Field Measurements and Numerical Simulations of Temperature and Moisture in Highway Engineering Using a Frequency Domain Reflectometry Sensor

Yao, Yongsheng; Zheng, Jian-Long; Chen, Zeng-Shun; Zhang, Junhui; Li, Yong

doi:10.3390/s16060857

Cited by 19 publications

(13 citation statements)

References 34 publications

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“…is study was being performed to investigate the moisture migration of the new embankment, and the best combination method to keep the volumetric moisture content stability was found. e VADOSE/W module of the Geo-Studio 2007 Software (GEOSLOPE International Ltd., Canada) [23] was used to calculate the water infiltration into two layers of soils with contrasting particle sizes.…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…Hatami et al [22] investigated the seasonal change of the humidity field of embankments. Yao et al [23] found that the volumetric moisture content of the new embankment increases significantly through FDR sensors and simulation. However, they only thought that the increase in the humidity of the new embankment was due to the moisture migration between the embankment and the surrounding atmosphere.…”

Section: Introductionmentioning

confidence: 99%

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Moisture Migration and Control of New Embankment for Reconstruction and Expansion Project in Southern China

Zhang

Zeng

et al. 2020

Advances in Civil Engineering

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In hot and humid regions of southern China, the volumetric moisture content of the embankment after opening to traffic for a period of time reaches a stable state, and it is higher than the design value. When it was widened, the humidity gradient and exchange were formed due to the difference in moisture content between the existing and new embankment. To reveal the moisture migration of the existing and new embankment and control the rise of volumetric moisture content in new embankment, six frequency domain reflectometry sensors were installed in existing and new embankment to monitor the volumetric moisture content. A finite element model for the embankment was established and verified with the measured data. And seven numerical analyses of transient seepage in the new embankment of the cushion, cover, and partition using capillary barrier by sand were simulated. The results show that the volumetric moisture contents of the new embankment in southern China gradually increase and eventually reach an equilibrium state. The increase in water comes from the slope, the foundation, and the existing embankment. Early in the first 1∼2 years, the water mainly comes from the foundation and the existing embankment. After that, as time goes by, the water comes mostly from the slope infiltration and gradually migrates to the foundation and the existing embankment. Finally, the volumetric moisture content and the water storage gradually reach equilibrium. The volumetric moisture content of the new embankment using capillary barrier by sand at the cushion, the cover, and the partition is maintained as the construction volumetric moisture content. This combination is a very effective method to control the humidity stability of the new embankment in southern China.

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Section: Numerical Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Moisture Migration and Control of New Embankment for Reconstruction and Expansion Project in Southern China

Zhang

Zeng

et al. 2020

Advances in Civil Engineering

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“…erefore, a rapid method to determine the water content is the key to calculate the degree of compaction using (1). e water content of subgrade slope soil can be calculated using the numerical simulation, which is proved to be rational by some researchers using the Geo-Studio software [22][23][24][25].…”

Section: Degree Of Compaction According To Numerical Moisture Contentmentioning

confidence: 99%

“…en, a numerical modelling of the subgrade slope of K24 + 600 was completed according to the method of the literature [22,26,27]. Water content was calculated using the parameters mentioned above, and the results of calculated water content values of soil are shown in Figure 9.…”

Section: Calculated and Measured Water Content Valuesmentioning

confidence: 99%

Measurement of Degree of Compaction of Fine-Grained Soil Subgrade Using Light Dynamic Penetrometer

Zhang

Yao

Huang

et al. 2018

Advances in Civil Engineering

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To determine the degree of compaction of subgrades filled with fine-grained soil, the compaction test and light dynamic penetrometer (LDP) test were carried out for low liquid-limit clay samples with different water contents in laboratory. Then, a prediction equation of the penetration ratio (PR) defined as the depth per drop of the hammer of LDP, degree of compaction (K), and water content (ω) was built. After that, the existing fine-grained soil subgrades on LDP-based field tests were excavated. The on-site PR values, water contents, and degrees of compaction of slopes were obtained. The estimated degrees of compaction using the prediction equation were compared with measured values of the degree of compaction in field. The results show that there is good consistency between them, and an error within 3.5% was obtained. In addition, the water content should be determined firstly while using the prediction equation which is proposed in this study. Therefore, a numerical method of the water content of a subgrade was developed, and the predicted and measured water contents were compared, which shows a relatively high relativity. Then, the degree of compaction of fine-grained soil subgrades can be calculated according to the predicting equation, which involves the penetration ratio (PR) and the numerically calculated water content as input instead of the measured value in the field.

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“…Zum Wasserhaushalt von Straßendämmen lagen bis dato nur vergleichsweise wenige Ergebnisse experimenteller Untersuchungen vor. Diese beschäftigten sich in erster Linie mit der Entwicklung von Wassergehalten in Straßendämmen ohne die Sickerwassermengen zu erfassen und zu quantifizieren . Zur gezielten Analyse des Wasserhaushalts von Straßenböschungen wurden deshalb bei der Bundesanstalt für Straßenwesen (BASt) Lysimeteruntersuchungen an Ausschnitten von Straßendämmen durchgeführt.…”

Section: Introductionunclassified

Modellierung des Wasserhaushalts von Straßenböschungen in Lysimetern

2020

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Zur Ermittlung des Wasserhaushalts von ungesättigten Erdbauwerken wurden bei der Bundesanstalt für Straßenwesen (BASt) Lysimeteruntersuchungen unter Laborbedingungen durchgeführt. Dazu wurden Böschungsausschnitte mit kiesigem und bindigem Boden, Hausmüllverbrennungsasche, Recycling‐Materialien und industriellen Nebenprodukten errichtet. Die Lysimeter wurden mit unterschiedlichen Intensitäten beregnet und Sickerwasser sowie Zwischen‐ und Oberflächenabfluss quantifiziert. So werden typische, mit natürlichen Dammschüttmaterialien und mineralischen Ersatzbaustoffen errichtete Straßenböschungen abgebildet. Zudem wurden auch Bauweisen untersucht, bei denen in Anlehnung an das Merkblatt für Technische Sicherungsmaßnahmen im Erdbau oberhalb des Dammschüttmaterials zur Ableitung des eindringenden Sickerwassers eine Dränmatte angeordnet wurde. Unter Verwendung der vorab experimentell ermittelten hydraulischen Eigenschaften der verschiedenen Materialien wurde der Wasserhaushalt der Lysimeter mit einer Finite‐Elemente‐Software numerisch nachgerechnet. Diese Ergebnisse zeigten eine gute Übereinstimmung mit den Messungen. Sensitivitätsanalysen zeigten, dass oberflächennahe Schichten im Modell einen großen Einfluss auf den gesamten Wasserhaushalt haben. Außerdem wurde sowohl experimentell als auch rechnerisch festgestellt, dass eine Dränmatte über grobkörnigem Material die Wirkung einer Kapillarsperre hat und die in den Dammbaustoff eindringende Sickerwassermenge signifikant reduziert.

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Field Measurements and Numerical Simulations of Temperature and Moisture in Highway Engineering Using a Frequency Domain Reflectometry Sensor

Cited by 19 publications

References 34 publications

Moisture Migration and Control of New Embankment for Reconstruction and Expansion Project in Southern China

Moisture Migration and Control of New Embankment for Reconstruction and Expansion Project in Southern China

Measurement of Degree of Compaction of Fine-Grained Soil Subgrade Using Light Dynamic Penetrometer

Modellierung des Wasserhaushalts von Straßenböschungen in Lysimetern

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