An elastoplastic constitutive model for frozen saline coarse sandy soil undergoing particle breakage

Chang, Dan; Lai, Yuanming; Yu, Fan

doi:10.1007/s11440-019-00775-0

Cited by 28 publications

(5 citation statements)

References 72 publications

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“…During the shearing process, the axial strain rate was chosen as 1:67 × 10 −4 s −1 . The main testing procedures of sample preparation and triaxial test can be referred to Chang et al [41].…”

Section: Test Resultsmentioning

confidence: 99%

A Nonlinear Strength Criterion of Frozen Saline Sandy Soil at High Pressures

et al. 2022

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The strength of frozen saline soil is influenced by various factors, such as confining pressure, salt content, and temperature. To investigate the influences of these factors on strength parameters, a series of triaxial tests were performed for frozen saline samples. According to the test results, as the mean principal stress increases, the failure strength increases firstly and then reaches a peak value, followed by a decreasing tendency. The pressure corresponding to ice melting is higher for frozen samples at a lower temperature. A strength function, which consists of cohesion and friction components, is developed in p ‐ q plane. Then, the relationships between temperature and strength parameters are given by fitting the test data. The envelope between those for the SMP and von Mises criteria is employed to describe the strength properties in π plane. By comparing the predicted data with test results, the developed strength criterion can well reproduce the strength variation of frozen sandy samples considering the effects of confining pressure, salt content, and temperature.

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Section: Test Resultsmentioning

confidence: 99%

A Nonlinear Strength Criterion of Frozen Saline Sandy Soil at High Pressures

et al. 2022

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“…In the process of triaxial shear, particles near the shear zone, where the corresponding failure occurs in the sample, will have sliding, biting, and friction effects, 39 and crushing phenomenon may also occur at the sharp corners of the particles under a large confining pressure. 40 These factors explain the shear strength. Consequently, the shear strength can be considered to comprise the occlusal force, friction, and crushing force between the particles.…”

Section: Establishment and Analysis Of A Mesoparticle Calculation Modelmentioning

confidence: 99%

Mechanism of strength degradation of frozen soil–rock mixture under temperature rise‐induced particle ice film ablation

Tang

Zheng

et al. 2023

Permafrost & Periglacial

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The mesoscale effect of climate change and engineering activities on a superficial frozen soil–rock mixture (FSRM) in regions is complex. The decrease in strength caused by particle ice film ablation under temperature rise has various effects, such as upper subgrade settlement deformation. However, the internal mechanism of FSRM strength degradation remains unclear. Triaxial and nuclear magnetic resonance tests on FSRM were performed at various temperatures to clarify the mechanism of FSRM internal degradation. The results show that the strength, cohesion, and internal friction angle of FSRM decrease with increasing temperature, and the attenuation is significant in the range of −5 to 0°C. The change in ice–water content can be divided into three stages (i.e., freezing, phase transformation, and complete melting). In the three stages, the maximum free water is only 24%, while the maximum bound water is 100% above 0°C. Based on the microscopic test results, a mesoscopic calculation model for FSRM particles was developed. It was found that the work between particles is consistent with the law of strength degradation, and the friction function by particles gradually changes to bite work with increasing temperature. By introducing the strain energy theory, the strain energy generated by particle shear work is considered the key index to reflect FSRM strength. The particle ice film locking effect is weakened under temperature rise, and the increase in water weakens the strain energy generated by the work of the bite friction between particles during the shear process. At the macro level, the strength of FSRM deteriorates.

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“…Therefore, it is necessary to analyze the effective proportion of the ramming energy that can be expressed by the efficiency coefficient η. The value of η is generally in the range of 0.5-0.9 [23][24][25][26][27].…”

Section: Motion Model Of Test Rammermentioning

confidence: 99%

Research on mechanical characteristics and energy dissipation of traditional ramming technology

Pei

Hou

et al. 2022

Herit Sci

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The ramming technique is a traditional method used to improve the compactness of soil with impact and vibration energy. Based on the measured data of ramming force transmission and dissipation, this study reveals the mechanism of energy transfer and dissipation of single-layer ramming as well as the law of variation with ramming quality, laying thickness, and ramming times. It also establishes the ramming model and empirical formula of ramming quality, laying thickness, and ramming times, introduces the ramming layer changes associated with the constitutive relationship (elastic to elastoplastic parts) as a function of ramming times, and determines the influence depth and horizontal range based on real-time data monitoring. It was found that as the mass of the rammer increases, the range of influence of the impact stress inside the earth also increases proportionally, and this effect is more pronounced vertically. However, the dissipation rate of energy in horizontal direction is much greater than in the vertical direction. The traditional stacked ramming technique of “chong hai wo, hang yin ding” can effectively eliminate the defects of horizontal reversal upwelling impact and unevenness of the ramming layer during the ramming process. The research results provide a theoretical basis for evaluating the quality of the traditional ramming technique.

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An elastoplastic constitutive model for frozen saline coarse sandy soil undergoing particle breakage

Cited by 28 publications

References 72 publications

A Nonlinear Strength Criterion of Frozen Saline Sandy Soil at High Pressures

A Nonlinear Strength Criterion of Frozen Saline Sandy Soil at High Pressures

Mechanism of strength degradation of frozen soil–rock mixture under temperature rise‐induced particle ice film ablation

Research on mechanical characteristics and energy dissipation of traditional ramming technology

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