Experimental investigation of creep behavior of loess under different moisture contents

Tang, Hao; Duan, Zhao; Wang, Dongpo; Qi, DANG

doi:10.1007/s10064-019-01545-8

Cited by 29 publications

(12 citation statements)

References 30 publications

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“…Zhou et al (2016) conducted creep tests under different confining pressure and temperature conditions and established a rate-dependent constitutive model for frozen loess. Tang et al (2020) conducted triaxial creep tests using a rheological triaxial test apparatus and proposed a dual-element creep model to describe the creep process of loess. Zhu et al (2014) investigated the creep properties of red-layer slip zone soils under different vertical loading and water content conditions through direct shear creep tests.…”

Section: Introductionmentioning

confidence: 99%

Creep Behavior of Intact Loess Followed Unloading Paths

Wang

Zhang

2021

Front. Earth Sci.

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Several high-fill projects are carried out on the Loess Plateau, China, accompanying the progressive failure of slopes due to excavation. The compelling need requires a deep understanding of variation in the creeping behaviors of intact loess exposed to unloading. A series of creep tests of intact loess were performed under two separated unloading paths: decrease in confining pressure at constant deviator stress and decrease in confining pressure at axial stress. The results demonstrated that axial deformation followed the first unloading path always appears as compression while the three forms of axial deformation followed the second path, depending on the applied axial stress level. At a low unloading stress level, the elongation of axial deformation was observed. At a relatively unloading stress level, the axial deformation of the soil experienced the first elongation and then compression. At a high unloading stress level, the axial deformation appeared as compression, and finally, failure occurred with the increase of the unloading stress level. The failure approach index was introduced to use as the criterion for the loess to transform from stable to accelerated creeping. Finally, a modified Burgers model was proposed to characterize the creeping behavior of intact loess followed unloading paths. There was a good comparison between the calculated and measured data of the soil that establishes the rationality and validity of the proposed model.

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Section: Introductionmentioning

confidence: 99%

Creep Behavior of Intact Loess Followed Unloading Paths

Wang

Zhang

2021

Front. Earth Sci.

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“…e results show that the compression and expansion indices are affected by temperature, and the yield stress decreases with increases in temperature. Tang et al [28] e mechanical properties of soil are closely related to its the structural characteristics [29][30][31]. e method of combining macromechanical experiment and micromechanical test technology to analyze the soil structure characteristics and elaborate the macro mechanical mechanism is very effective.…”

Section: Introductionmentioning

confidence: 99%

Direct Shear Creep Characteristics and Microstructure of Fiber‐Reinforced Soil

Tang

Duan

et al. 2021

Advances in Civil Engineering

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Fiber-reinforced soil is an excellent engineering material that has become a focus of research. Most studies focus on the conventional mechanical properties of reinforced soil, such as its tensile, compressive, and shear strength, and rarely study its creep-related mechanical properties. However, when such soil is used as backfill, the creep effect should not be ignored. This study explored the characteristics of creep mechanics in reinforced soil, the fiber-reinforcement mechanism, and the dynamics of microstructures before and after creep tests. Direct shear creep tests were carried out using a direct shear creep tester on soil reinforced with natural palm fibers of equal length (1.5 cm) in different amounts (0%, 0.2%, 0.6%, 1.0%). Microscale tests were carried out on the reinforced soil samples before and after the creep tests by polarized light and scanning electron microscopy. The results show that the fiber reinforcement can restrain the deformation and enhance the long-term strength of soil. However, a nonlinear relationship between the reinforcement effect and fiber content was found, with 0.6% being the optimal content. Palm fibers have rough surfaces, grooves, and independent pore chambers, which increase the effective contact area and interaction with the soil. With increases in fiber content, the fibers interweave to form a nestled network structure, which increases the strength and integrity of the soil. Fiber addition changes the microstructure of the soil pores; the proportion of large pores decreases and that of small pores increases. Under the effect of creep, the pore changes follow the principle of pore homogenization; large pores are destroyed and transformed into small pores, causing the porosity of reinforced soil to decrease faster and be less porous than unreinforced soil. This research can provide technical reference for the engineering application of palm fiber-reinforced soil.

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“…e loess covers a vast area, with a total area of 13 million km 2 , covering more than 9.3% of the global continental area. e total area of loess in China is about 640000 km 2 , accounting for 6.3% of the total land area, of which loess is the most widely distributed in Western China, accounting for 50%-60% of the total area in the western region.…”

Section: Introductionmentioning

confidence: 99%

“…e total area of loess in China is about 640000 km 2 , accounting for 6.3% of the total land area, of which loess is the most widely distributed in Western China, accounting for 50%-60% of the total area in the western region. e creep behavior of loess is one of the most important problems to be studied [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

A Test Method for Creep Characteristics of Loess Based on the One‐Dimensional Consolidator

Huang

Wang

et al. 2021

Advances in Civil Engineering

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When the traditional one-dimensional consolidator is used to study the creep characteristics of loess, due to the hoop effect of the ring cutter, only the attenuation creep stage and stable creep stage of loess can be studied, but the accelerated creep stage cannot be presented. In order to avoid the influence of drilling on the creep characteristics of loess, the paper improves the consolidation instrument by drilling holes along the diameter direction in the center of the sample to provide artificial space for soil failure. At the same time, the sample size is increased to ensure that the diameter of the sample is greater than five times of the diameter of the borehole, so as to avoid the influence of drilling on the creep characteristics of loess. The creep characteristics of loess are studied by step loading (vertical pressure at all levels is 125 kPa, 175 Pa, 225 kPa, and 275 kPa), and the whole creep process characteristic curves of loess under different stress conditions are obtained. An endoscope was placed in the hole to observe the deformation and failure characteristics of loess in different stages of creep. This method makes up for the defect that the traditional one-dimensional consolidator cannot obtain the whole process characteristics of loess creep. At the same time, it has the advantages of simple operation, less external influence factors, stronger data reliability, and can directly observe the changes of loess creep soil. It has a beneficial role in promoting the experimental research of loess creep characteristics.

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Experimental investigation of creep behavior of loess under different moisture contents

Cited by 29 publications

References 30 publications

Creep Behavior of Intact Loess Followed Unloading Paths

Creep Behavior of Intact Loess Followed Unloading Paths

Direct Shear Creep Characteristics and Microstructure of Fiber‐Reinforced Soil

A Test Method for Creep Characteristics of Loess Based on the One‐Dimensional Consolidator

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