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Experimental and Numerical Study of ...

Kermani, Behnoud.

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Experimental and Numerical Study of Subgrade Soil Migration into Pavement Subbase and Mitigation Using Geotextile.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Experimental and Numerical Study of Subgrade Soil Migration into Pavement Subbase and Mitigation Using Geotextile./
作者:	Kermani, Behnoud.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
面頁冊數:	319 p.
附註:	Source: Dissertation Abstracts International, Volume: 79-12(E), Section: B.
Contained By:	Dissertation Abstracts International79-12B(E).
標題:	Civil engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10903692
ISBN:	9780438135178

Experimental and Numerical Study of Subgrade Soil Migration into Pavement Subbase and Mitigation Using Geotextile.
Kermani, Behnoud.

Experimental and Numerical Study of Subgrade Soil Migration into Pavement Subbase and Mitigation Using Geotextile. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 319 p.

Source: Dissertation Abstracts International, Volume: 79-12(E), Section: B.

Thesis (Ph.D.)--The Pennsylvania State University, 2018.

Particle transport and its subsequent deposition in porous media play a significant role in the performance of civil infrastructure such as pavements. Pavement structure typically consists of an asphalt concrete or concrete surface layer, underlying granular layers (subbase and/or base), and a compacted subgrade soil layer. As the subgrade is saturated during wet seasons, cyclic loading caused by heavy traffic may lead to pumping of fine particles from the subgrade into the granular layers. Additionally, in rigid pavements, the repeated traffic loading may also result in redistribution of materials underneath the slabs, which contributes to faulting of rigid pavement slabs. Pumping of fines negatively impacts the performance and service life of the pavement and ultimately may lead to failure. The main objectives of this research are to (1) investigate occurrence of migration of fines and simulate and quantify the magnitude and rate of such migration in both flexible and rigid pavements and for different classes of roadways, (2) evaluate the effectiveness of geotextiles as a separation and filtration layer in preventing subgrade fines migration, and (3) understand the mechanisms of fines migration in pavement and provide a reasonable prediction of the amount of fines migration using a numerical model on particle transport in porous media.

ISBN: 9780438135178Subjects--Topical Terms:

860360
Civil engineering.

Experimental and Numerical Study of Subgrade Soil Migration into Pavement Subbase and Mitigation Using Geotextile.
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245 1 0 $a Experimental and Numerical Study of Subgrade Soil Migration into Pavement Subbase and Mitigation Using Geotextile.
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300 $a 319 p.
500 $a Source: Dissertation Abstracts International, Volume: 79-12(E), Section: B.
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520 $a Particle transport and its subsequent deposition in porous media play a significant role in the performance of civil infrastructure such as pavements. Pavement structure typically consists of an asphalt concrete or concrete surface layer, underlying granular layers (subbase and/or base), and a compacted subgrade soil layer. As the subgrade is saturated during wet seasons, cyclic loading caused by heavy traffic may lead to pumping of fine particles from the subgrade into the granular layers. Additionally, in rigid pavements, the repeated traffic loading may also result in redistribution of materials underneath the slabs, which contributes to faulting of rigid pavement slabs. Pumping of fines negatively impacts the performance and service life of the pavement and ultimately may lead to failure. The main objectives of this research are to (1) investigate occurrence of migration of fines and simulate and quantify the magnitude and rate of such migration in both flexible and rigid pavements and for different classes of roadways, (2) evaluate the effectiveness of geotextiles as a separation and filtration layer in preventing subgrade fines migration, and (3) understand the mechanisms of fines migration in pavement and provide a reasonable prediction of the amount of fines migration using a numerical model on particle transport in porous media.
520 $a The cyclic traffic loading is simulated on geometrically-scaled models of flexible and rigid pavements representing a typical collector road and interstate highways using a one-third-scale Model Mobile Load Simulator (MMLS3), an accelerated pavement testing (APT) device. The pavement sections are constructed on partially saturated aggregate subbase overlying non-plastic saturated silt as subgrade. To evaluate the effectiveness of geotextile separation and filtration in reducing subgrade fines migration, identical tests simulating flexible collector road and rigid interstate highway are repeated, except that a geotextile layer is placed at the interface of subgrade and subbase layers. The results obtained from the tests with and without geotextile separator layer are then compared. The lab testing reveals that, under repeated traffic loading, a significant amount of fines migrated into the subbase. More migration occurs in the simulated collector road than in the interstate highway. The subgrade fines migration in mass percentage increases with the simulated traffic loading cycles. The resulting gradation of subbase also varies with the depth in the subbase, with more fines deposited in the lower section (closer to the subgrade) than in the upper section of the subbase. In the jointed rigid pavement, more fines accumulated in the subbase beneath the approach slab than beneath the leave slab, confirming that migration of fines counter to the direction of traffic occurs when the load moves to the leave slab. A geotextile separation layer at the subgrade-subbase interface can be used as an effective means to reduce pumping of subgrade fines in pavement by providing both separation and filtration.
520 $a Finally, a numerical model is formulated to understand the mechanisms of particle transport in pavement and to provide a reasonable prediction of the amount of fines migration in pavement. The model is verified using the results from the scaled pavement testing conducted on flexible pavements to quantify the magnitude and rate of subgrade fines migration. The numerical study suggests that the deposition of the subgrade soil into subbase is governed by hydraulic condition, grain size of subgrade, grain size and pore size of subbase, permeability of subbase, and viscosity of pore fluid in the subbase. Moreover, magnitude and duration of applied load play a leading role in the amount of pumping in pavement, as also revealed in the experimental study.
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