Dynamic characteristics of overconsolidated remolded red clay in Southwest China: an experimental study

Cheng, Yuzhu; Yang, Guoyue; Long, Zhiling; Yang, Dong; Xu, Yungui

doi:10.1007/s10064-022-02683-2

Cited by 12 publications

(3 citation statements)

References 22 publications

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“…Laterite is a type of highly plastic clay formed by the lateralization of carbonate rocks, and is widely distributed in the Yunnan, Guizhou, Sichuan, and Guangxi provinces in China. It has special physical and mechanical properties such as high-water content, a high plastic liquid limit, a large void ratio, and low compressibility [1][2][3][4] . The conventional compaction characteristics of soil in dams, foundations, and roadbeds have typically been evaluated by sampling to provide the compaction density.…”

Section: Introductionmentioning

confidence: 99%

A resistivity-based experimental compaction model for Yunnan laterite

Peng

Zhao

et al. 2023

Preprint

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Soil resistivity can effectively reflect the variation in structural characteristics of soils. The changes in soil resistivity can indirectly represent the degree of soil compaction, which is of great significance for the rapid evaluation of soil compaction. Yunnan laterite, in China, has widely been used as a building material in foundations, roadbeds, and dams due to its high strength and low compression. In this work, we tested the vertical and lateral resistivity of laterite during consolidation compression through an improved consolidation compression resistivity tester to discuss the variations in resistivity structural characteristic parameters (structural factor, shape factor, and anisotropy coefficient). A comprehensive index of resistivity structure characteristics was proposed to create a compactness evaluation model of laterite. The results showed that the vertical resistivity, lateral resistivity, average structural factor, and average shape factor of laterite gradually increased with continuous multi-stage vertical loading; however, the anisotropy coefficient decreased first, and then slowly increased to a stable state. The comprehensive index of resistivity structure characteristics could indirectly reflect the water content and pore content of the laterite, and the lateral resistivity was predicted from the vertical resistivity. Considering the influence of saturation and porosity on the resistivity structure characteristics, the evaluation model of compaction for laterite was finally established based on resistivity characteristics and this model had high accuracy, with small model verification error and good applicability. The proposed prediction model could serve as a theoretical reference for the application of the high-density electrical method in the convenient detection of compaction for laterite rolling engineering.

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Section: Introductionmentioning

confidence: 99%

A resistivity-based experimental compaction model for Yunnan laterite

Peng

Zhao

et al. 2023

Preprint

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“…In summary, there is no unified standard for compaction control of fill embankments, both domestically and internationally. There are no specific reference opinions on the relaxation requirements for compaction and moisture content, and the engineering characteristics of red clay fillers vary in different regions [ 12 , 13 ]. Therefore, it is urgent to start from the basic needs of filling red clay embankments, exploring the relationship between the basic physical and mechanical indicators of Guangxi red clay and the changes in compaction and moisture content and providing guidance for engineering construction [ 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Influence Mechanism of Water Content and Compaction Degree on Shear Strength of Red Clay with High Liquid Limit

Feng,

Teng,

Wang

2023

Materials

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To investigate the influencing factors and mechanisms of shear strength of red clay with a high liquid limit, which was selected at different milepost locations based on the Nanning Bobai Nabu Section Project of the Nanning Zhanjiang Expressway, the basic physical properties of red clay were determined using a liquid plastic limit test, compaction test, inductively coupled plasma optical emission spectrometer (ICP-OES), and X-ray fully automatic diffractometer (XRD). Red clay with a high liquid limit was selected. Furthermore, the direct shear test was used to study the effect of different water contents and compaction degrees on the shear strength. The experimental results demonstrate that under the same compaction degree, the shear stress of the soil sample increases significantly with an increase in normal stress, and the greater the water content, the smaller the shear stress of the soil sample. At 200 kPa, the shear strength of soil samples with 24% water content is 57%, 46%, and 35% of the shear strength of soil samples with 15% water content under different compaction degrees(K) of 86%, 90%, and 93%, respectively. Under the same moisture content, the shear stress of the soil sample shows an increasing trend with an increase in the degree of compaction, and the greater the compaction degrees, the greater the shear stress of the soil sample. The cohesion c and internal friction angle φ of soil samples increase with an increase in the compaction degree, but the increase in cohesion c is also affected by the water content. Under the condition of low water content, the cohesion c of soil samples can be increased by 1.06 times when the water content is 15% and by 0.47 times when the water content is 18%. Under the condition of high water content, the cohesion c of soil samples with 21% water content only increases by 0.3 times, and that with 24% water content only increases by 0.35 times.

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“…In regard to compacted red clay, the dynamic elastic modulus tends to stabilize at fewer cyclic vibrations when the dynamic stress is minor; moreover, at higher dynamic stress, the dynamic elastic modulus decreases rapidly with cyclic pulses and then tends to stabilize [5][6][7][8][9][10][11]. Tang [12], Cai [13], Lei [14], and Liu [15] found that there was a critical cyclic stress ratio for the development of the dynamic elastic modulus of cohesive soils under cyclic loading.…”

Section: Introductionmentioning

confidence: 99%

Experiments and Modeling of the Attenuation of the Dynamic Elastic Modulus of Saturated Red Clay under Cyclic Loading

Zhuang

Chen³

et al. 2022

Sustainability

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Due to the long-term effect of cyclic traffic loads, the accumulated deformation of red clay subgrades is increasing, strength is decreasing, and problems such as uneven settlement are occurring. In order to improve the stability and durability of red clay subgrade, this paper analyzes the effects of cyclic stress ratios and compactness on the development of the dynamic elastic modulus of saturated red clay. This is achieved through dynamic triaxial tests on red clay in the Qingyuan County, Zhejiang Province, China. The results show that the saturated red clay has an attenuation threshold cyclic stress ratio under cyclic loading. The attenuation threshold cyclic stress ratio prediction models were constructed based on the confining pressure and compactness, respectively. By introducing the concept of a relative cyclic stress ratio, the prediction model of the dynamic elastic modulus of saturated red clay (as based on cyclic vibration times and close cyclic stress ratio) is constructed. The model realizes the prediction of the dynamic elastic modulus of red clay under arbitrary cyclic vibration times via the initial cyclic stress ratio, compactness, and other parameters. It provides a theoretical basis for rationally evaluating the dynamic stability of red clay subgrade under cyclic loading.

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Dynamic characteristics of overconsolidated remolded red clay in Southwest China: an experimental study

Cited by 12 publications

References 22 publications

A resistivity-based experimental compaction model for Yunnan laterite

A resistivity-based experimental compaction model for Yunnan laterite

Influence Mechanism of Water Content and Compaction Degree on Shear Strength of Red Clay with High Liquid Limit

Experiments and Modeling of the Attenuation of the Dynamic Elastic Modulus of Saturated Red Clay under Cyclic Loading

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