Simplified effective stress simulation of shear wave propagation in saturated granular soils

Zhao, Kai; Wang, Q.; Chen, Q.; Hu, Zhuang; Chen, G.

doi:10.1680/jgele.19.00023

Cited by 23 publications

(8 citation statements)

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“…The Davidenkov viscoelastic constitutive model was used to describe the dynamic nonlinear characteristics of the soil. We implemented the Davidenkov model in Abaqus as a user-defined-model routine by using Fortran (Zhao et al, 2021). The constants A, B, and r 0 of the Davidenkov model can be calibrated by the modulus reduction and damping curves obtained by conventional cyclic laboratory tests.…”

Section: Numerical Coupling Modeling Numerical Model Parameters Of Building and Foundationmentioning

confidence: 99%

Structural Vibration Analysis of Historical Drum Tower Structure Caused by Underground Train Running

Zhou¹,

Bai

Wang

et al. 2022

Front. Earth Sci.

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The vibration induced by underground metro operation could have significant impacts on the safety of building structures. In this study, the dynamic response of the Nanjing Drum Tower affected by the metro line four operation was investigated by a three-dimensional FEM coupling train-track-tunnel-foundation-soil-basement–Drum Tower model performed on a 64 CPU parallel computing cluster platform. The results show that the vertical vibration caused by the subway operation has a more serious impact on the historical structure of the Drum Tower than the horizontal vibration. The vertical vibration attenuates rapidly from the basement bottom to the top of the tower. The horizontal vibration amplifies along the height of the historical building. The truss roof significantly weakens the vibration. As the speed of the train increases, the amplitude of horizontal and vertical vibration increases gradually from the bottom to the roof of the Drum Tower despite a relatively smaller increase for the horizontal vibration. As for the double-track operation case, the vertical vibration amplitude is much greater than that for the single-track operation, and no significant difference is observed in the horizontal direction. The amplitudes of horizontal vibration velocity for the basement and Drum Tower are 0.131 and 0.060 mm/s, respectively.

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Section: Numerical Coupling Modeling Numerical Model Parameters Of Building and Foundationmentioning

confidence: 99%

Structural Vibration Analysis of Historical Drum Tower Structure Caused by Underground Train Running

Zhou¹,

Bai

Wang

et al. 2022

Front. Earth Sci.

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show abstract

“…e variation of G/G max against c directly reflects the nonlinear of the stress-strain relationship of soils under dynamic loads [17]. To investigate the variations in the decay characteristics of the G values of the silty clay and silt with increasing c at different H, the normalized dynamic shear modulus G, i.e., G/G max , was used to examine the silty clay and silt at different depths.…”

Section: Variation In the Dynamic Shear Modulus Ratio (G/g Max ) With Soil Depthmentioning

confidence: 99%

Experimental Study of the Engineering Mechanical Properties of the Foundation Soil for Offshore Wind Power Platforms

Fang

Lv²,

Zhou³

et al. 2021

Shock and Vibration

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Most of the coastal beach zone in the world is rich in wind energy reserves and has great potential for offshore wind power development. However, the sedimentary environment in the coastal area is complex and changeable, and the nature of the foundation soil of offshore wind power platforms is weak and complex, which is quite different from that in the land areas. In order to systematically study the mechanical properties of marine foundation soils, a series of geotechnical tests are carried out on representative undisturbed seabed soils, such as basic laboratory geotechnical tests, bender element tests, undrained triaxial shear tests, and resonance column tests. The test results show that shear wave velocity (Vs) of marine silt and silty clay increases linearly with the buried depth; the stress-strain relationship curves of silty clay and silt present two different modes of development: strain hardening and strain softening, the undrained shear strength (Sd) of the two types of marine soils decreases with the increase of the void ratio (e), and both present a good single correlation. Based on the relationship between Sd and Vs from the laboratory test of disturbed seabed soils, an undrained strength evaluation method of undisturbed seabed soils under the current stratum conditions incorporating in situ shear wave velocity is established. The dynamic shear modulus (G) in the various strain ranges of undisturbed silty clay and silt increases regularly with the buried depth (H). Meanwhile, the maximum dynamic shear modulus (Gmax) linearly increases with the increase of H, whereas the attenuation relationship of G decreases with the increase of H. The prediction method of G based on buried depth is established with high accuracy.

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“…Based on the Biot dynamic consolidation theory, Zhao et al [10] proposed a cyclic characterization framework for the elastoplastic consolidating feature of the liquefiable seabed around immersed tunnels under combined loads. Furthermore, to comprehensively analyze the seismic performance of immersed tunnels in the liquefiable seabed, a simplified soil hysteresis model for saturated sand [11] and a fully coupled flow deformation model [12] were also recommended. On the basis of the Anatasopoulos method [13], Zhang [14] established a spatial nonlinear model with a consideration of temperature and prestress to synthetically study the seismic performance of an immersed tunnel.…”

Section: Introductionmentioning

confidence: 99%

Seismic Behavior of Shear Keys Enhanced with Novel Energy Absorption Devices in Immersion Joints Based on Pseudo-Static Tests

Cheng

Jing

et al. 2022

Materials

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Shear keys are usually installed as crucial shear-resistant members of an immersion joint; thus, the mechanical behavior of the shear keys, especially under earthquake loading, deserves more attention. This paper presents a novel arc-shaped energy absorption device developed for shear keys. In order to verify the seismic performance of shear keys strengthened by the arc-shaped energy absorption devices, a series of pseudo-static tests were conducted, in which different axial pressures (300 kN, 400 kN) were also taken into consideration. The testing results indicated that failure mode of the shear key enhanced by the energy absorption devices was a synthesis of the oblique shear failure of the rubber blankets, the buckling of the energy absorption devices, and the concrete fracture of the shear key. In view of load-displacement hysteretic curves of testing specimens, loops of the reinforced shear keys were plumper than those from a traditional shear key. In addition, the load-bearing capacity (cracking load, yield load, peak load, and failing load) differences of the shear keys with and without energy absorption devices reinforcement under the same axial pressure were 33.0%, 36.7%, 26.0%, and 23.6%, respectively. The maximum equivalent viscous coefficient values of the shear keys with and without energy absorption devices reinforcement were 0.37, 0.38, and 0.32, respectively. The arc-shaped energy absorption devices can contribute to the hysteretic behavior of the shear keys. However, the axial pressure had a positive influence on the load bearing capacity, accumulated energy absorption capacity, and initial stiffness of the shear keys. In contrast to that, the axial pressure had negative influence on ductility ratio of the reinforced shear keys (equivalent viscous coefficient values of two enhanced shear keys were roughly equal). A reasonable stiffness scheme of an energy absorption device should be given attention during the anti-seismic design of an immersion joint. The study can provide scientific support for further study on the seismic responses of immersion joints and promote the application of earthquake control technology in immersed tunnels.

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Simplified effective stress simulation of shear wave propagation in saturated granular soils

Cited by 23 publications

References 0 publications

Structural Vibration Analysis of Historical Drum Tower Structure Caused by Underground Train Running

Structural Vibration Analysis of Historical Drum Tower Structure Caused by Underground Train Running

Experimental Study of the Engineering Mechanical Properties of the Foundation Soil for Offshore Wind Power Platforms

Seismic Behavior of Shear Keys Enhanced with Novel Energy Absorption Devices in Immersion Joints Based on Pseudo-Static Tests

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