Abstract
Resilient modulus of soil is crucial for the design of a structure on a foundation subjected to a cyclic loading (e.g., traffic load or machine vibration load). This paper conducted a series of dynamic triaxial tests of saturated silty clay, considering the influence of the factors of cyclic stress ratio (CSR), static deviatoric stress ratio (SDR), and overconsolidation ratio (OCR) on the resilient modulus and dynamic damping ratio of the soil. A cyclic loading with a form of half sine wave was used to model the traffic loading. The results showed that the soil was prone to failure under a higher SDR, even though the applied CSR was less than the critical CSR. The saturated silty clay performed a strain softening behavior and its dynamic properties deteriorated significantly when higher CSR and SDR and lower OCR were involved. Based on the test results, an empirical method with a form of exponential function was proposed to evaluate the resilient modulus of the soil, considering the combined effects of CSR and SDR and OCR. The proposed method was verified through a comparison with the test results in this study and from literatures, and some recommendations for its application were offered.
Highlights
Subgrade consisting of saturated soft soil would be softened after it goes through million times of traffic loading in service [1, 2]
Zhao et al [11] indicated that increasing the cyclic stress level and the initial deviatoric stress would accelerate the attenuation of the resilient modulus of soft soil. ian and Lee [12] performed a series of cyclic constant-volume direct simple shear loading tests on Malaysia offshore clay and found that the overconsolidated specimen reached the cyclic shear strain at failure faster than the normally consolidated specimen
A series of dynamic triaxial tests were conducted to investigate the dynamic behavior of saturated silty clay. e influences of the factors cyclic stress ratio (CSR), static deviatoric stress ratio (SDR), and overconsolidation ratio (OCR) on the resilient modulus and dynamic damping ratio were considered in the study
Summary
Subgrade consisting of saturated soft soil would be softened after it goes through million times of traffic loading in service [1, 2]. Previous studies indicated that the dynamic behavior of soil is influenced by many factors, including the amplitude and form of cyclic loading, initial static deviator stress, and overconsolidation ratio [7,8,9,10]. E influences of the factors cyclic stress ratio (CSR), static deviatoric stress ratio (SDR), and overconsolidation ratio (OCR) on the resilient modulus and dynamic damping ratio were considered in the study. Erefore, a half sine wave function was used to model the traffic loading in this study, which is characterized by three factors: loading frequency, cyclic stress ratio (CSR), and static deviatoric stress ratio (SDR). Regarded as a viscoelastic material, soil has two key parameters, resilient modulus (MR) and dynamic damping ratio (D), which can be commonly determined based on the hysteresis curves from the dynamic triaxial test. Test Results and Discussion is section mainly introduces the soil behaviors of the soil under the modeled traffic cyclic loading, and the influences
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