An Experimental Study on the Shear Strength of Undisturbed Loess

Ying, Jie; Liao, Hongjian; Yin, Jianhua

doi:10.1061/40860(192)12

Cited by 3 publications

(2 citation statements)

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“…In the study of soil properties under controlled climatic conditions, soil column testing has been extensively discussed in the literature [14] [4] [15] [16]. According to Sentenac [17] the flow velocity around the column wall can be greater than that at the column center due to low compaction of the soil and the preferred pathway flow adjacent to the wall, particularly in small-diameter columns [16].…”

Section: Laboratory Drying-wetting Cycle Testmentioning

confidence: 99%

Study of the Rainfall Infiltration Effect and Soil Strength Variation on Unsaturated Laterite Terraces

Chung¹

2019

World Congress on Civil, Structural, and Environmental Engineering

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The lateritic terraces of northern Taiwan have unsaturated soil due to their higher elevation and deeper groundwater level. Under the effects of rainfall infiltration and surface evaporation, the topsoil often changes in humidity; thus, the soil strength also changes. As there are a large number of structures in these terraces, it is necessary to further understand the influence of rainwater infiltration in order to design a safe and economical foundation structure. In this paper, tensiometers were installed in-situ to observe changes in soil matric suction. An undisturbed soil column was taken and drying and wetting tests were conducted to understand the depth of water infiltration. Meanwhile, a direct shear test was performed using specimens with different water contents taken from the soil column. The corresponding soil matric suction was derived from the relationship of the soil water content and tensiometer readings of the tests. The results showed that, during rainwater infiltration, the soil near the surface reacted immediately. The influence of the rainwater infiltration reached about 120 cm below the surface. The soil shear strength decreased with the increasing soil moisture content. In other words, rainfall would reduce the soil matric suction and the shear strength of the soil would decrease.

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Section: Laboratory Drying-wetting Cycle Testmentioning

confidence: 99%

Study of the Rainfall Infiltration Effect and Soil Strength Variation on Unsaturated Laterite Terraces

Chung¹

2019

World Congress on Civil, Structural, and Environmental Engineering

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“…Irrigation can not only change the groundwater levels but the physical properties of the loess. Many scholars [22][23][24][25][26][27][28][29][30][31] have studied the physical and mechanical properties of loess under irrigation. ey obtained the soil-water characteristic curves and permeability properties of loess under different conditions, as well as the deformation and strength characteristics of loess under different stress paths.…”

Section: Introductionmentioning

confidence: 99%

An Experimental and Numerical Study of Landslides Triggered by Agricultural Irrigation in Northwestern China

Sun

Wang

et al. 2020

Advances in Civil Engineering

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Chinese Loess Plateau (CLP) has become one of the high-incidence areas of landslide disasters in China, especially at the edge of the tablelands where irrigation has been practiced at a large scale since the 1960s. Heifangtai tableland, located in the CLP in Yongjing County, Gansu Province, has been selected as a case, where more than 90 slidings occurred in the past three decades. Field monitoring and laboratory tests were conducted to obtain the soil-water characteristic curve, unsaturated soil shear strength, irrigation water infiltration, and the groundwater level change. Based on these results, a three-dimensional numerical model of the slope was established, and the change of seepage field and slope stability before and after irrigation was investigated using simulations and compared with the observed data. The results show that flood irrigation raised the water table, and the increase of soil moisture in the flooded area was more significant than that in the nonirrigated area. The rising speed of the groundwater level was about 0.25 m/yr, with an amplitude of 0.5 m. Near the slope, the hydraulic gradient of the concave slope was steeper than the convex slope. The shear strength of the loess decreased with increasing soil moisture, and the tensile strength was about 15% of the cohesion. Numerical results showed that after three years of continuous flood irrigation at the back of the slope, the slope stability coefficient decreased by 0.12. After irrigation, the potential slip zone slightly expanded. The reason why landslides often occurred at the back of the gully or the landslide was that the water table was shallower on concave slopes and the soil moisture of the concave slopes was more susceptible to irrigation.

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Behavior of a Compacted Completely Decomposed Granite Soil from Suction Controlled Direct Shear Tests

Hossain

Yin

2010

J. Geotech. Geoenviron. Eng.

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An Experimental Study on the Shear Strength of Undisturbed Loess

Cited by 3 publications

References 0 publications

Study of the Rainfall Infiltration Effect and Soil Strength Variation on Unsaturated Laterite Terraces

Study of the Rainfall Infiltration Effect and Soil Strength Variation on Unsaturated Laterite Terraces

An Experimental and Numerical Study of Landslides Triggered by Agricultural Irrigation in Northwestern China

Behavior of a Compacted Completely Decomposed Granite Soil from Suction Controlled Direct Shear Tests

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