Subsurface characterization of a construction site in Nanjing, China using ERT and CPTU methods

Liu, Xuening; Shen, Jirong; Yang, Ming; Cai, Guojun; Liu, Songyu

doi:10.1016/j.enggeo.2022.106563

Cited by 13 publications

(4 citation statements)

References 28 publications

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“…Recently, with the processive development of new directions and demands in geotechnical engineering, especially marine geotechnical engineering, many international research institutions (e.g., University of British Columbia, Georgia Institute of Technology, Delft University, and Southeast University) and professional in situ test instrument development companies (e.g., Hogentogler, Vertek, ConeTec, and Furgo Corporation) have developed new sensors for CPTU. These new CPTU sensors promote the CPTU test method to develop in the direction of multi-functionality [10,[19][20][21][22][23][24], which further broadens the application field of the CPTU. Figure 1 shows a schematic diagram of the internal structure of a common CPTU.…”

Section: Introductionmentioning

confidence: 99%

The Practice and Development of T-Bar Penetrometer Tests in Offshore Engineering Investigation: A Comprehensive Review

Qiao

Liu

et al. 2023

JMSE

Self Cite

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In recent years, the development of marine hydrocarbon resources has led to an increased demand for research on the marine soil bearing capacity and cyclic loading effect in marine engineering design. Because of the difficulties and high costs involved in obtaining high-quality soil samples from offshore sites, in situ testing techniques have become the preferred method of determining design parameters in offshore geotechnical engineering projects. This paper provides a review of the current state of marine penetrometer deployment technology used in offshore engineering investigations and presents a summary of the T-bar penetrometer test for measuring marine soft clay. The existing literature research on penetration mechanisms, numerical simulations, laboratory experiments, and field tests of the T-bar penetrometer in the field of marine geotechnical engineering are analyzed. Finally, the potential difficulties, challenges, and prospects of the T-bar penetrometer tests are discussed.

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Section: Introductionmentioning

confidence: 99%

The Practice and Development of T-Bar Penetrometer Tests in Offshore Engineering Investigation: A Comprehensive Review

Qiao

Liu

et al. 2023

JMSE

Self Cite

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“…Compared to the traditional SPT, CPTUs have significant advantages, such as providing continuous testing data and suitability for more complex environmental conditions; as a result, they are extensively utilized in marine geotechnical surveys. However, existing empirical formulae relating CPTU results to soil parameters are primarily based on terrestrial environments [7,8] and are unsuitable for marine conditions [9]. Therefore, it is of great importance to conduct in-depth research on the empirical formulae connecting CPTU results and marine soil parameters.…”

Section: Introductionmentioning

confidence: 99%

A Novel Method for Estimating the Undrained Shear Strength of Marine Soil Based on CPTU Tests

Fu,

Shen,

Jia

et al. 2024

JMSE

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The undrained shear strength is an essential parameter in the foundation design of marine structures. Due to the complex marine environment and technical limitations, it is difficult and costly to obtain offshore samples. Piezocone penetration tests (CPTU) are relatively low-cost compared to drilling and sampling methods. Therefore, based on the soil behavior type index (Ic) derived from CPTU results, a model for estimating cone factors (Nkt, Nke) is proposed to improve the accuracy of estimation of undrained shear strength. The result shows that the soil behavior type index (Ic) and cone factors take on a negatively correlated exponential relation. Incorporating a cone factor that varies with the soil behavior type index (Ic) significantly enhances the accuracy of undrained shear strength predictions compared to the conventional method of using a constant cone factor. This approach reduces the root mean square error (RMSE) for Nkt (Nke) from 0.124 (0.126) MPa to 0.056 (0.06) MPa, and the mean absolute error (MAE) from 0.0154 (0.016) MPa to 0.0032 (0.0036) MPa. The method was validated at an additional location and the predictions were in high agreement with the results of the consolidated quick direct shear test. The developed method can serve as an effective tool used in the design of foundations of marine structures.

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“…A borehole coring permeability coefficient test is still the most commonly used testing method to determine permeability [27,28]. However, excavation and core drilling cause man-made damage to the wall, and increasingly less non-destructive testing methods are also used in the detection of wall quality [29][30][31][32]. Modoni et al [33] analyzed the quality of jet grouting with single-fluid and double-fluid jet grouting, and different grouting components and injection parameters through the indoor test of sample coring.…”

Section: Introductionmentioning

confidence: 99%

Study on the Construction Method and Effects of Ipsilateral, Multi-Nozzle, High-Pressure Jet Grouting Cut-Off Wall

Xie

Gao

et al. 2022

Sustainability

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High-pressure jet grouting is widely used in the construction of cut-off wall in hydraulic engineering. Compared to the high-pressure jet grouting used for foundation improvement, the high-pressure jet grouting cut-off wall of hydraulic engineering has lower requirements for the advance consolidation and provision of bearing capacity, and more focus on providing an anti-seepage effect and ensuring the continuous integrity of the wall. In the past, the research on high-pressure jet grouting focused more on the application to foundation treatments, and the research on the construction efficiency of cut-off wall is relatively insufficient. Therefore, in this study, a self-developed ipsilateral multi-nozzle jet grouting machine with a large drill diameter and construction method are proposed according to the construction characteristics of the embankment cut-off wall in hydraulic engineering. Based on the dyke protection projects, Jinggangshan navigation hydropower and Xingan navigation hydropower, the large-diameter, multi-nozzle, high-pressure jet cut-off wall test is carried out, and the wall forming effect of the cut-off wall is verified through the combination of indoor and outdoor tests. The results show that the proposed construction method can adapt to the formation conditions in which it is difficult to implement conventional high-pressure jet grouting, and obtains good construction efficiency. A favorable wall quality can be obtained by using more efficient large-diameter and ipsilateral multi-nozzle jet grouting in the construction of high-pressure jet cut-off wall.

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Subsurface characterization of a construction site in Nanjing, China using ERT and CPTU methods

Cited by 13 publications

References 28 publications

The Practice and Development of T-Bar Penetrometer Tests in Offshore Engineering Investigation: A Comprehensive Review

The Practice and Development of T-Bar Penetrometer Tests in Offshore Engineering Investigation: A Comprehensive Review

A Novel Method for Estimating the Undrained Shear Strength of Marine Soil Based on CPTU Tests

Study on the Construction Method and Effects of Ipsilateral, Multi-Nozzle, High-Pressure Jet Grouting Cut-Off Wall

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