Radial consolidation characteristics of soft undisturbed clay based on large specimens

Baral, Pankaj; Rujikiatkamjorn, Cholachat; Indraratna, Buddhima; Kelly, Richard

doi:10.1016/j.jrmge.2018.06.002

Cited by 15 publications

(6 citation statements)

References 25 publications

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“…In actual field conditions, the disturbance can be more or less severe depending upon the soil type. Several experimental studies have stated the radial consolidation of clayey soil and the disturbance that surrounds the drain [7, [14][15][16][17][18]. If there is a concern about stability or if the soil is sensitive, remolding of the soil caused by PVD installation may not be tolerable.…”

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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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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“…Of these, vacuum preloading is one of the most popular and effective techniques practiced worldwide. Since first introduced by Kjellman, 1 vacuum preloading has been widely applied in ground improvement engineering, and the reinforcement mechanism of it has been studied extensively through in‐situ field tests and laboratory model tests 2–5,6 …”

Section: Introductionmentioning

confidence: 99%

“…Since first introduced by Kjellman, 1 vacuum preloading has been widely applied in ground improvement engineering, and the reinforcement mechanism of it has been studied extensively through in-situ field tests and laboratory model tests. [2][3][4][5]6 However, the performance of conventional vacuum preloading is not always satisfactory in every ground improvement project. Some limitations are gradually exposed with its extensive applications and such issues will lead to long consolidation time and excessive settlement after construction.…”

Section: Introductionmentioning

confidence: 99%

Analytical solutions for consolidation of soft soil improved by air‐boosted vacuum preloading considering clogging effect

Sun

2023

Num Anal Meth Geomechanics

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Air‐boosted vacuum preloading is a newly emerging soft soil‐improving technology and increasingly draws attention of researchers and engineers. However, few analytical theories are available in the literature to facilitate the design and calculation of it in practice. To fill this gap, an analytical model for the consolidation of soft ground improved by air‐boosted vacuum preloading is proposed based on the assumption of equal volumetric strain and Darcy's law. Moreover, a time‐dependent clogging effect is taken into consideration to describe the gradual reduction in the drainage capacity of prefabricated vertical drains (PVDs) during the consolidation process. In addition, the smear effect is also considered due to the installation of PVDs. An air booster pipe and the surrounding PVDs are introduced into the unit cell for analysis based on the principle of equal cross‐sectional area, and analytical solutions under two typical time‐dependent horizontal loading are then developed. A comparison is made with the existing analytical model of conventional vacuum consolidation, which indicates that air‐boosted vacuum preloading can promote the consolidation of soft soil more effectively than conventional vacuum preloading. Furthermore, the obtained solution under instantaneously loading is used to investigate the influence of several parameters on consolidation behavior. Finally, to verify the accuracy of the analytical model with or without clogging effect, a comparative study is carried out with a field test.

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“…The thickness and engineering characteristics of soft soil vary in different areas of different settling environments. Deep soft soil (thickness greater than 10m) is widely distributed in the southern part of Guangzhou due to its unique geographical location and complex stratigraphic conditions [5][6][7]. Land subsidence in soft soil has gradually become one of the main geological disasters in Guangzhou, which not only causes cracking and tilting of building structures, distortion of roads, deformation, and cracking of municipal pipes but also poses a threat to the safety of residents in soft soil construction areas.…”

Section: Introductionmentioning

confidence: 99%

Study on Microstructure and Silting Characteristics of Soft Soil: A Case Study of Nansha District, Guangzhou

et al. 2023

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With the development of society and economy, land subsidence in soft soil areas has become a prominent geological disaster in our country’s coastal area. Land subsidence has the characteristics of irreversibility, wide influence range, long aging, etc., and these characteristics are closely related to the characteristics of soft soil, such as physical and mechanical parameters, microstructure characteristics, etc. The Nansha District of Guangzhou was taken as the study area in this paper. Through the collection of preliminary data, two-dimensional scanning electron microscopy, and three-dimensional Computed Tomography (CT), the micro-structure characteristics of soft soil are expounded and its plugging characteristics are further analyzed. The results show that the study area’s soft soil has a honeycomb, granular, and flocculent structure. From the perspective of pore scale distribution, the number of macropores and ultramicro pores is small, and the continuity is poor. In most small and medium pores, namely the aggregate and granular pores. The siltation of soft soil is closely related to the microstructure of soil and can be treated according to the effect of siltation characteristics on the consolidation settlement of soft soil. The research results of this paper can provide targeted prevention and control suggestions for the soft land subsidence disaster in the Nansha area, and also provide a reference for other similar research.

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Radial consolidation characteristics of soft undisturbed clay based on large specimens

Cited by 15 publications

References 25 publications

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

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

Analytical solutions for consolidation of soft soil improved by air‐boosted vacuum preloading considering clogging effect

Study on Microstructure and Silting Characteristics of Soft Soil: A Case Study of Nansha District, Guangzhou

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