Development and preliminary application of a plate loading model test system considering stress state

Zhu, Changqi; Wang, Xing; Ming-jian, HU; Wang, Xinzhi; Shen, Jing; Jiang, Kaifang

doi:10.1016/j.measurement.2021.109507

Cited by 3 publications

(1 citation statement)

References 35 publications

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“…Nozomu et al (2018) conducted a series of direct shear tests with plastic bearing plates of different sizes and stiffness to evaluate the influence of size and stiffness on shear strength. Zhu et al (2021) applied a uniform load to the top surface of the subgrade with the help of a flexible airbag. The research results showed that the subgrade's bearing capacity and deformation modulus tested with the flexible bearing plate was greater than those tested with the rigid bearing plate.…”

Section: Introductionmentioning

confidence: 99%

A flexible bearing plate based on steel plate and rubber mat

2023

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The bearing plates used in plate load test for highway engineering are typically rigid. However, due to limitations in obtaining the accurate distribution of compressive stress at the bottom of the bearing plate, there is often a significant deviation between the measured subgrade resilient modulus and the actual condition. To address this issue, a flexible bearing plate can be used to test the subgrade and obtain a more accurate resilient modulus. In this study, we use variance and degree of mean deviation to quantitatively evaluate the distribution uniformity of compressive stress. To create a rigid-flexible bearing plate that is similar to a flexible bearing plate, we explore the combinatorial design of steel plates and rubber mats. We examine factors such as the thickness (10, 20, and 30 mm) of the steel plate, elastic modulus (5, 10, and 20 MPa) and thickness (10, 20, and 30 mm) of the rubber mat, friction coefficient (μ:0, 0,2, 0.4, 0.6, 0.8, ∞) between the bearing plate and subgrade, and the combined shape characteristics of the rubber mat and steel plate. To reduce friction between the rubber mat and subgrade, we use lubricant, and through our design process, we develop a flexible bearing plate with relatively uniform compressive stress. Our computations show that when μ = 0.05, the variance is 0.0001, and the degree of mean deviation is 0.0780. These results indicate that the distribution uniformity of the compressive stress is very close to the uniform distribution load, which meets the necessary accuracy requirements for engineering applications.

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Section: Introductionmentioning

confidence: 99%

A flexible bearing plate based on steel plate and rubber mat

2023

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Comparison of pressuremeter and plate loading results to determine the deformation modulus in fine-grained soil

Cheshomi,

Khalili

2024

Bull Eng Geol Environ

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Identification of Parameters and Fatigue Life Assessment of the Road Pavement Lower Construction Layers under Heavy Construction Traffic

Mackiewicz

Krawczyk

2022

Materials

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This article analyzes the results of testing the subgrade and the lower layers of the pavement structure with the light weight deflectometer at a load of 0.1 and 0.15 MPa. It is shown that, with layer systems with an equivalent layer modulus lower than 80 MPa, significant nonlinear phenomena occur at a load of 0.15 MPa. In this situation, the identification of a reliable replacement module, a commonly used test method, at a load of 0.1 MPa, is not appropriate—it significantly overestimates the value of the modules (even by 34%), which in turn translates into a significant overestimation of the fatigue life of the structure. In a situation where intensive exploitation of the lower layers of the pavement structure is planned before the final layer arrangement is made, it is required to apply test loads corresponding to the stress conditions occurring in these layers of the structure. Such a situation takes place under the influence of technological (construction) or temporary traffic (substitute, e.g., by-pass) during construction. In order to verify the above assumptions, numerical calculations (FEM) were carried out in the elastic model for layered structures with replacement modules determined in field tests. It was found that, especially in the case of low-bearing layer systems, it is necessary to use correction factors for modules determined with a dynamic plate at a load of 0.1 MPa. Taking into account the corrected values of the modules will allow to correctly determine the change in the durability of layers at the construction stage and in the subsequent operation of the final pavement structure.

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Development and preliminary application of a plate loading model test system considering stress state

Cited by 3 publications

References 35 publications

A flexible bearing plate based on steel plate and rubber mat

A flexible bearing plate based on steel plate and rubber mat

Comparison of pressuremeter and plate loading results to determine the deformation modulus in fine-grained soil

Identification of Parameters and Fatigue Life Assessment of the Road Pavement Lower Construction Layers under Heavy Construction Traffic

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