Properties of Drained Shear Strength of Expansive Soil Considering Low Stresses and Its Influencing Factors

Xiao, Jie; Yang, Heping; Zhang, Junhui; Tang, Xianyuan

doi:10.1007/s40999-017-0268-6

Cited by 28 publications

(24 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When the slope is in the limit equilibrium state, external force power should be equal to internal energy dissipation power in the slope failure area. A gradual transition to the limit equilibrium state through repeated strength reduction is needed for the slope under the nonlimit equilibrium state [42,43].…”

Section: Strength Reduction Calculationmentioning

confidence: 99%

Upper Bound Limit Stability Analysis for Soil Slope with Nonuniform Multiparameter Distribution Based on Discrete Algorithm

Wang

Yang

2020

Advances in Civil Engineering

View full text Add to dashboard Cite

Slope stability analysis is a core issue in geotechnical engineering. This paper proposes a method of upper bound limit stability analysis for a slope with multiparameter coordinated variation based on the comprehensive consideration of the nonuniform distribution of slope soil parameters. This method starts from the perspective of energy balance, establishes a slope failure mechanism which meets velocity separation requirements, deduces its calculation formula for external force power and internal energy dissipation power, develops a cycle program for the most dangerous slip surface searching and stability coefficient calculation through computer programming technology, and finally forms a calculation method of upper bound limit stability analysis for the soil slope with nonuniform multiparameter distribution. At the same time, this method takes a dump slope in an open-pit mine as the engineering background, considers the nonuniformity of density, cohesion, and internal friction angle of the slope soil under subsidence, applies upper bound limit analysis to analyze the slope stability, and evaluates the accuracy of analysis results by using the residual thrust method. The results show that upper bound limit analysis has highly accuracy in stability coefficient calculation; compared with the residual thrust method, the stability coefficient calculation result by upper bound limit analysis is a strict upper bound solution, and the calculation error is easy to be estimated and eliminated. Simultaneously, the most dangerous slip surface obtained by upper bound limit analysis can fully satisfy the velocity separation requirement and has a greater engineering reference value.

show abstract

Section: Strength Reduction Calculationmentioning

confidence: 99%

Upper Bound Limit Stability Analysis for Soil Slope with Nonuniform Multiparameter Distribution Based on Discrete Algorithm

Wang

Yang

2020

Advances in Civil Engineering

View full text Add to dashboard Cite

show abstract

“…Attributed to the montmorillonite and its mixed layer mineral, the expansive soils exhibit large volume change when the upper load and/ or their moisture content varies [2][3][4]. If this volume change is restricted, the remarkable swelling pressures can be created [5][6][7][8], resulting in severe damage to surrounding structures [9][10][11][12]. With the water content increasing to equilibrium water content due to capillary effect and water migration through the cracks in pavements, the expansive soils as underlay in pavement not only swell vertically but also swell laterally.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Swelling Behavior and Its Anisotropic Evaluation of Unsaturated Expansive Soil

Liu

Zhang

Liu

et al. 2021

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

Evaluation of swelling behavior is important for designing structures in expansive soils areas, especially for highway that the swelling pressure generated upon pavement and retaining structures in both vertical and horizontal directions due to infiltration. In this study, modification was made on unsaturated consolidation oedometer to provide synchronized measurement of vertical swelling strain (VSS) and lateral pressure (LP) of expansive soil under constant net normal stress and controlled matric suction. Vertical swelling (VS) test and lateral swelling (LS) test were conducted to investigate the anisotropic swelling behavior. The influence of mean net stress and net stress ratio on VSS was investigated, and the anisotropic swelling behavior of unsaturated expansive soil was characterized using anisotropic swelling ratio. The results show that the VSS nonlinearly decreased as the mean net stress increased and increased as the net stress ratio increased. The expansive soil would rapidly enter the passive state due to lateral swelling pressure under relatively low surcharge, with major principal axis rotating from vertical direction to lateral direction, which advances the possibility of passive failure for light retaining structures. The anisotropic swelling behavior objectively exists and varies with matric suction and net normal stress, which should not be ignored for engineering application.

