Field evaluation of subgrade soils under dynamic loads using orthogonal earth pressure transducers

Subgrade soils experience repeated traffic loads, such that dynamic stress and displacement are accumulated to jeopardize the stability of pavement foundations. Laboratory element testing is often conducted to apply cyclic loads to the soil. In fact, the stress state of subgrade soil is complex due...

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Main Authors: Lin, Peiyuan, Tang, Liansheng, Ni, Pengpeng
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2021
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Online Access:https://hdl.handle.net/10356/151559
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1515592021-06-30T04:12:08Z Field evaluation of subgrade soils under dynamic loads using orthogonal earth pressure transducers Lin, Peiyuan Tang, Liansheng Ni, Pengpeng School of Civil and Environmental Engineering Engineering::Civil engineering Field Test Subgrade Soil Subgrade soils experience repeated traffic loads, such that dynamic stress and displacement are accumulated to jeopardize the stability of pavement foundations. Laboratory element testing is often conducted to apply cyclic loads to the soil. In fact, the stress state of subgrade soil is complex due to the constant rotation of principal stress induced by moving vehicles. It is hard to select constitutive relations for unsaturated subgrade soils in numerical or analytical calculation, since most models are developed without proper consideration of principal stress rotation. Furthermore, most available earth pressure sensors cannot provide stress measurements in three orthogonal directions for a soil element at the same time. A novel orthogonal earth pressure transducer is developed to measure dynamic stresses of subgrade soils in three directions under a roadway at Chencun, China. The cumulative effect of dynamic stress with load cycles is observed explicitly. Results indicate that the dynamic stress becomes negligible at 2 m from the roadway, and stabilization is suggested to be limited within this width. A series of constitutive relations is proposed to correlate the dynamic stress with the resulted displacement in different directions, which can be used to guide the design of unsaturated subgrade soils in South China. 2021-06-30T04:12:08Z 2021-06-30T04:12:08Z 2019 Journal Article Lin, P., Tang, L. & Ni, P. (2019). Field evaluation of subgrade soils under dynamic loads using orthogonal earth pressure transducers. Soil Dynamics and Earthquake Engineering, 121, 12-24. https://dx.doi.org/10.1016/j.soildyn.2019.03.001 0267-7261 https://hdl.handle.net/10356/151559 10.1016/j.soildyn.2019.03.001 121 12 24 en Soil Dynamics and Earthquake Engineering © 2019 Elsevier Ltd. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Civil engineering
Field Test
Subgrade Soil
spellingShingle Engineering::Civil engineering
Field Test
Subgrade Soil
Lin, Peiyuan
Tang, Liansheng
Ni, Pengpeng
Field evaluation of subgrade soils under dynamic loads using orthogonal earth pressure transducers
description Subgrade soils experience repeated traffic loads, such that dynamic stress and displacement are accumulated to jeopardize the stability of pavement foundations. Laboratory element testing is often conducted to apply cyclic loads to the soil. In fact, the stress state of subgrade soil is complex due to the constant rotation of principal stress induced by moving vehicles. It is hard to select constitutive relations for unsaturated subgrade soils in numerical or analytical calculation, since most models are developed without proper consideration of principal stress rotation. Furthermore, most available earth pressure sensors cannot provide stress measurements in three orthogonal directions for a soil element at the same time. A novel orthogonal earth pressure transducer is developed to measure dynamic stresses of subgrade soils in three directions under a roadway at Chencun, China. The cumulative effect of dynamic stress with load cycles is observed explicitly. Results indicate that the dynamic stress becomes negligible at 2 m from the roadway, and stabilization is suggested to be limited within this width. A series of constitutive relations is proposed to correlate the dynamic stress with the resulted displacement in different directions, which can be used to guide the design of unsaturated subgrade soils in South China.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Lin, Peiyuan
Tang, Liansheng
Ni, Pengpeng
format Article
author Lin, Peiyuan
Tang, Liansheng
Ni, Pengpeng
author_sort Lin, Peiyuan
title Field evaluation of subgrade soils under dynamic loads using orthogonal earth pressure transducers
title_short Field evaluation of subgrade soils under dynamic loads using orthogonal earth pressure transducers
title_full Field evaluation of subgrade soils under dynamic loads using orthogonal earth pressure transducers
title_fullStr Field evaluation of subgrade soils under dynamic loads using orthogonal earth pressure transducers
title_full_unstemmed Field evaluation of subgrade soils under dynamic loads using orthogonal earth pressure transducers
title_sort field evaluation of subgrade soils under dynamic loads using orthogonal earth pressure transducers
publishDate 2021
url https://hdl.handle.net/10356/151559
_version_ 1705151286686515200