Experimental study of the shear strength of soil from the Heifangtai Platform of the Loess Plateau of China

Gu, Tianfeng; Wang, Jiading; Wang, Chenxing; Bi, Yinqiang; Guo, Qianyi; Liu, Yaming

doi:10.1007/s11368-019-02303-9

Cited by 38 publications

(17 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…e research methods are mainly indoor direct shear test and triaxial test. e research objects are mainly intact loess and remolded loess [17][18][19][20][21][22][23][24][25], lignin [26], and lime-improved loess [27]. e research conditions are dry-wet cycle [28] and freeze-thaw cycle [29], which enrich the research results of loess shear strength.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Main Physical Parameters Controlling Shear Strength of Unsaturated Loess

Wentong

Dong

Sun

et al. 2021

Advances in Civil Engineering

View full text Add to dashboard Cite

It is particularly important to study the strength of unsaturated loess, and its accurate determination is crucial to the stability analysis of soil slope and foundation and calculation of earth pressure. In order to reveal the control mechanism of physical parameters on the shear strength of unsaturated loess, the intact and remolded loess were used as the research object; sandy silt, quartz flour, and quartz sand were used as contrast; the systematic direct shear tests of unsaturated loess, sandy silt, and quartz sand under different conditions of water content, dry density, and clay content were carried out. The results show that the cohesion, internal friction angle, and shear strength of unsaturated loess piecewise functionally decrease with the increase of water content, its shear strength increases linearly with the increase of dry density, and its internal friction angle shows an upward quadratic function relation with the increase of clay content. The law results of comparing sandy silt, quartz flour, and quartz sand with loess considering water content and dry density are the same; therefore, the equation of shear strength of unsaturated loess is proposed for practical engineering reference, and by the first derivative analysis of the equation, it is feasible to determine the control proportion of the three parameters on the shear strength of unsaturated loess. A stage-like difference between the three control proportions is observed, depending on the combination variations of water content and clay content.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental Study on Main Physical Parameters Controlling Shear Strength of Unsaturated Loess

Wentong

Dong

Sun

et al. 2021

Advances in Civil Engineering

View full text Add to dashboard Cite

show abstract

“…Loess mainly exists in unsaturated form, and the soil-water characteristic curve (SWCC) is one of the most important factors reflecting the internal mechanisms of unsaturated loess (Zhang et al, 2020;Han et al, 2016;Vanapalli et al, 1996). The SWCC plays an important role in understanding and simulating the characteristics of shear strength, permeability and volume change of unsaturated loess (Gu et al, 2019;.Therefore, it is very necessary to study the SWCC, which provides theoretical support for scholars to predict the impact of rainfall on the potential stability of loess landslides and the irregular settlement of foundations.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Soil-Water Characteristic Curve of Compacted Loess With Different Dry Densities Based on Nuclear Magnetic Resonance

Yuan

et al. 2021

Preprint

View full text Add to dashboard Cite

Accurate determination of soil-water characteristic (SWCC) is of great importance for understanding the mechanical properties of unsaturated loess. In this study, the compacted loess columns with different dry densities were prepared. Moisture sensor, water potential sensor and nuclear magnetic resonance (NMR) were used to investigate the SWCC and NMR signals intesity of compacted loess under different dry densities. It has been found that with increasing dry density, the saturated water content and the residual water content gradually decreases, but the decrease in residual water content is smaller, and both can establish a linear relationship with dry density. The NMR results showed that the compacted loess pore volume gradually decreased with increasing dry density. When the dry density increased from 1.45 g/cm3 to 1.55 g/cm3, the pore volume of compacted loess decreased by 14.7%, while when the dry density increased from 1.55 g/cm3 to 1.65 g/cm3, the pore volume of compacted loess decreased by 13.2%. The Van Genuchten (VG) model was used to fit the NMR results and SWCC, and a good corresponding relationship was found between the parameters. Therefore, according to the cumulative NMR intensity parameters, SWCC was predicted under different dry densities and the effect was found very well.

show abstract

“…The shear strength of unsaturated soils is greatly affected by changes in the matric suction. Modifications are made to conventional apparatuses for saturated soils to obtain shear strength parameters for unsaturated soils (e.g., Escario and Saez 1986, Melinda et al 2004, Schnellmann et al 2013, Gu et al 2019.…”

Section: 41: Shear Strengthmentioning

confidence: 99%

“…Additionally, the permeability of both the soil specimen and ceramic disk also play a role in the choice of the shearing rate because the rate should be slow enough to equalize the water pressures between the soil specimen and the ceramic disk. Direct shear test results for unsaturated soils where the shear stress does not plateau but continues to increase with shear displacement (strain hardening behavior) have also been reported (e.g., Shimada 1998, Hossain and Yin 2010a, Zhou et al 2016, Gu et al 2019. In such cases, different criteria have been used to define the "failure stress" such as at an arbitrary shear strain (Zhou et al 2016, He et al 2017) at a particular shear displacement based on standards (Gu et al 2019) or the shear stress at a maximum shear displacement (Ooi and Carter 1987).…”

Section: 41: Shear Strengthmentioning

confidence: 99%

“…Figure 6-1 shows two types of failure envelopes commonly obtained in CS direct shear tests: (i) the failure envelopes are represented by lines of different slopes for different matric suction values (Mohamed et al 2006, Hossain and Yin 2010b, Likos et al 2010, Shwan and Smith 2015; and (ii) the failure envelopes are represented by lines of the same slope for different matric suction values (Sun and Xu 2007, Zhou et al 2016, Gu et al 2019. It is therefore prudent to review the method of interpretation of the shear strength from CS direct shear tests.…”

Section: 2: Constant Suction Direct Shear Testmentioning

confidence: 99%

See 1 more Smart Citation

Suction and strength of unsaturated soils

Bulolo¹

View full text Add to dashboard Cite

show abstract

Experimental study of the shear strength of soil from the Heifangtai Platform of the Loess Plateau of China

Cited by 38 publications

References 41 publications

Experimental Study on Main Physical Parameters Controlling Shear Strength of Unsaturated Loess

Experimental Study on Main Physical Parameters Controlling Shear Strength of Unsaturated Loess

Prediction of Soil-Water Characteristic Curve of Compacted Loess With Different Dry Densities Based on Nuclear Magnetic Resonance

Suction and strength of unsaturated soils

Contact Info

Product

Resources

About