Influence of seasonal freezing-thawing soils on seismic performance of high-rise cap pile foundation in permafrost regions

Guan, Jiada; Zhang, Xiyin; Chen, Xingchong; Ding, Mingbo; Wang, Wanping; Yu, Shengsheng

doi:10.1016/j.coldregions.2022.103581

Cited by 19 publications

(7 citation statements)

References 27 publications

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“…According to Equation ( 8), the dynamic elastic modulus ratio α E can be expressed as Equation (9). It is known that frozen soil is not an ideal viscoelastic material and that there will be residual deformation in every loading cycle, which exhibits an unclosed hysteretic curve, as shown in Figure 6.…”

Section: Calculation Of the Damping Ratiomentioning

confidence: 99%

“…All of this seismic activity has produced varying degrees of damage to engineering projects in cold regions, including bridges, roads, and tunnels. It can be seen that frozen soil dynamic parameters are the basic factors affecting the frozen soil-structure dynamic interaction, and are also necessary parameters in the seismic design and evaluation of engineering in cold regions [8][9][10]. Therefore, investigating the dynamic characteristics of frozen soil is very significant for the design and safe operation and maintenance of infrastructure in cold regions with frequent seismic activity and its research is more important in the value of sustainable development in cold regions.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on the Dynamic Characteristics of Frozen Silty Clay and Its Influencing Factors

Zhang

Sun

et al. 2023

Sustainability

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Frozen soils are widely distributed in the seismically active regions of northwest China. Under the background of global warming, the study of the dynamic characteristics of frozen soil is very significant for the sustainable development of engineering in cold regions. In this study, the silty clay in the Lanzhou area of northwest China is selected to investigate the dynamic characteristics and its influence factors by dynamic triaxial tests. Various influence factors were considered, including confining pressure, soil temperature, soil water content and loading frequency. The dynamic elastic modulus ratio and reference dynamic strain amplitude increase as confining pressure and soil temperature decrease, and they also increase as soil water content and loading frequency increase. With an increase in confining pressure, soil water content, loading frequency, and a decrease in soil temperature, the damping ratio decreases but the maximum dynamic elastic modulus increases. With an increase in dynamic strain amplitude, the dynamic elastic modulus ratio has a decreasing trend, while the damping ratio has an increasing trend. It was found that the dynamic behaviors are most sensitive to the soil temperature. In addition, the comprehensive influence effect of soil water content, confining pressure, soil temperature, and loading frequency on the maximum dynamic elastic modulus, maximum damping ratio, and reference dynamic strain amplitude of frozen silty clay are analyzed, and the quantitative relationships between them are established. The results can provide evidence for seismic design and safe operation and maintenance of infrastructure in cold regions.

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Section: Calculation Of the Damping Ratiomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Dynamic Characteristics of Frozen Silty Clay and Its Influencing Factors

Zhang

Sun

et al. 2023

Sustainability

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“…Currently, the study of dynamic behavior in special soils has become a hot topic in the field of geotechnical engineering, with particular emphasis on expansive soils due to their complexity, variability, and long-term potential hazards. However, the research on the dynamic behavior of expansive soils, especially regarding the dynamic pore pressure, is still relatively limited compared with other types of soils like loess [1][2][3][4] or frozen soils [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Research on the Accumulated Pore Pressure of Expansive Soil under Subway Loading

Qing,

Zhu,

Guo

et al. 2023

Buildings

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Taking the expansive soil near Hefei Xinqiao International Airport as the research subject, indoor dynamic triaxial tests were conducted to investigate the influence of different loading methods on the dynamic pore pressure of saturated remolded expansive soil on the basis of maximally simulating the real characteristics of subway loading. Furthermore, the action laws of three factors, namely intermittent loading ratio, static deviator stress, and cyclic stress ratio, on the accumulated pore pressure of saturated remolded expansive soil under intermittent subway cyclic loading were analyzed. The research results indicate that the loading method significantly affects the development trend of the accumulated pore pressure. Under similar conditions, a larger intermittent loading ratio leads to smaller accumulated pore pressure values and a slower initial development rate of pore pressure under the same cycle vibration. Increasing static deviatoric stress promotes the accumulation of pore pressure. The influence of the cyclic stress ratio is dependent on the intermittent loading ratio and does not follow a consistent pattern.

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“…Показано, что при интенсивных нагрузках для диаграмм деформирования характерны нелинейность и необратимость кривых, они зависят от скорости деформирования. Исследования пористых сред [21][22][23][24][25][26][27][28] показали существенные отличия кривых деформирования в статическом и динамическом режимах нагружения. Целью настоящей статьи является экспериментальные исследования пористых материалов в виде насыпных слоев из свинцовых и стальных шариков и получение новых резуль-татов для дальнейшего численного моделирования их влияния на защищаемые ими поверхности.…”

Section: Introductionunclassified

Experimental Studies of the Interaction of Strikers With Granular Layers of Metal Balls

Modin,

Balandin

2023

PSP

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The results of experimental studies of the impact interaction of hemispherical and conical heads with a granular layer are presented. The granular layer consists of steel and lead balls. An experimental technique of inverted experiment is used. The technique for measuring the resistance force using a measuring rod is designed to determine the integral loads at the initial penetration site. A container filled with steel or lead balls is accelerated in a gas-dynamic gun to a speed of 100-200 m/s and strikes a fixed head of a hemispherical or conical shape. The material properties of the rod are such that no plastic deformations occur in it. An elastic compression impulse is formed in the rod, which is recorded by glued strain gauges. To prevent the scattering of metal balls and parts of the container, the impact occurs in a vacuum chamber. The presented results are averaged over the number of experiments performed for each type of head. The resistance of steel ball granular media is significantly higher than that of lead ball media. The shape of the striker has a significant influence on the behavior of the resistance forces. Experimentally obtained deformation diagrams of granular layers in static and dynamic loading modes are also presented. The curves for all loading modes of lead balls are non-linear and irreversible. At high loads, not only the repacking of particles occurs, but also a strong plastic flow of the material. For steel balls in the considered load range, strong plastic flow of the material is not observed. In the future, the experimental results will be used for numerical simulation of the penetration of strikers of various shapes into granular layers of metal balls.

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Influence of seasonal freezing-thawing soils on seismic performance of high-rise cap pile foundation in permafrost regions

Cited by 19 publications

References 27 publications

Experimental Study on the Dynamic Characteristics of Frozen Silty Clay and Its Influencing Factors

Experimental Study on the Dynamic Characteristics of Frozen Silty Clay and Its Influencing Factors

Research on the Accumulated Pore Pressure of Expansive Soil under Subway Loading

Experimental Studies of the Interaction of Strikers With Granular Layers of Metal Balls

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