Shaking table tests on the seismic responses of underground structures in coral sand

Ding, Xuanming; Zhang, Yanling; Wu, Qi; Chen, Zhixiong; Wang, Chenglong

doi:10.1016/j.tust.2020.103775

Cited by 41 publications

(4 citation statements)

References 31 publications

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“…Under the action of moderate and strong earthquakes, the liquefaction degree of saturated sand soil is increased, in which the influence of the low-frequency components of ground motion must be amplified. It also supports the opinion that the degree of liquefaction can affect the dynamic response of site soil [20].…”

Section: Equivalent Dynamic Horizontal Subgrade Reaction Coefficientsupporting

confidence: 83%

“…The effects of non-uniform earthquakes should be noticed during the anti-seismic design of super-long underground structures. To investigate the seismic performances of underground structures in coral, Ding et al [20] carried out a series of shaking table tests. The dynamic test results revealed that the increasing groundwater level influenced the excess pore pressure of the coral sand and the settlement of the tunnel.…”

Section: Introductionmentioning

confidence: 99%

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Seismic Response of a Liquefiable Site-Underground Structure System

Cheng

et al. 2022

Buildings

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To study the dynamic response of a saturated sand-underground structure system subjected to earthquakes, a series of shaking table tests with a geometric scale ratio of 1/30 were conducted. Based on the experimental acceleration records of testing soil deposits, the relationship between dynamic shear stress and horizontal soil displacement was analyzed by the 1D shear beam inverse calculation method. Meanwhile, the development law of the equivalent dynamic horizontal subgrade reaction coefficient and the dynamic strain of the sidewall in the underground structure has also been discussed. The testing results indicate that the dynamic shear stress of the soil deposit under the bottom plate of the underground structure is larger than that of the soils surrounding the sidewall and above the roof plate; in addition, the soil displacement tends to decrease with the buried depth. The dynamic shear stress–displacement hysteretic loop of the soil deposits tends to be plump as the input amplitude increases. The spectral characteristics of ground motions obviously influence both the dynamic shear stress–displacement hysteretic curve and the excess pore water pressure ratio of saturated sand soil, especially under medium and strong excitations. The equivalent dynamic horizontal subgrade reaction coefficient decreases with the increase of soil depth, and the difference between the coefficient above and underneath the underground structure model can reach 7.589 MN/m3. On the contrary, the equivalent dynamic horizontal subgrade reaction coefficient decreases with the increase of the input amplitude of ground motions, and the maximum reduction ratios of the coefficient are 74.4%, 66.7%, and 47.3%, corresponding to the El-Centro, Kobe, and Wolong ground motions, respectively. The soil liquefaction has a certain effect on the equivalent dynamic horizontal subgrade reaction coefficient. In general, the dynamic strain at the top of the sidewall in the underground structure is higher than that at the bottom of the sidewall, which illustrates that the deformation of underground structures is in good agreement with the seismic deformation mode of soil deposits.

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Section: Equivalent Dynamic Horizontal Subgrade Reaction Coefficientsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Seismic Response of a Liquefiable Site-Underground Structure System

Cheng

et al. 2022

Buildings

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“…Gao et al [19] employed an extended response spectrum method for dynamic analysis of underground structures. Ding et al [20] investigated the dynamic response of underground structures in coral sand by using a series of shaking table model tests on underground structures. Zhou et al [21] investigated the dynamic response of underground structures subjected to ground motion using theoretical, experimental, and numerical methods.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on the influence of near-fault and far-fault earthquakes on a subway station with emphasis to scattering on the wave propagation

Isari,

Hadidi,

Razavi

et al. 2023

Numerical Methods in Civil Engineering

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To improve the design of surface structures built on underground structures for safety and earthquake resistance, it is necessary to study the effects of the underground structures on wave propagation scattering and surface ground acceleration. To this end, various parameters must be studied, including input motion, structure embedment, and dimensions of different subway stations. The present study focuses on these parameters by employing a nonlinear cyclic model called ARCS soil's shear modulus reduction and damping ratio increase corresponding to those given by the user. The variations in spectral ratio, affected period range, peak ground acceleration, and peak relative lateral displacement versus relative distance under near-fault and far-fault earthquakes are presented. The results indicate that different amplification or deamplification effects at different surface positions were produced at each frequency by appearing a significant influence on the dynamic behavior of ground surface, soil layers, and the surface structure when a subway station is present. A 1.3 times increase in the surface ground acceleration when subjected to far-fault earthquakes and a 1.6 times increase in the relative displacement indicated that study parameters have significant influence on the amplification ratio and scattering of wave. D

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“…In recent years, with the increasing exploitation of oil, wind and gas resources, the construction projects of marine structures are developing rapidly around the world, such as offshore wind turbines and offshore drilling platforms. In these offshore engineering, the lateral loads, result from waves, winds, etc., are primarily born by pile foundations (Bhattacharya et al 2013;Ding et al 2021;Luan et al 2020b). Noting that, on a global scale, the coral sand is distributed widely between 30°S and 30°N, such as the South China Sea and the Australia Sea, and the problems of coral sand sediment will inevitably be encountered.…”

Section: Introductionmentioning

confidence: 99%

Study on horizontal bearing characteristics of pile foundations in coral sand

et al. 2021

Self Cite

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This paper presents the horizontal bearing characteristics of piles in coral sand and silica sand from comparative experimental studies. A total of 6 model piles with different diameters are tested. The horizontal bearing capacity, deformation characteristic, bending moment, p-y curve, the change in soil horizontal pressure, as well as the particle breakage behaviour of coral sand are investigated. The results show that, in coral sand foundation, the horizontal bearing capacities of piles and the increments of soil horizontal pressures are obviously greater than those in silica sand. Accordingly, the lateral displacement, the rotation of pile head, the bending moment and the corresponding distribution depth in coral sand are significantly smaller than that in silica sand. The p-y curves indicate that the horizontal stiffness of coral sand is greater than that of silica sand. Remarkably, the breakage behaviour of coral sand is mainly distributed in the range of 10 times pile diameter depth and 5 times pile diameter width on the side where the sand is squeezed by pile. Furthermore, in coral sand, the influence of pile size is more pronounced, the squeezing force generated by pile spread farther and its influence range is larger compared to those in silica sand.

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Shaking table tests on the seismic responses of underground structures in coral sand

Cited by 41 publications

References 31 publications

Seismic Response of a Liquefiable Site-Underground Structure System

Seismic Response of a Liquefiable Site-Underground Structure System

Numerical study on the influence of near-fault and far-fault earthquakes on a subway station with emphasis to scattering on the wave propagation

Study on horizontal bearing characteristics of pile foundations in coral sand

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