Thin Layer Method Simulation of Near Source Ground Motions Due to Discretized Dislocations in Layered Soils

Takemiya, Hirokazu; Goda, Kazuya

doi:10.2208/jscej.2000.640_89

Cited by 2 publications

(3 citation statements)

References 11 publications

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“…In the above low frequency range or below the peak, a significant response reduction results as the distance increases off the moving axis. This fact has been already pointed out in [Takemiya and Goda 2000] as a consequence of the cut-off frequency to be determined by the stratum depth. P n2 , P n1 (kN) 181.5, 180.0 122.5, 122.5 122.5, 122.5 122.5, 122.5 117.5, 160 a n (m) 2.9 2.9 2.9 2.9 2.9 b n (m) 6.6 14.8 14.8 14.8 11.6 L n (m) 17.17 24.4 24.4 24.4 22.17 Table 1.…”

Section: 2mentioning

confidence: 57%

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Time-domain thin layer method for computing transient response due to sudden/moving loads

Takemiya

2008

JOMMS

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In this study, the author applied the thin-layer method (TLM) for developing explicit time domain solutions for the ground response due to impulse and moving loads. The Fourier and Laplace transforms for space and time, respectively, are applied to derive the transformed domain solution that satisfies given boundary conditions. The eigenvalue decomposition in the Laplace parameter domain and the discrete wave number superposition for the horizontal wave field description lead to an accurate and efficient strategy for a stable time-space domain solution. Some demonstrations are given: The first example is a fundamental problem relating to interpretation of the causal transient responses of the P, S, and Rayleigh waves due to an impact loading. The second example is also fundamental, and treats the description of a compound wave field produced by a single moving load, detailing the kinematic as well as the inertial effects, with the speed being an important parameter. The third example is an engineering application that demonstrates the track response due to train passage in order to interpret the wave generation in ground by the high-speed passage. A comparison to measurement data is presented for validation.

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Section: 2mentioning

confidence: 57%

“…To fulfill the required causality of wave propagation, Takemiya and Goda [2000] applied the Laplace transform instead in the seismic fault rapture problem.…”

Section: Introductionmentioning

confidence: 99%

Time-domain thin layer method for computing transient response due to sudden/moving loads

Takemiya

2008

JOMMS

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“…After 1950, subway trains were regarded as moving loads, and the ideal elastic wave theory was used for most studies. Takemiya et al [9] proposed several different types of mechanical models for the vibration excitation of subway trains. Nelson et al [10] constructed a vibration expression that decays with distance based on the elastic layered ground model.…”

Section: Introductionmentioning

confidence: 99%

Deformation Mechanism of Underlying Sandy Soil Induced by Subway Traffic Vibrations

Sun,

He,

Sun

et al. 2024

Sustainability

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The safety of the geotechnical environment around subways is vitally important for their sustainability. Ground settlement is a very common threat to the safe operation of subways and is related to subway traffic vibrations. Taking Nanjing subway line 10 as an example, field tests, discrete element simulations, and a grey relational analysis are carried out to study the deformation mechanism of the underlying sandy soil induced by vibrations. The results show that the vibration load of Nanjing subway Line 10 is mainly concentrated in the vertical direction. The particles’ coordination number below the subway increases under the vibration load, while the coordination number on the side of the tunnel decreases, which may cause a shear dilatancy effect. Among the five microscopic indexes, the local porosity and the coordination number are closely related to the deformation. Although the deformation of the underlying sandy soil is quite small under the subway traffic load, it will accumulate under frequent loading and then lead to urban engineering geological disasters.

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Thin Layer Method Simulation of Near Source Ground Motions Due to Discretized Dislocations in Layered Soils

Cited by 2 publications

References 11 publications

Time-domain thin layer method for computing transient response due to sudden/moving loads

Time-domain thin layer method for computing transient response due to sudden/moving loads

Deformation Mechanism of Underlying Sandy Soil Induced by Subway Traffic Vibrations

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