secondary Compressibility of Soft Soils

Influence of Structure and Liquid Limit on the Secondary Compressibility of Soft Soils

Effect of the Number of Loading Cycles on the Behavior of a Stabilized Fiber-Reinforced Soft Soil: Energy Evaluation

Unified Evaluation of Consolidation Parameters for Low to High Plastic Range of Cohesive Soils

Contact Info

Product

Resources

About