Determination of radial coefficient of consolidation using log &lt;i&gt;t&lt;/i&gt; method

Sridhar, G.; Robinson, R. G.

doi:10.3328/ijge.2011.05.04.373-381

Cited by 18 publications

(4 citation statements)

References 7 publications

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“…For a VD test, the log t and root t methods have been commonly recommended in handbooks and standards (e.g., ASTM D2435-09 [14]) and they are adopted herein. For a CD test, the log t method [39] and root t method [40,41] were also adopted for comparable analyses. In fact, log t method (or root t method) for vertical and radial drainage types (i.e., VD and CD tests) uses the same features of the time -settlement curves to derive c v and c r,CD , thus the coefficients from the same method are in principle comparable for the two drainage types.…”

Section: Coefficients Of Consolidation (C V and C R )mentioning

confidence: 99%

Compressibility characteristics of clays in the Red River Delta

Dũng

Khin

2023

STCE

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The Red River Delta (RRD) is the second largest delta in Vietnam and is a significant economic zone in the country, encompassing important cities and economic zones. Geologically, the delta consists of clay layers distributed all over its area, which strongly impact the foundation designs of the infrastructure system (e.g., highways, industrial parks, harbors). However, up to date, there were no comprehensive studies on the compressibility characteristics of the clays in the delta. This study presents a primary study on some compressibility characteristics of clays in the whole delta with an emphasis on the use of CPTu data in the interpretation. For this, high-quality field and laboratory test results obtained from four research test sites and eight project sites were analyzed to depict the characteristics. The results indicate that the clays in the delta are typically soft to medium stiff and normally consolidated to slightly overconsolidated, which represent typical characteristics of young Holocene deposits. The compression index (Cc) of the clays was found to have good correlations with natural water content (Wn) or in-situ void ratio (e0). The ratio of radial coefficient of consolidation from a consolidation test with a central drain (CD) to the vertical coefficient of consolidation from the standard consolidation test (i.e., cr,CD/cv) from the 4 research test sites is on average 2.76 (log t method) and 2.32 (root t method) and these average ratios are found typical for deltaic soil deposits. The correlations for the remolded samples indicate that the drainage type has a strong influence to the induced coefficients of homogeneously remolded soils. Results from this study help geotechnical engineers have a general view on the compressibility characteristics of the clays in the delta, which in turn helps secure optimal foundation design solutions.

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Section: Coefficients Of Consolidation (C V and C R )mentioning

confidence: 99%

Compressibility characteristics of clays in the Red River Delta

Dũng

Khin

2023

STCE

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“…Lõi có kích thước khác nhau tùy thuộc đường kính mẫu. Cụ thể: Mẫu có đường kính  = 61,8mm, đường kính lõi  l = 10mm; Mẫu có đường kính  = 79,8mm, đường kính lõi  l = 15mm [4][5][6][7]. Lõi được tạo bằng cát hạt trung, cấp phối hạt lấy theo Tiêu chuẩn quốc gia TCVN 11713:2017 [11].…”

Section: Bước 1-lấy Mẫu Vào Dao Vòng (Thực Hiện Như Phần Thí Nghiệm C...unclassified

Dự báo ảnh hưởng kích thước mẫu đất loại sét yếu đến kết quả thí nghiệm nén cố kết một trục không nở hông

Nguyễn,

Đỗ,

Lê

2023

Proceedings of the International Conference - 60 Years of IBST

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In Vietnam, soft clay soils commonly distributing in large plains are used as the different construction foundation such as road, dike etc. Then there often occurs high settlement deformation, affecting the stability of structure. The main reason is that the input soil mechanics still have limitations especially the settlement deformation properties. Particularly, the specimen size of unconfined compression test is not much paid attention. This paper presents the research results on the influence of specimen size on unconfined compression test for soft clay. The soft clay (semi-clay ambQ23tb in liquid state) distributed in the coastal area of Nam Dinh give general comments: In vertical consolidation tests: In both diameter classes (D), when The height (H) increases, the settlement index (Cc) decreases but the decrease is not significant only from 0.037 to 0.011). In both heights, when  increases, Cc increases, the increase is small, only from 0.007 to 0.033. When the sample size increases, the consolidation coefficient of soil Cv increases, the increase of Cv with the increase of H is very significant. Specifically: In both sizes , when H increases, Cv increases similarly, ranging from 84 to 311%. In both sizes H, when the diameter increased from 61.8 to 79.8mm, the Cv at all pressure levels (') increased, the increase was in the range of 12 to 89%. In the radial consolidation test: when  increased from 61,8 to 79,8mm, at all values of ', Cv increased but the increase was not large, only a few %; Ch value increased more than Cv, the increase ranged from 17 to 76%, the ratio Ch/Cv ranged from 2.28 to 2.83.

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“…Preloading with sand drains (SD), a method of improving soft soil, was first proposed around 1926 by an American engineer, Moran [19], to fasten the process of consolidation that happens predominantly under radial drainage. Extensive experimental studies have been performed to determine the radial consolidation behavior of soil using sand as a draining material [13,[20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Utilization of waste materials as a substitute for the sand drain in clayey soil

Aparna

Bindu²

2023

Geo-Engineering

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The practice of pre-compression with sand drains is a widely accepted soil stabilization method for improving soft soil deposits. The scarcity of quality sand contributed to the substitution of a more cost-effective material. An effort was made in the present investigation to utilize waste products like quarry dust (QD), coir pith (CP), fly ash (FA), and rice husk ash (RHA) as the vertical drain in clayey soils. A sand drain (SD) has been used for comparison purposes. Kuttand Clay (KC) and Cochin marine clay (CMC) was selected for the study. Tests were conducted on conventional oedometer cells with a diameter of 6 cm and a height of 2 cm using vertical and radial consolidation models. In addition, this paper demonstrated the effect of the density of drain on radial consolidation characteristics. From the analysis, it was observed that the rate of consolidation increases with the inclusion of any drain material. The radial coefficient of consolidation using sand, quarry dust, and coir pith drain shows a higher value when comparing with the other drain material, which can be owing to their high permeability. The present study can recommend that the quarry dust and coir pith drain, or maybe the combination can be a better alternative for the sand drain.

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Determination of radial coefficient of consolidation using log <i>t</i> method

Cited by 18 publications

References 7 publications

Compressibility characteristics of clays in the Red River Delta

Compressibility characteristics of clays in the Red River Delta

Dự báo ảnh hưởng kích thước mẫu đất loại sét yếu đến kết quả thí nghiệm nén cố kết một trục không nở hông

Utilization of waste materials as a substitute for the sand drain in clayey soil

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