Shear strength of a compacted scaly clay in variable saturation conditions

Rosone, Marco; Farulla, Camillo Airò; Ferrari, Alessio

doi:10.1007/s11440-015-0379-7

Cited by 34 publications

(12 citation statements)

References 20 publications

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“…The water retention properties of the considered clayey geomaterial can be certainly related to the microstructural peculiarities [22,23]. Rosone et al [24] showed that at microscopic level, compacted scaly clays present an aggregated structure with a clear double porosity network, in which two principal levels of pores can be identified: micro pores inside aggregates and macro pores between aggregates and assemblages. Aggregates are made mainly of scale fragments (which are not eliminate by compaction), even if other different particle assemblages, typical of clay compacted on the dry side of the optimum moisture content, can be observed.…”

Section: Discussionmentioning

confidence: 98%

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Water retention behaviour of compacted and reconstituted scaly clays

Rosone

Ferrari

2020

E3S Web Conf.

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The paper presents the results of an experimental research devoted to investigate the response to suction variations of a scaly clay in compacted and reconstituted conditions. Different experimental techniques (axis translation, vapour equilibrium, dew point psychrometer suction measurements) were combined in order to explore the water retention properties in a wide suction range (0 ÷ 110 MPa). Experimental results allowed to define the water retention domains for a constant reference void ratio, highlighting the significant role of the microstructure on the response of the investigated clays. In particular, the collected results showed that in the low-medium suction range, the peculiar microstructural features give to the reconstituted clay a better retention capability than the compacted clay. However, the increasing suction induces a significative volumetric shrinkage on the saturated reconstituted clay, especially when the latter is initially normally consolidated. On the other hand, quite similar retention properties were recognized in the high suction range.

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Section: Discussionmentioning

confidence: 98%

“…However, the pore size distribution in reconstituted clays is strongly affected by loading. However, Airò Farulla et al [24] highlighted that it is possible to individuate small aggregates which survived to intense remoulding procedures.…”

Section: Discussionmentioning

confidence: 99%

Water retention behaviour of compacted and reconstituted scaly clays

Rosone

Ferrari

2020

E3S Web Conf.

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“…Therefore, this test selects the lowest compaction degree (Dc = 0:90) of the silty clay of the cutting base. In various natural unsaturated soils, the matric suction range that affects the shear strength of the soil is usually 0~500 k Pa [17,[37][38][39]. Therefore, in this study, the matric suction range of the unsaturated soil consolidation test is taken as 0~500 kPa.…”

Section: Test Schemementioning

confidence: 99%

Study on Water Characteristic Curve and Shear Characteristics of Typical Unsaturated Silty Clay in Shaoxing

Tang

et al. 2021

Geofluids

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In order to probe into one simplified method to predict the shear strength of Shaoxing unsaturated silty clay, the test method combining unsaturated soil consolidation instrument and conventional direct shear instrument is used to study the shear strength, and the method is compared and verified with the results of equal suction direct shear test. The research results show that the soil water characteristic curve fitted by the measured data points and VG model has obvious stage characteristics in the range of 0~38 kPa, 38~910 kPa, and 910~10000 kPa. The shear strength of unsaturated soil measured by consolidation meter combined with conventional direct shear test is in good agreement with that measured by equal suction direct shear test in the range of 0~500 kPa. The results show that the shear strength, total cohesion, and effective internal friction angle of soil increase slightly with the increase of matric suction in the range of 0~38 kPa. When the matric suction increases from 38 kPa to 500 kPa, the shear strength and total cohesion force of the soil have similar stage characteristics with the SWCC, which first increases and then tends to be stable, while the effective internal friction angle changes slightly. Finally, taking the air-entry value as the demarcation point, an improved model of unsaturated shear strength is proposed by analyzing the error value. Compared with the measured value, the absolute value of relative error is basically kept in the range of 5%~10%, which is close to the measured value.

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“…In this study, to investigate the deformation characteristics of MSC used as subgrade materials, two set values of confining pressure 100 kPa and 200 kPa, four different dynamic stress ratios (σ d /2σ c ), and different numbers of F-T cycles were used. For the above loading parameters, they were decided by the actual stress condition of subgrade construction, and were used by some related studies [32,33]. The testing scheme on deformation characteristics of MSC is listed in Table 3.…”

Section: Testing Schemementioning

confidence: 99%

Experimental Research on Deformation Characteristics of Using Silty Clay Modified by Oil Shale Ash and Fly Ash as the Subgrade Material after Freeze-Thaw Cycles

Wei

Han

et al. 2019

Sustainability

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To achieve the purposes of disposing industry solid wastes and enhancing the sustainability of subgrade life-cycle service performance in seasonally frozen regions compared to previous research of modified silty clay (MSC) composed of oil shale ash (OSA), fly ash (FA), and silty clay (SC), we identified for the first time the axial deformation characteristics of MSC with different levels of cycle load number, dynamic stress ratio, confining pressure, loading frequency, and F-T cycles; and corresponding to the above conditions, the normalized and logarithmic models on the plastic cumulative strain prediction of MSC are established. For the effect of cycle load number, results show that the cumulative plastic strain of MSC after 1, 10, and 100 cycle loads occupies for 28.72%~35.31%, 49.86%~55.59%, and 70.87%~78.39% of those after 8000 cycle loads, indicating that MSC possesses remarkable plastic stability after 100 cycles of cycle loads. For the effect of dynamic stress ratio, confining pressure, loading frequency, and F-T cycles, results show that dynamic stress ratio and F-T cycles are important factors affecting the axial deformation of MSC after repeated cycle loads; and under the low dynamic stress ratio, increasing confining pressure and loading frequency have insignificant effect on the axial strain of MSC after 8000 loads. In term of the normalized and logarithmic models on the plastic cumulative strain prediction of MSC, they have a high correlation coefficient with testing data, and according to the above models, the predicted result shows that the cumulative plastic strain of MSC ranges from 0.38 cm to 2.71 cm, and these predicted values are within the requirements in the related standards of highway subgrades and railway, indicating that the cumulative plastic strain of MSC is small and MSC is suitable to be used as the subgrade materials.

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Shear strength of a compacted scaly clay in variable saturation conditions

Cited by 34 publications

References 20 publications

Water retention behaviour of compacted and reconstituted scaly clays

Water retention behaviour of compacted and reconstituted scaly clays

Study on Water Characteristic Curve and Shear Characteristics of Typical Unsaturated Silty Clay in Shaoxing

Experimental Research on Deformation Characteristics of Using Silty Clay Modified by Oil Shale Ash and Fly Ash as the Subgrade Material after Freeze-Thaw Cycles

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