show abstract

“…Expansive soil generally refers to a special type of soil rich in montmorillonite and other hydrophilic clay minerals (Calik and Sadoglu 2014;Mehta and Sachan 2017;Xiao et al 2018). In seasonal wet-dry (WD) environments, clay minerals in the soil repeatedly swell and shrink, resulting in damage to the soil structure and degradation in soil strength along with a series of engineering problems, such as slippery embankments, drifting house foundations, and shoulder heaving (Alonso et al 2005;Erguler and Ulusay 2003;Ng et al 2003;Petry and Little 2002).…”

Section: Introductionmentioning

confidence: 99%

“…Among them, the shear strength has attracted much attention because of its critical role in slope stability evaluation and engineering Responsible Editor: Zeynal Abiddin Erguler design (Huang et al 2019;Liu et al 2021b;Wang et al 2019;Xu et al 2018;Yan et al 2021). The influence of the amplitude and velocity of the WD cycles on the shear strength of various clays has been discussed (Kong et al 2017b;Ma et al 2020;Xiao et al 2018). However, the influence of the number of WD cycles on soil shear strength parameters has not been reached a consensus yet.…”

Section: Introductionmentioning

confidence: 99%

“…However, the influence of the number of WD cycles on soil shear strength parameters has not been reached a consensus yet. Regarding cohesion, a rapid decrease is often observed, while the friction angle is found to be decreased, unchanged, or increased (Hou et al 2013;Huang et al 2019;Xiao et al 2018). In addition, several studies proved that the physical and hydraulic properties of expansive soils are closely related to the composition of its clay minerals, while its mechanical properties are more dominated by structural characteristics (Burton et al 2015;Li and Yang 2017).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Shear strength and damage characteristics of compacted expansive soil subjected to wet–dry cycles: a multi-scale study

Liu

Jing

2021

Arab J Geosci

View full text Add to dashboard Cite

In expansive soil regions, engineering geological disasters frequently occur in wet-dry (WD) environments, which are inseparable from the degradation of soil shear strength and structural damage. This study attempts to assess the underlying mechanisms of shear strength degradation and micro-and mesoscale damage to expansive soil under WD cycles. Recompacted specimens were subjected to several WD cycles, then triaxial shear, nuclear magnetic resonance, and scanning electron microscopy tests were performed. Moreover, the influence of the WD cycles on the shear strength of expansive soil was evaluated. The state-of-the-art image processing and analysis techniques were combined to quantitatively investigate the evolution of the soil micro-and mesostructural characteristics. The results reveal that the deterioration of soil shear strength is primarily embodied in the initial 3 WD cycles, and is mainly due to the severe loss of cohesion (about 51.69%) during this period. Soil meso-cracks were formed under the combined effects of swelling potential and tensile stress, which mainly occurred in three stages: initiation stage (1-2 cycles); propagation stage (3-4 cycles); equilibrium stable stage (5-6 cycles). Indeed, the strength and average width of cracks were increased to varying degrees, which degraded the structural integrity of the soil. In addition, the microstructure of the soil was deeply affected by WD cycles; the total volume of pores increased significantly, the particles roundness decreased marginally, and an isotropic particles orientation was achieved as a whole with local preferential orientation (depolarization). The deterioration of shear strength of the expansive soil may be attributed to alterations in humidity, which causes the clay minerals in the soil to swell and shrink repeatedly, thereby yielding the irreversible fatigue damage of microstructure and propagation of meso-cracks. This work sheds light on the properties of shear strength evolution and mechanisms of structural damage in expansive soils in semi-arid regions.

show abstract

Properties of Drained Shear Strength of Expansive Soil Considering Low Stresses and Its Influencing Factors

Cited by 28 publications

References 26 publications

Upper Bound Limit Stability Analysis for Soil Slope with Nonuniform Multiparameter Distribution Based on Discrete Algorithm

Upper Bound Limit Stability Analysis for Soil Slope with Nonuniform Multiparameter Distribution Based on Discrete Algorithm

Experimental Study on Swelling Behavior and Its Anisotropic Evaluation of Unsaturated Expansive Soil

Shear strength and damage characteristics of compacted expansive soil subjected to wet–dry cycles: a multi-scale study

Contact Info

Product

Resources

About