Observational method for field performance of prefabricated vertical drains

Chung, S. G.; Kweon, H. J.; Jang, Woo Young

doi:10.1016/j.geotexmem.2014.06.005

Cited by 37 publications

(19 citation statements)

References 31 publications

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“…The settlement at a given time is measured and the ultimate consolidation settlement is predicted. As the soil properties are highly variable in the field, it is difficult to predict reliably the ultimate consolidation settlement using the e-log σ′ v as determined from one-dimensional oedometer tests (Holtz, 1987;Chung, 1999;Arulrajah et al, 2003Arulrajah et al, , 2004Bo et al, 2003;Chung et al, 2014). Thus, in practice, the observational method is usually adopted to use the field monitoring data to predict the ultimate settlement.…”

Section: Introductionmentioning

confidence: 99%

New observational method for prediction of one-dimensional consolidation settlement

Guo

Chu

2017

Géotechnique

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The Chapman–Richards model is adopted in this paper to best fit the Terzaghi's one-dimensional consolidation curve. The obtained formula fits the theoretical solution well, with a regression coefficient R2 of 0·9995 and an error of less than 2%. By adopting this model, a new method to predict the ultimate settlement and the coefficient of consolidation using monitoring settlement data is proposed. The accuracy of the proposed method is verified against oedometer test and field monitoring data. For the cases verified, the ultimate settlement predictions from the proposed method are more reliable than those from the Asaoka's method for the different range of settlement data.

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Section: Introductionmentioning

confidence: 99%

New observational method for prediction of one-dimensional consolidation settlement

Guo

Chu

2017

Géotechnique

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“…According to Bourge`s-Gastaud, Blond, and Touze-Foltz (2013), Tripathi and Nagesha (2010), it is considered the most critical parameter in vertical drainage design and performance. Furthermore, Chung, Kweon, and Jang (2014) stated that the inaccurate estimation of consolidation rate is due to the incorrect input of discharge capacity value. Discharge capacity and the hydraulic gradient are defined in Equations ( 1) and (2).…”

Section: Discharge Capacitymentioning

confidence: 99%

Effect of Well Resistance on Time Factor Ratio Due to PVD Deformation

Chrismaningwang

Hardiyatmo

Adi

et al. 2021

Journal of the Civil Engineering Forum

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One of the most common soft soil enhancement techniques used to expedite the consolidation time significantly is Prefabricated Vertical Drains (PVD). This technique needs a sufficient discharge capacity value because it primarily functions as a drainage channel. The deformation of PVD is considered as one of the primary factors which affect discharge capacity. Therefore, this research determined the influence of upper-side deformation on PVD's discharge capacity (qw) using a specific design apparatus known as ASTM D4716, which manages the determination of transmissivity and flow rate at the longitudinal direction of geosynthetics. Furthermore, two PVD samples with dimensions of 3 and 4 mm thickness, 100 mm width, and 1000 mm length were examined under straight and buckled conditions. Stepwise confining pressures from 50 to 200 kPa were subjected to the samples under hydraulic gradients with values of 0.2, 0.5, and 1.0. The results showed that samples with greater thickness had higher discharge capacity, which significantly reduced in the lower hydraulic gradient. The deformation on the upper side of PVD induced a decrease of discharge capacity by approximately 13-16%, which led to a delay in the consolidation time. The discharge capacity values obtained from the experiments were employed as parameters in a time factor ratio of Th,w/Th. The analysis results show that the buckled PVD has a more considerable consolidation time due to the increase in the Th,w/Th ratio, with a discharge capacity value below 10-4 m3/s. It can be concluded that the deformation in the form of buckled conditions on the upper side of PVD had a considerable impact on PVD effectiveness.

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“…Surcharge preloading requires a large amount of materials and higher transportation and construction costs than some other methods [8]. In addition, excessive loading may increase the shear stress, which may lead to shear failure of the foundation [9]. Considering the shortcomings of the abovementioned reinforcement methods, new alternatives must be urgently explored.…”

Section: Introductionmentioning

confidence: 99%

Two‐Dimensional Electroosmotic Consolidation Theory of Nonlinear Soil Voltage Distribution Characteristics

Shen

Feng

et al. 2019

Advances in Civil Engineering

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Soil voltage is generally assumed to show a linear relationship with distance from the cathode according to the established electroosmotic consolidation equation. However, this assumption is inconsistent with experimental results. To more reasonably reflect the soil consolidation process during electroosmosis treatment, it is necessary to consider the influence of the actual soil voltage distribution trend when establishing the electroosmotic consolidation equation. Electroosmosis results show that soil voltage exhibits nonlinear distribution characteristics against distance from the cathode. The change trend of soil voltage can be well reflected by cubic polynomial fitting. Then, the anodic electrode was taken as the research object, and a two-dimensional horizontal plane model of electroosmosis was established because it represents practical electroosmosis applications more closely than some other models. Based on this established model, the dissipation equation describing the excess pore water pressure and the soil consolidation equation were derived for the electroosmosis treatment process. The derivation process considered both linear and nonlinear soil voltage distributions, wherein the anode was closed and the cathode was open. Finally, the analytical solution was analyzed and validated with model test cases in terms of the excess pore water pressure and average moisture content of the soil. The trend observed in the measured excess pore water pressure was more consistent with that of the theoretical results calculated assuming a nonlinear soil voltage distribution than that obtained using a linear distribution. In addition, the measured values of the average moisture content in the soil were closer to the values calculated under a nonlinear distribution of soil voltage than to those calculated under a linear distribution. These results further show that the established consolidation equation is reasonable when a nonlinear distribution of soil voltage is considered. The proposed consolidation equation can thus improve the application of electroosmotic methods in the future.

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Observational method for field performance of prefabricated vertical drains

Cited by 37 publications

References 31 publications

New observational method for prediction of one-dimensional consolidation settlement

New observational method for prediction of one-dimensional consolidation settlement

Effect of Well Resistance on Time Factor Ratio Due to PVD Deformation

Two‐Dimensional Electroosmotic Consolidation Theory of Nonlinear Soil Voltage Distribution Characteristics

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