Measurement and Calculation of Fissure Area and Density for Shrinkage Soil

Zhao, Xiushao; Wang, Zhiyao; Chen, Kaisheng; Yang, Qian; Geng, Daxin; Fu, Zhitao

doi:10.1088/1755-1315/560/1/012088

Cited by 2 publications

(3 citation statements)

References 10 publications

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“…Firstly, the color image is converted into black and white two-color image by algorithm, and the fissure density is calculated by the proportion of black and white pixels. For specific calculation method, refer to reference [33].…”

Section: Influencing Factors Of Fissure Development Of Blended Soilmentioning

confidence: 99%

“…During dry-wet cycles, some blended soil samples produced irregular fissures on the surface, and it is difficult to count the length of fissures by traditional methods. It can be measured by AutoCAD multisegment line tracking method, and then the actual length of cracks can be obtained by unit conversion [33].…”

Section: Influencing Factors Of Fissure Development Of Blended Soilmentioning

confidence: 99%

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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: Influencing Factors Of Fissure Development Of Blended Soilmentioning

confidence: 99%

Section: Influencing Factors Of Fissure Development Of Blended Soilmentioning

confidence: 99%

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

“…However, red clay has high shear strength due to iron cementation in the case of low saturation [24][25][26], and the high cohesion of red clay can be used for specific improvement of CWP. The research shows that the shear strength of blended soil increases with the increase of red clay blending ratio, and the improvement method can also reduce the expansibility of CWP and the fissure rate of red clay undergo dry-wet cycles [27,28].…”

Section: Introductionmentioning

confidence: 96%

Experimental Study on Improvement Effects of Completely Weathered Phyllite Using Red Clay and Cement for High-Speed Railway Embankments

Zhao¹,

Rao²,

Yang³

et al. 2022

Journal of Renewable Materials

Self Cite

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Completely weathered phyllite (CWP) has the characteristics of difficult compaction, low shear strength after compaction and large settlement after construction. The traditional improvement method using a single agent of red clay or cement for CWP satisfies the subgrade requirements for ordinary railway, but cannot meet the requirements of immediate strength and long-term post-construction settlement of high-speed railway at the same time. A series of experimental investigations were undertaken for the blended CWP soils, with three additives used. The first additive was red clay, the second was cement and the third was a combination of both red clay and cement at various portions. Results of consolidation test and shear strength test carried out for the treated CWP soils show that: 1) The effect of cement on improving the compression modulus of CWP is much better than that of red clay; 2) The settlement of an embankment of 10 m high formed by blended soil of CWP with 3% cement can be controlled within 15 mm, while the settlement will be 25.15 mm for the same embankment of blended soil of CWP with 40% red clay; 3) The shear strength and ultimate bearing capacity of CWP improved by red clay are much better than those of 5% cement; 4) The ultimate bearing capacity of CWP improved by 40% red clay is 3.42 times of that by 3% cement and 2.95 times by 5% cement. Furthermore, the bearing capacity of CWP when improved by red clay can meet railway subgrade requirements immediately after compaction, while cement improved CWP needs a curing time of 1 day or longer. This is an impediment to rapid construction process. The improvement mechanism of red clay is mainly filling effect and grading improvement effect, while the improvement mechanism of cement is mainly hardening reaction, which produces high strength material to cement. It is found that 40% red clay and 3% cement treated CWP, which is considered to be optimum, can meet the subgrade requirements of both immediate bearing capacity and long-term post-construction settlement for the high-speed railway.

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Measurement and Calculation of Fissure Area and Density for Shrinkage Soil

Cited by 2 publications

References 10 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

Experimental Study on Improvement Effects of Completely Weathered Phyllite Using Red Clay and Cement for High-Speed Railway Embankments

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