Experimental Study on Dynamic Characteristics of Marine Soft Clay in North China

Zhao, Yu; Du, Xi; Xiong, Bo; Zhang, Deying

doi:10.2112/si83-079.1

Cited by 4 publications

(4 citation statements)

References 6 publications

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“…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]. 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.…”

Section: Introductionmentioning

confidence: 99%

Empirical Method for Evaluating Resilient Modulus of Saturated Silty Clay under Cyclic Loading

Zhang

Chen

et al. 2020

Advances in Civil Engineering

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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.

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Section: Introductionmentioning

confidence: 99%

Empirical Method for Evaluating Resilient Modulus of Saturated Silty Clay under Cyclic Loading

Zhang

Chen

et al. 2020

Advances in Civil Engineering

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“…With respect to the dynamic response of soft clay, many scholars have concentrated on the cyclic deformation and deformation mechanism of soils under cyclic loading considering many factors, such as the waveform, number of cycles (N), vibration frequency (f ), cyclic stress ratio (CSR), and confining pressure (σ) [8,9]. Zhao et al conducted cyclic triaxial tests on soft marine clay and revealed that increased cyclic stress levels and the application of the initial deviatoric stress accelerate the attenuation of the dynamic modulus [10]. Shen et al carried out a series of undrained shear tests using a hollow cylinder apparatus and demonstrated the variation in dynamic deformation due to vibrations under different dynamic stress ratios [11].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Deformation Characteristics of Tianjin Clays under Coupled Dynamic Stress and Seepage Fields

Lei

Feng

Jia

et al. 2019

Advances in Civil Engineering

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The causes, prevention, and control of clay disasters are of great concern in practical engineering applications. Recently, due to unprecedented economic development, increasing numbers of tunnels and subgrades of tidal flat areas have been built in Tianjin, China. Soft soil ground not only bears the vibration load during operation and construction but also receives seepage effects caused by the bursting of pipelines and variations in groundwater levels. Under the coupling action of dynamic and seepage loads, large settlement can occur in soft soil since the deformation is related to both cyclic stress and seepage. Therefore, it is significant to understand the dynamic deformation characteristics of soil to ensure the safety of engineering applications. In this study, a series of laboratory cyclic triaxial tests were conducted to study the deformation behaviours of Tianjin clays under coupled cyclic stress and seepage fields. To simulate the seepage field, water pressure is applied at the bottom of the specimen, and the water can be drained from the top of the specimen to form a head difference in the specimen during the tests. The effects of the seepage pressure, cyclic stress ratio (CSR), and a number of cycles (N) on the hydraulic conductivity, axial deformation, hysteresis curve and dynamic modulus of Tianjin clays were systematically investigated. The laboratory results show that the hydraulic conductivity (k) decreases with the increasing seepage pressure, CSR, and N, and its range is from 4.6 × 10−8 cm/s to 7.4 × 10−8 cm/s. The axial deformation of the soil increases with increasing CSR and seepage pressure. With an applied water pressure of 150 kPa at the bottom of the specimen and a CSR of 0.3, the maximum cumulative plastic strain reaches 4.78%, increasing by 53.2% compared with a CSR of 0.1. The hysteresis curve gradually becomes denser or thinner with increasing CSR and N; the hysteretic curve tends to a straight line for N of 5,000. The dynamic modulus increases with increasing N and depends on the CSR and seepage pressure. Empirical equations are suggested for calculating the dynamic modulus with different CSR values and seepage pressures. The results of this study can provide reference parameters for the construction and design of tunnels and subgrades of tidal flat areas in clay strata under the influence of water environments.

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“…Zhou Xiaosheng [21] conducted experimental research on remolded expansive soil, and reached the conclusion that there is no significant regular change in the dynamic strain, dynamic elastic modulus, and damping ratio of the soil when the frequencies are 1 Hz and 2 Hz. Zhuang Jiahuang [22] determined the frequency of cyclic loading as 1 Hz based on measured data. Therefore, the influence of frequency on the dynamic loading tests for expansive soil is no longer considered, and a uniform value of 1 Hz is adopted.…”

Section: Determination Of Parameters Related To Subway Loads (1) Load...mentioning

confidence: 99%

Research on the Accumulated Plastic Strain of Expansive Soil under Subway Loading

Zhu,

Guo,

Cheng

et al. 2023

Applied Sciences

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Expansive soil near Hefei Xinqiao International Airport was selected as the research focus. The effects of different loading modes on the dynamic strain of the saturated remodeled expansive soil was investigated by indoor dynamic triaxial tests and the effect of three factors, intermittent loading ratio, static deviatoric stress, and cyclic stress ratio, on the accumulated plastic strain of saturated remodeled expansive soil under intermittent subway cyclic loading was analyzed. Finally, the corresponding accumulated plastic strain calculation model was established based on the test results. The research results show that the loading modes do not affect the overall development mode of the strain and, under intermittent loading, the strain tends to be more stable. Under intermittent loading, when the number of cycles is the same, the larger the intermittent loading ratio, the smaller the accumulated plastic strain. The effect of static deviatoric stress and cyclic stress ratio on strain accumulation is significant. Based on the hyperbolic model, an accumulated plastic strain calculation model related to the number of cycles of remolded expansive soil under the load of the Hefei subway was proposed, which has a certain reference significance for the design, safety assessment, and safe operation of the Hefei subway.

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Experimental Study on Dynamic Characteristics of Marine Soft Clay in North China

Cited by 4 publications

References 6 publications

Empirical Method for Evaluating Resilient Modulus of Saturated Silty Clay under Cyclic Loading

Empirical Method for Evaluating Resilient Modulus of Saturated Silty Clay under Cyclic Loading

Experimental Investigation of the Deformation Characteristics of Tianjin Clays under Coupled Dynamic Stress and Seepage Fields

Research on the Accumulated Plastic Strain of Expansive Soil under Subway Loading

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