Distributed testing of soil-structure systems using web-based applications

Madabhushi, Spg; Haigh, Susan; Ali, Asghar; Williams, Michelle A.; Ojaghi, Mobin; Lamata, I.; Blakeborough, T.; Dietz, Martin

doi:10.1201/b10554-59

Cited by 5 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Many researchers have studied AGF and its effects on soil properties and mechanical behavior of frozen soils [20][21][22][23][24][25][26][27][28][29]. However, compared with unfrozen soils a greater effort is required to study frozen soils [30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Mechanical Behavior of Frozen Soils - A Case Study of Tabriz Subway

Esmaeili‐Falak

Katebi

2017

Period. Polytech. Civil Eng.

View full text Add to dashboard Cite

The mechanical properties of frozen ground are key parameters in design and implementation of artificial ground freezing (AGF) in underground projects. Soil samples were obtained from the urban underground railway project site in Tabriz, Iran. The specimens were classified as SP and CL according to the USCS. The specimens were remolded in accordance with the site conditions. Over 120 triaxial compression tests were conducted on the frozen samples at different temperatures, confining pressures and strain rates. The results show that the frozen SP and CL soils exhibit strain-softening and strain-hardening behaviour, respectively. In all cases, Young's modulus increases with decreasing temperature and increasing strain rate and confining pressure. Also, the shear strength increases with decreasing temperature and increasing strain rate. In all tests, the Young's modulus and shear strength of the SP soil are greater than the CL soil. Based on the results of this research, the application of artificial ground freezing was recommended for coarse-grained and non-cohesive soils like SP in the Tabriz underground railway project.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Mechanical Behavior of Frozen Soils - A Case Study of Tabriz Subway

Esmaeili‐Falak

Katebi

2017

Period. Polytech. Civil Eng.

View full text Add to dashboard Cite

show abstract

“…As cited by Jessberger (Pimentel et al 2010), the formation of the frozen barrier may be hindered by a high groundwater velocity. High velocity of groundwater flow can create ice erosion and result in thawing of a frozen barrier.…”

Section: Disadvantages With Frozen Barriersmentioning

confidence: 96%

Using frozen barriers for containment of contaminants

Wagner¹,

Yarmak²

2017

View full text Add to dashboard Cite

In the summer of 2011, a full-scale test of a frozen soil barrier was deployed at the Cold Regions Research and Engineering Laboratory site in Fairbanks, AK. Hybrid thermosyphons, a more efficient cooling technology than conventional ground freezing, were used to create the frozen soil. The hybrid units were actively cooled by a 4.5 kilowatt refrigeration condensing unit for 62 days. A vertical frozen barrier of 9 meters (m) extending from a depth of 7 m below the surface to the ground surface was completed in 42 days, and the barrier was 1 m thick in 48 days. This frozen barrier installation has successfully shown that this technology can freeze the ground quickly. At the end of winter 2012, the barrier was approximately 3.8 m thick. This barrier thickness was maintained throughout the summer of 2012. The results showed only the top 0.5 m thawed even though the system was inactive for approximately a year. A cost analysis was performed to compare the cost of frozen barriers and slurry walls. It was concluded that construction and operating and maintenance costs of frozen barriers are on par with other barrier systems. DISCLAIMER: The contents of this report are not to be used for advertising, publication, or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. All product names and trademarks cited are the property of their respective owners. The findings of this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents.

show abstract

“…Sres et al (2005) conducted an experiment to investigate the effect of low seepage velocity on the thermal distribution of soil surrounding a freezing pipe. A more significant effect of higher flow rate was observed in a larger-scale experiment conducted by Pimentel et al (2010) and Huang et al (2013). They focused on the temperature change during freezing that was measured by using multiple thermocouple sensors, which only provide temperature data at several designated points and do not give comprehensive thermal distribution.…”

Section: Generalmentioning

confidence: 99%

“…However, this assumption is inappropriate for our result and has to be proven by further investigation. Pimentel et al (2010) reported that water flow could be stopped with a longer freezing duration despite a high water flow velocity expected to be larger than the critical value. In the present tests, Test B1 was conducted in less than 30 h and Test B2 in about 35 h, which were relatively short compared with Pimental et al's experiments.…”

Section: Freezing Of Specimen With Initial Steady Flow Conditionmentioning

confidence: 99%

Experimental Investigation on Effects of Water Flow to Freezing Sand around Vertically Buried Freezing Pipe

2019

View full text Add to dashboard Cite

High groundwater flow velocity is a major challenge in many artificial ground freezing (AGF) projects, especially in groundwater control projects. That condition may be unfavorable for the formation of a frozen body. This study aims to understand the effect of seepage flow on the heat transfer behavior and hydraulic conductivity variation of sand during the freezing process in AGF projects by using a vertically buried freezing pipe. The authors conducted a small-scale laboratory experiment that combined a flow test, freezing process, and infrared thermograph observations of thermal distribution. The authors prepared saturated Toyoura sand and a Toyoura-silica sand layer combination as the heat-transfer medium. The thermal distribution and hydraulic conductivity behavior were investigated by two series of freezing experiments with different sand layers and flow scenarios. Infrared thermograph observation results showed how water affects the thermal distribution characteristic, whereas flow test results showed the relation between hydraulic conductivity and frozen-body development.

show abstract

Distributed testing of soil-structure systems using web-based applications

Cited by 5 publications

References 0 publications

Experimental Study of the Mechanical Behavior of Frozen Soils - A Case Study of Tabriz Subway

Experimental Study of the Mechanical Behavior of Frozen Soils - A Case Study of Tabriz Subway

Using frozen barriers for containment of contaminants

Experimental Investigation on Effects of Water Flow to Freezing Sand around Vertically Buried Freezing Pipe

Contact Info

Product

Resources

About