Remediation Engineering

Suthersan, Suthan; McDonough, Jeff

doi:10.1201/9781420050585

Cited by 59 publications

(55 citation statements)

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“…wP: plastic limit; direction normal to the minimum principal stress, following the path of least resistance (Suthersan, 1996;Alfaro and Wong, 2001). Therefore, the propagation orientation would point to the 45° angle to the vertical direction if the lateral stress of the layers is equal to the vertical stress.…”

Section: Site Descriptionmentioning

confidence: 99%

An in-situ slurry fracturing test for slurry shield tunneling

Liu

Yuan

2014

J. Zhejiang Univ. Sci. A

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When performing a slurry shield excavation in the shallow earth cover under a waterway, the support pressure is difficult to calibrate. If not carefully monitored, slurry fracturing or even slurry breakout can occur; water from the river can rush into the slurry circulating system, threatening the security of the project. In this study, an in-situ slurry fracturing apparatus was created to analyze the phenomena of slurry fracturing and fracture propagation. First, the fracturing test procedures and the method of identifying slurry fracturing are introduced. Then, mechanical models of the slurry fracturing and fracture propagation are described and validated with in-situ tests. The models provide fairly good predictions: the driving pressure is related to the properties of both the soil and slurry. Slurry with large parameters for bulk density and viscosity is beneficial for preventing slurry fracturing propagation. However, such parameters have little influence and can be neglected when determining the initial fracturing pressure. Preventing slurry fracturing and breakout is important for not only shield tunnel preparation, but also shield tunneling under dangerous conditions. A crucial factor is setting and limiting the maximum support pressure values. These pressures can be obtained through the in-situ tests and mechanical models described here. These results provide useful references for the Weisan Road Tunnel to be built under the Yangtze River in Nanjing, China.

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Section: Site Descriptionmentioning

confidence: 99%

An in-situ slurry fracturing test for slurry shield tunneling

Liu

Yuan

2014

J. Zhejiang Univ. Sci. A

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“…Another method used to enhance several remediation technologies, potentially applicable to air sparging, is the use of direct electric current (DC) or alternating electric current (AC) in saturated soils (Suthersan, 1999). The use of DC and AC can potentially help enhance air sparging.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Study of the Effect of Electromagnetic Waves on Airflow during Air Sparging

Najafi

Bolvardi

Farid

et al. 2014

Geo-Congress 2014 Technical Papers

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Air sparging is a technique that uses the injection of a gas (e.g., air, oxygen) into the subsurface to remediate saturated soils and groundwater contaminated with volatile organic compounds (VOCs). During air sparging, air or oxygen is injected into the subsurface below the lowest known depth of chemical contamination. The injected air will rise through the contaminated zones by buoyancy. Contaminant removal efficiency and air sparging performance are highly dependent on the pattern and type of airflow. Airflow, however, suffers from air channel formation (i.e., preferential paths for airflow), limiting remediation to smaller contaminated zones. This paper presents the results of experimental work investigating the possibility of controlling and improving airflow patterns through a saturated glass-bead medium using electromagnetic (EM) waves to enhance air sparging. The test setup consists of a resonant cavity made of an acrylic tank covered with transparent, electrically conductive films. Experimental measurement of the electric field component of EM waves is performed at different frequencies. Airflow pattern is also studied at different air-injection pressure levels with/without EM stimulation. The zone of influence (ZOI) during air sparging is monitored using digital imaging. A quantitative approach is then taken to correlate the characteristics of EM waves and airflow patterns.

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“…Segundo Suthersan (1997) há várias formas dessa agitação da água subterrânea ocorrer durante a injeção de ar como, por exemplo: A agitação por deslocamento físico ocorre durante a fase instável do processo, onde a porcentagem de saturação de ar varia com o tempo (SUTHERSAN, 1997).…”

Section: Agitação Da áGua Subterrâneaunclassified

“…Segundo Suthersan (1997) O transporte de massa na zona saturada e as taxas e mecanismos de remoção são muito similares ao do método convencional, exceto pelas trincheiras. Essas trincheiras são compostas por cascalho com grãos pequenos e arredondados.…”

Section: Considerações Do Métodounclassified

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Estudo do fluxo de ar em solos usando a técnica de injeção de ar em modelos físicos bidimensionais.

Scussiato¹

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Remediation Engineering

Cited by 59 publications

References 0 publications

An in-situ slurry fracturing test for slurry shield tunneling

An in-situ slurry fracturing test for slurry shield tunneling

Laboratory Study of the Effect of Electromagnetic Waves on Airflow during Air Sparging

Estudo do fluxo de ar em solos usando a técnica de injeção de ar em modelos físicos bidimensionais.

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