Subgrade fill strength and bearing characteristics of weathered phyllite blended with red clay

Zhao, Xiushao; Fu, Zhitao; Yang, Qian; Yao, Kai; Geng, Daxin; Li, Kai

doi:10.1080/14680629.2020.1773906

Cited by 12 publications

(11 citation statements)

References 23 publications

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“…The shear strength of CWP can be greatly and rapidly improved by adding red clay into CWP at various blending ratios [26]. The experimental proportioning method was designed as follows: Based on the dry weight of CWP soil (m 0 ) and a blending ratio (λ), a portion of red clay at 0%, 20%, 40%, 60%, 80% and 100% was added into phyllite soil, respectively.…”

Section: Experimental Materials and Blending Ratio Designmentioning

confidence: 99%

“…6, δ ep decreases approximately linearly with the increase of compaction coefficient. The larger the compaction coefficient of fine-grained soil, the higher the cohesive force [26] of soil matrix is, requiring a greater force to overcome the expansion.…”

Section: Influence Of Compaction Coefficient K On δ Epmentioning

confidence: 99%

“…5. Considering that the requirement of liquid limit is less than 40% in the code TB 10001-2016, the blending ratio of red clay should be in a controlled range from 13% to 52% [26]. The free load swell index decreases with the increase of the blending ratio, and the bearing capacity of the compacted subgrade increases with the increase of the blending ratio when the blending ratio is in the range of 13%-52%.…”

Section: Determination Of Optimum Blending Ratiomentioning

confidence: 99%

“…Furthermore, the cementation process usually needs a long time to be fulfilled [25], which is often not convenient for rapid subgrade construction using locally won soils. Recently a new blending method of the CWP soil with red clay at an optimal ratio has been proposed by Zhao et al to effectively improve the shear strength of the subgrade [26].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Study of Mutual Improvement of Completed Weathered Phyllite and Red Clay Based on Neutralization Effects of Swelling and Shrinkage Deformation

Zhao¹,

Yang²,

Rao³

et al. 2022

Journal of Renewable Materials

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Completely weathered phyllite (CWP) soil is a kind of special soil with high swell potential, while red clay is a special soil with high shrinkage. This means that these two kinds of special soils are usually not suitable for direct use as subgrade fill. To reduce the swell index of the CWP soil and the shrinkage of red clay at the same time, it was proposed to blend the CWP soil with red clay to improve their basic characteristics. A series of swell index tests and dry-wet cycle tests of the blended soils have been carried out at varying blending ratios, compaction coefficients and moisture contents. The test results show that the free swell index of the blended soil decreases with the increase of red clay, moisture content and compaction coefficient, respectively. The fissure density of the blended soil first decreases and then increases with the blending ratio, with the lowest being zero when the blending ratio is ranging from 20% to 40%. Through particle microscopic analysis and elemental composition analysis, it is found that the neutralization effect, the dilution effect of swell minerals, and the partition effect of coarse particles play an important role in restraining expansion and shrinkage deformation of the blended soil. Based on the liquid limit requirement of Chinese Railway Design Code (TB 10001-2016), the optimal blending ratio of red clay has been proposed to be 50%. Compared with the CWP soil, the free load swell index of the blended soil is reduced by 45.0% and the fissure density is reduced by 99.3% compared with that of red clay. Therefore, it is feasible to improve the CWP soil by blending it with red clay at an optimal ratio of 50% by using the neutralization effect of the expansion of CWP and shrinkage of red clay.

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Section: Experimental Materials and Blending Ratio Designmentioning

confidence: 99%

Section: Influence Of Compaction Coefficient K On δ Epmentioning

confidence: 99%

Section: Determination Of Optimum Blending Ratiomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Study of Mutual Improvement of Completed Weathered Phyllite and Red Clay Based on Neutralization Effects of Swelling and Shrinkage Deformation

Zhao¹,

Yang²,

Rao³

et al. 2022

Journal of Renewable Materials

Self Cite

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show abstract

“…The feasibility of using phyllite as subgrade filler was explored in many domestic and international studies. Based on the research and analysis of the basic mineral composition, strength, and compaction characteristics of weathered soft rock, initially, the feasibility of using weathered soft rock to fill the subgrade was determined, and a preliminary determination method was proposed [15][16][17][18][19]. Yang et al discussed the standard of soft rock as a filler and studied the influence of the weathering degree and rock structure on weathered soft rock through rock strength test and particle-breaking test [20].…”

Section: Introductionmentioning

confidence: 99%

Investigation on cement-improved phyllite based on the vertical vibration compaction method

Jiang

Fan

et al. 2021

PLoS ONE

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The vertical vibration compaction method (VVCM), heavy compaction method and static pressure method were used to form phyllite specimens with different degrees of weathering. The influence of cement content, compactness, and compaction method on the mechanical properties of phyllite was studied. The mechanical properties of phyllite was evaluated in terms of unconfined compressive strength (Rc) and modulus of resilience (Ec). Further, test roads were paved along an expressway in China to demonstrate the feasibility of the highly weathered phyllite improvement technology. Results show that unweathered phyllite can be used as subgrade filler. In spite of increasing compactness, phyllite with a higher degree of weathering cannot meet the requirements for subgrade filler. With increasing cement content, Rc and Ec of the improved phyllite increases linearly. Rc and Ec increase by at least 15% and 17%, respectively, for every 1% increase in cement content and by at least 10% and 6%, respectively, for every 1% increase in compactness. The higher the degree of weathering of phyllite, the greater the degree of improvement of its mechanical properties.

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Effects of autoclaved aerated concrete powder admixture on compaction and shear strength characteristics of wet filter cakes

Zhan

Wang

et al. 2023

J Mater Cycles Waste Manag

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Subgrade fill strength and bearing characteristics of weathered phyllite blended with red clay

Cited by 12 publications

References 23 publications

Study of Mutual Improvement of Completed Weathered Phyllite and Red Clay Based on Neutralization Effects of Swelling and Shrinkage Deformation

Study of Mutual Improvement of Completed Weathered Phyllite and Red Clay Based on Neutralization Effects of Swelling and Shrinkage Deformation

Investigation on cement-improved phyllite based on the vertical vibration compaction method

Effects of autoclaved aerated concrete powder admixture on compaction and shear strength characteristics of wet filter cakes

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