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A dynamic strength criterion for frozen sulfate saline silty clay under cyclic loading
Abstract The strength properties of frozen saline soils under cyclic loading are more complex than those of unfrozen soils and frozen salt-free soils due to the existence of salt crystals in soil matrix. In this paper, a serious of tri-axial cyclic loading tests are conducted for frozen sulfate saline silty clay (FSSSC) with different Na2SO4 contents under different confining pressures and loading dynamic stress ratios at the temperature of −6 °C, respectively. The experimental results illustrate that the dynamic strength of FSSSC decreases with the increase of axial strain. The critical state line of FSSSC under cyclic loading is moving constantly. The dynamic critical state lines of FSSSC with different salt contents are different under same axial strains. The dynamic friction angle of FSSSC is related to salt content, loading dynamic stress ratio and confining pressure. Based on the experimental results, a dynamic strength criterion for FSSSC under cyclic loading is proposed, and the method of determining dynamic strength parameters is given. This strength criterion not only can reflect the effect of loading dynamic stress ratio and salt content on dynamic strength, but also can describe the influence of high confining pressure on dynamic strength.
Highlights The dynamic strength properties of frozen saline soil are investigated. Locomotive critical state line function of frozen saline soil under cyclic loading is given. A dynamic strength criterion for frozen saline soil under dynamic loading is proposed. The method of determining dynamic strength parameters is presented. The criterion can reflect the effect of salt on dynamic strength of frozen saline soil.
A dynamic strength criterion for frozen sulfate saline silty clay under cyclic loading
Abstract The strength properties of frozen saline soils under cyclic loading are more complex than those of unfrozen soils and frozen salt-free soils due to the existence of salt crystals in soil matrix. In this paper, a serious of tri-axial cyclic loading tests are conducted for frozen sulfate saline silty clay (FSSSC) with different Na2SO4 contents under different confining pressures and loading dynamic stress ratios at the temperature of −6 °C, respectively. The experimental results illustrate that the dynamic strength of FSSSC decreases with the increase of axial strain. The critical state line of FSSSC under cyclic loading is moving constantly. The dynamic critical state lines of FSSSC with different salt contents are different under same axial strains. The dynamic friction angle of FSSSC is related to salt content, loading dynamic stress ratio and confining pressure. Based on the experimental results, a dynamic strength criterion for FSSSC under cyclic loading is proposed, and the method of determining dynamic strength parameters is given. This strength criterion not only can reflect the effect of loading dynamic stress ratio and salt content on dynamic strength, but also can describe the influence of high confining pressure on dynamic strength.
Highlights The dynamic strength properties of frozen saline soil are investigated. Locomotive critical state line function of frozen saline soil under cyclic loading is given. A dynamic strength criterion for frozen saline soil under dynamic loading is proposed. The method of determining dynamic strength parameters is presented. The criterion can reflect the effect of salt on dynamic strength of frozen saline soil.
A dynamic strength criterion for frozen sulfate saline silty clay under cyclic loading
Zhao, Yanhu (author) / Lai, Yuanming (author) / Zhang, Jing (author) / Liao, Mengke (author)
2020-02-26
Article (Journal)
Electronic Resource
English
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