Unsaturated shear strength properties of a compacted expansive soil from Regina, Canada

Chowdhury, Rashedul H.; Azam, Shahid

doi:10.1007/s41062-016-0047-2

Cited by 26 publications

(10 citation statements)

References 44 publications

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“…According to Chowdhury (2013), the shear-strength increases with respect to an increase in matric suction which is defined by the angle ø b . At zero suction, ø b may assume to be the saturated-friction angle, then the ø d ecreases with the increase in matric-suction.…”

Section: Unconfined Compression Test Resultsmentioning

confidence: 99%

Experimental Study on Compressibility, Volume Changes, Strength and Permeability Characteristics of Unsaturated Bentonite-Sand Mixtures

Fattah¹,

Salim²,

Irshayyid³

2016

ETJ

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Expansive soils are generally found in arid and semiarid regions. These soils undergo volumetric changes upon wetting and drying, thereby causing ground heave and settlement problems. This characteristic causes considerable construction defects if not adequately taken care of. Solving the unsaturated soil problems needs the assessment of suction variation in time and space as a response to the variation of environmental factors such as rainfall and evaporation.To investigate the effect of the changes of the soil suction on the volume changes, expansion index, swelling pressure, shear strength and the coefficient of permeability, small scale experiments were conducted using pure bentonite and the bentonite mixed with sand in proportion of: 30%, 40% and 50% at different initial water contents and dry unit weights was chosen from the compaction curves. The study shows that the swelling-potential, swellingpressure, the soil-suction, the soil-strength and the coefficient of permeability are affected by the initial-conditions (water-content and dry-unit weight), where all these parameters except the permeability-coefficient marginally decrease with the increase in soil-water content, while the coefficient-of permeability increases with increasing the water-content.

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Section: Unconfined Compression Test Resultsmentioning

confidence: 99%

Experimental Study on Compressibility, Volume Changes, Strength and Permeability Characteristics of Unsaturated Bentonite-Sand Mixtures

Fattah¹,

Salim²,

Irshayyid³

2016

ETJ

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“…5 presents the SWCC given by [26] which was estimated using equation given by [27]. Properties of Regina clay are summarized from Vu and Fredlund (2004) [28] on Regina clay. In this example problem, the interface friction angle with respect to net normal stress (δ'), the interface friction angle with respect to matric suction ( b ) and interface cohesion (ca') is 60% of the internal friction angle of soil with respect to net normal stress ('), soil internal friction angle with respect to matric suction ( b ) and soil cohesion (c'), respectively.…”

Section: Example Problemmentioning

confidence: 99%

Load-deformation Analysis of a Pile in Expansive Soil upon Infiltration

Liu¹,

Vanapalli²,

Ba³

2017

Proceedings of the 2nd World Congress on Civil, Structural, and Environmental Engineering

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Piles are widely used as foundations in regions with expansive soil deposits to safely carry loads from the superstructure to the soil without undergoing unacceptable deformations. These foundations are typically designed assuming that that the soil is in a state of saturated condition extending conventional soil mechanics principles. However, the soil surrounding the pile in expansive soils is typically in an unsaturated state. Due to this reason, the mechanical behaviour of the pile is significantly influenced by matric suction. In this paper, the pile load transfer model proposed by Zhang and Zhang (2012) is modified by taking account of the influence of matric suction on the pile-soil interface shear strength for estimating the load-deformation behaviour. In addition, an algorithm is developed for estimating the load-deformation analysis of a single pile in expansive soils, taking account of infiltration conditions. An example problem is presented for highlighting the influence of infiltration on the load settlement behavior of a single pile in Regina clay, which is a typical expansive soil from Canada.

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“…China encountered the destructive problem of expansive soil in the Chengdu-Chongqing Railway project for the first time in the 1950s [17]. According to previous railway construction practices, the serviceability rate of existing railway subgrades in expansive soil region is only 25% [18]. Initially, estimated global economic loss due to expansive soil subgrade projects exceeded 10 billion dollars every year [19].…”

Section: State Of the Artmentioning

confidence: 99%

Experimental Study on the Dynamic Features of Cement-Stabilized Expansive Soil as Subgrade Filling of Heavy Haul Railway

Xu¹,

Zhao²,

Yali³

et al. 2017

JESTR

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As a core layer of heavy haul railway subgrade, cement-stabilized expansive soil filling directly bears a hundred million times of repeated traffic load action, and its dynamic features under repeated dynamic load action determine subgrade working performances. However, relatively few studies focus on the dynamic features of cement-stabilized expansive soil by combining the load features of heavy haul railway. Under the engineering background of the stabilized expansive soil subgrade of the Menghua (Haolebaoji-Ji'an) heavy haul railway, a dynamic triaxial test under the condition of sustained vibration was conducted in this study to explore the laws of the dynamic features of cement-stabilized expansive soil under the influence of train load, including different dynamic stress values, confining pressures, and vibration frequencies. Change rules of parameters, such as dynamic strength, critical dynamic stress, dynamic elasticity modulus, and damping ratio of cement-stabilized expansive soil, were analyzed and compared with those of remolded plain expansive soil, lime-stabilized expansive soil, and coarse-particle filling. Results show the following: Compared with remolded plain expansive soil, the dynamic shear strength and modulus of cement-stabilized expansive soil increase by two to three times, and its critical dynamic stress increases by five to six times. Under the same conditions, the mean critical dynamic stress value of cement-stabilized expansive soil is 1.5-1.7 times greater than that of cement-containing coarse-particle filling, and the maximum value is 1.2 times greater than that of lime-stabilized expansive soil. Within a small strain range, the decreasing amplitude of dynamic modulus with strain reaches 70%, whereas the increasing amplitude of damping ratio is 80%. The working performance of cement-stabilized expansive soil used as subgrade filling of heavy haul railway satisfies requirements. The conclusions of this study provide a theoretical reference for the promotion and application of cement-stabilized expansive soil in practical heavy haul railway projects.

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Unsaturated shear strength properties of a compacted expansive soil from Regina, Canada

Cited by 26 publications

References 44 publications

Experimental Study on Compressibility, Volume Changes, Strength and Permeability Characteristics of Unsaturated Bentonite-Sand Mixtures

Experimental Study on Compressibility, Volume Changes, Strength and Permeability Characteristics of Unsaturated Bentonite-Sand Mixtures

Load-deformation Analysis of a Pile in Expansive Soil upon Infiltration

Experimental Study on the Dynamic Features of Cement-Stabilized Expansive Soil as Subgrade Filling of Heavy Haul Railway

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