Estimation of modulus of elasticity of compacted loess soil and lateritic-loess soil from laboratory plate bearing test

Chindaprasirt, Prinya; Sriyoratch, Arkhom; Arngbunta, Anukun; Chetchotisak, Panatchai; Jitsangiam, Peerapong; Kampala, Apichit

doi:10.1016/j.cscm.2021.e00837

Cited by 5 publications

(3 citation statements)

References 11 publications

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“…Zhang et al (2018) proved the necessity of using a two-parameter foundation model by outdoor bearing plate testing. Chindaprasirt et al (2022) accurately estimated the resilient modulus of on-site loess and laterite-loess They conducted the flexible bearing plate testing and the rigid bearing plate testing. Based on the testing results, the optimal rheological model and corresponding parameters of the rock aging deformation model were determined according to the optimized inversion method.…”

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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“…In China's current specifications, the resilience modulus is used as the design index, thereby reflecting the bearing capacity of the subgrade [9]. During the actual field testing process, the detection methods of resilient modulus chiefly comprise the bearing plate method, the Benkelman beam deflection method, and the Falling Weight Deflectometer (FWD) method [10,11]. The detection result of the bearing plate method represents the static resilient modulus; nevertheless, this method is time-consuming and labor-intensive, and data processing is relatively complex [12].…”

Section: Introductionmentioning

confidence: 99%

Rapid evaluation method of subgrade performance using Portable Falling Weight Deflectometer

2023

Archives of Civil Engineering

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The performance evaluation of new and old subgrades is critical for the quality and safety of reconstruction and extension projects. It is necessary to achieve rapid and easy performance testing. In this study, a Portable Falling Weight Deflectometer (PFWD) is chosen to rapid evaluate the performance of subgrade. First, a testing area, the reconstruction and expansion project of the Hefei to Dagudian section of the Shanghai-Shaanxi Expressway, is selected. Then, the PFWD modulus 𝐸 𝑝 of resilient tested by PFWD and the corresponding water content 𝑤 and compacting degree 𝐾 tested by the cutting ring method for old subgrade are obtained. And the correlation relationship between 𝐸 𝑝 and 𝑤 and 𝐾 is established. The performance of old subgrade can be rapid obtained by PFWD. Meanwhile, for the new subgrade, the correlation relationship between 𝐸 𝑝 and bending value 𝐿, 𝑤 and 𝐾 is established, and the performance can also be rapid tested by PFWD. Finally, a rapid evaluation method for the reconstruction and expansion of subgrade performance was proposed, which aims to provide technical support for ensuring construction quality and safety and provides a technical reference and a theoretical basis for the prediction of similar subgrade performance.

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“…A substantial amount of research has been carried out to study the mechanical properties of various soils. Chindaprasirt et al [ 5 ] estimated the elastic modulus of loess and laterite by laboratory test. Xiao et al [ 6 ] analyzed the fractal dimension and its variation law of undisturbed loess and compacted loess.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Changes to Triaxial Shear Strength Parameters and Microstructure of Yili Loess with Drying–Wetting Cycles

et al. 2021

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This research examined the drying–wetting cycles induced changes in undrained triaxial shear strength parameters and microstructural changes of Yili loess. The drying–wetting cycles were selected as 0, 1, 3, 5, 10, 20 and 30. Then, we collected Yili loess samples and performed unconsolidated-undrained (U-U) triaxial shearing tests to ascertain the variation in shear strength parameters with drying–wetting cycles. Additionally, we investigated the microstructural changes of Yili loess samples under drying–wetting cycles simultaneously via nuclear magnetic resonance (NMR) and scanning electron electroscopy (SEM). Finally, we established a grey correlation model between shear strength and microstructural parameters. Under U-U conditions, the prime finding was that the loess’s shear strength parameters changed overall after drying–wetting cycles; in particular, the internal friction angle φ dropped significantly while the cohesion c changed only slightly during cycles. For all the cycles, the first cycle gave the highest change. Soil morphology deterioration was evident at the initial stage of cycles. During the entire drying–wetting cyclic process, pore size distribution showed progressive variance from two-peak to a single-peak pattern, while both porosity and the fractal dimension of pores increased gradually towards stability. Soil particle morphology became slowly simple and reached the equilibrium state after 20 drying–wetting cycles. Under cyclic drying–wetting stress, the shear strength parameter changes were significantly correlated to microstructural modifications. This investigation was related to loess in the westerly region. The findings were expected to provide new insight into establishment of the connection between microstructure and macro stress–strain state of loess. To some extent, it provided a theoretical basis for the prevention and control of loess engineering geological disasters in Yili, Xinjiang and other areas with similar climate and soil types.

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Estimation of modulus of elasticity of compacted loess soil and lateritic-loess soil from laboratory plate bearing test

Cited by 5 publications

References 11 publications

A flexible bearing plate based on steel plate and rubber mat

A flexible bearing plate based on steel plate and rubber mat

Rapid evaluation method of subgrade performance using Portable Falling Weight Deflectometer

Investigation of Changes to Triaxial Shear Strength Parameters and Microstructure of Yili Loess with Drying–Wetting Cycles

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