Blast response of a lined cavity in a porous saturated soil

Feldgun, V.R.; Kochetkov, A. V.; Karinski, Y.S.; Yankelevsky, David Z.

doi:10.1016/j.ijimpeng.2007.06.010

Cited by 45 publications

(27 citation statements)

References 32 publications

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“…z i j values (26) from the previous time step (the bottom bases of the corresponding STCs) serve as the initial conditions for this problem. These flux values, Z k , allow the calculation of the flux vectors N l (18), W l (19) and H l (20) at the lateral STC faces (l = 1, 2, 3, 4). The vectors N i−1/2, j−1/2 (18) at the bottom base of the STC are known from the previous time step.…”

Section: Godunov's Methods For Modeling the Soil Mediummentioning

confidence: 99%

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Explosion‐induced dynamic soil–structure interaction analysis with the coupled Godunov–variational difference approach

Karinski

Feldgun

Yankelevsky

2008

Numerical Meth Engineering

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SUMMARYThe paper presents a coupled 2D Godunov-variational difference approach for soil-structure interaction due to a nearby explosion. Owing to the high-intensity dynamic loads, complex processes take place, including transient separation of the buried structure from the surrounding soil, large deformations of the buried structure including loss of stability, and so on. The approach takes into account the irreversible bulk compaction of the soil medium and is based on the relationships of the shock and rarefaction waves with finite-difference equations of the shell motion, using a simple iteration method. The model reduces the contact problem to the self-similar symmetric Riemann problem.The proposed approach is demonstrated by the solution of a buried explosion in the proximity of a lined tunnel buried in soil. The peak contact pressure envelope along the lining was studied. It was found that for an explosion in the proximity of a relatively rigid shell, the maximum value of this envelope is located at some distance from the lining's axis of symmetry.

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Section: Godunov's Methods For Modeling the Soil Mediummentioning

confidence: 99%

“…The elastic plate parameters for this 1D model are as follows: Young's modulus E = 40 GPa, Poisson ratio = 0.15 and density L = 1600 kg/m 3 . The soil properties (see [19]) are as follows:…”

Section: Comparison With Experimental Data: Soil-obstacle Interactionmentioning

confidence: 99%

Explosion‐induced dynamic soil–structure interaction analysis with the coupled Godunov–variational difference approach

Karinski

Feldgun

Yankelevsky

2008

Numerical Meth Engineering

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“…Responses for Structures with the New Blast-Resistant Method (1) Establish numerical models and acquire the data needed for the calculation of the wave converter's displacements in the rapid loading stage and rapid unloading stage. Model 1 without wave converters for the finite element analysis is set up, shown in Figure 4.…”

Section: Calculation Process Of Dynamicmentioning

confidence: 99%

“…Usually the arch structures and structures containing holes have better performance of wave dissipation than rectangular structures or structures without holes, so these kinds of structures have attracted many attentions of scholars [1][2][3]. A good blast-resistant performance is also embodied in the plate-foam composite structure [4], boxshaped steel plate-reinforced concrete composite structure [5], carbon fiber reinforced composite structure [6,7], and prestressed structure [8].…”

Section: Introductionmentioning

confidence: 99%

A Blast-Resistant Method Based on Wave Converters with Spring Oscillator for Underground Structures

Liu

Zhao

et al. 2017

Shock and Vibration

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Researches on blast-resistant measures for underground structures such as tunnels and underground shopping malls are of great importance for their significant role in economic and social development. In this paper, a new blast-resistant method based on wave converters with spring oscillator for underground structures was put forward, so as to convert the shock wave with high frequency and high peak pressure to the periodic stress wave with low frequency and low peak pressure. The conception and calculation process of this new method were introduced. The mechanical characteristics and motion evolution law of wave converters were deduced theoretically. Based on the theoretical deduction results and finite difference software FLAC 3D , the dynamic responses of the new blast-resistant structure and the traditional one were both calculated. Results showed that, after the deployment of wave converters, the peak absolute values of the bending moment, shear force, and axial force of the structure decreased generally, which verified the good blast-resistant effect of the new blast-resistant method.

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“…As for theoretical investigation, a tunnel's response to internal blast loads is generally treated as an axisymmetric plane strain problem, where the blast loading is simplified as uniformly distributed loading which keeps constant along the axial direction, and the tunnel is modeled with continuous isotropic thin shell [18][19][20], but this can hardly be the real case since the explosion could not be a centric infinite line charge detonation. Among those theoretical studies, Gao et al [21] studied a 3D problem of point-source explosion's effects on a long straight cylindrical tunnel in soil.…”

Section: Introductionmentioning

confidence: 99%

Vibration of a Cylindrical Tunnel under a Centric Point-Source Explosion

Zhao

Chen

Vafeidis

et al. 2017

Shock and Vibration

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Underground tunnels are vulnerable to terrorists' bombing attacks, which calls for studies on tunnel's response to internal explosive loading. In this paper, the dynamic response of a cylindrical tunnel to an ideal centric point explosion was treated as an axisymmetric 2-dimensional problem, in which the tunnel was modeled with a continuous anisotropic shell, while the ground medium's effect was accounted for with linear elastic Winkler springs and the explosive loading described by a temporal and spatial function. The governing equation of the motion is a fourth-order partial differential equation, for which a numerical method combining finite difference with the implicit Newmark-method was adopted. This method avoided complicated integral transform and numerical inverse transformation, thus allowing efficient parameter study. The maximum radial displacement was found on the cricle of the center of explosive, where hoop stress is the maximum principal stress. The anisotropy showed little influence on maximum hoop stress. Within the range of ground medium's modulus, minor influence on maximum hoop stress was incurred. This research may be helpful to hazard assessment and protective design for some critical subway tunnels.

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Blast response of a lined cavity in a porous saturated soil

Cited by 45 publications

References 32 publications

Explosion‐induced dynamic soil–structure interaction analysis with the coupled Godunov–variational difference approach

Explosion‐induced dynamic soil–structure interaction analysis with the coupled Godunov–variational difference approach

A Blast-Resistant Method Based on Wave Converters with Spring Oscillator for Underground Structures

Vibration of a Cylindrical Tunnel under a Centric Point-Source Explosion

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