Large triaxial test study on dynamic characteristics of round gravel
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ORIGINAL PAPER
Large triaxial test study on dynamic characteristics of round gravel Shaokun Ma 1 & Zhibo Duan 1 & Ying Liu 1 & Bo Wang 1 & Yu Shao 2,3 Received: 27 August 2019 / Accepted: 12 August 2020 / Published online: 18 August 2020 # Saudi Society for Geosciences 2020
Abstract A series of large-scale drained dynamic triaxial tests were conducted on Nanning saturated gravel soil to investigate dynamic characteristics. The effects of relative density, dynamic stress amplitude, and the number of load cycles on the pore pressure, accumulation strain, and stress–strain hysteresis loops of saturated round gravel soil were analyzed. Experimental results indicated that the curves of accumulated axial strain with the number of load cycles present stable type. When the dynamic stress amplitudes were small, the increasing rule conforms to hyperbolic function. A linear relation between the parameter α in the hyperbolic function with the dimensionless DCR had been found. A double-lined model was set up to simulate the stress–strain hysteresis of saturated round gravel under a large number of load cycles. Then, results of the double-line model were validated against triaxial test results. The model was verified to be capable of predicting with accuracy the relationship between the stress– strain and area change behavior of saturated gravel soils. A particular feature of the model was that it only has three parameters than other models and applicable. Keywords Saturated gravel . Large-scale dynamic triaxial test . Dynamic characteristics . Relative density
Introduction Round gravel is widely distributed in the substrates of metro cities in China. Therefore, tunnel excavation will inevitably pass through the gravel layer. Generally, water pressure is
Responsible Editor: Zeynal Abiddin Erguler * Ying Liu [email protected] Shaokun Ma [email protected] Zhibo Duan [email protected] Bo Wang [email protected] Yu Shao [email protected] 1
College of Civil Engineering and Architecture, GuangXi University, Nanning 530004, China
2
Guangxi Xinfazhan Communications Group Co., Ltd, Nanning 530029, China
3
Guangxi Communications Design Group Co., Ltd, Nanning 530029, Guangxi, China
high in the gravel layer, and the local river is the main source of constant head for the groundwater. During the operation of the railway, the accumulated residual deformation due to long-term train operation may exceed the ultimate state. The round gravel will be prone to breakage under cyclic loading due to its relatively large particle size. Then, significant rearrangement of the soil structure is hazardous to the surrounding buildings. It is therefore essential to investigate the dynamic characteristics of the gravel subsoil during long-term railway operation to enhance both risk analysis and the engineering design method. In recent years, many researchers have studied on gravel soil of railway ballast by large-scale dynamic triaxial test to investigate the dynamic deformation and deformation mechanism under cyclic loading while considering
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