Numerical investigation of secondary-fault rupture propagation through sandy deposits

Chatzidakis, Dionysios; Tsompanakis, Yiannis; Psarropoulos, Prodromos N.

doi:10.1016/j.enggeo.2021.106258

Cited by 9 publications

(3 citation statements)

References 49 publications

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“…3. To emphasize the existence of the fault, bedrocks are established in the model, although the influence of bedrocks on the results is negligible proven by previous studies [35][36][37] in which the bedrock is considered rigid. Because of the distinguished difference in the stiffness between the soil and bedrock, the bedrock hardly deforms during faulting.…”

Section: Fig 2 Geometry Of Embankment Sectionmentioning

confidence: 99%

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Numerical investigation on the behaviors of railway embankment under normal faulting

Chen,

Liu,

et al. 2023

Preprint

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Active faults in the earthquake region are consistently regarded as a potential geological hazard to the construction and operation of railway engineering. However, crossing active faults is always difficult to be avoided for railway construction. In this paper, three-dimensional finite element models are established to study the behaviors of the railway embankment under normal faulting. The constitutive model used in the soil layer is validated by using the data of the centrifuge tests from the existing paper. A series of parametric studies are conducted considering the faulting offset, the thickness of the soil layer, the dip angle of the fault and the cross-fault angle of the embankment. Emphasis is given to (1) the affected zones; (2) the vertical displacement, the longitudinal slope, the lateral displacement, and the radius of the curvature of the embankment centerline; (3) the potential regions where the fault ruptures outcrop based on the plastic strain; (4) the stress characteristic of the embankment surfaces. The analysis shows that the increase of faulting offset would increase the value of longitudinal slope in the cross-fault region of the embankment. The existence of soil layer and its thickening would widen the affected zones and the regions where the fault ruptures outcrops. The fault dip angle and the cross fault angle of the embankment have a complex effect on the behaviors of the crossing embankment. The depth of the subsidence zone of the embankment would increase with the decrease of fault dip angle and the large fault dip angle would change the primary fault rupture to be a compressive one directly above the fault line. If the embankment crosses the fault line obliquely, the curvature radius of the centerline would hardly meet the design code.

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Section: Fig 2 Geometry Of Embankment Sectionmentioning

confidence: 99%

“…10. This kind of element is appropriate for simulating problems with severe mesh distortion and can effectively simulate the large deformation of the embankment under the faulting effect [36,45,47,48]. Fig.…”

Section: Mesh and Element Typementioning

confidence: 99%

Numerical investigation on the behaviors of railway embankment under normal faulting

Chen,

Liu,

et al. 2023

Preprint

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“…In addition, some scholars have performed experiments and simulations to study the influence of the active fault dislocation-displacement mode on tunnel deformation and internal force distribution. The results indicate that under fault dislocation, the affected range of the lining is mainly concentrated near the fault fracture zone [18,19], and the peak stress in the tunnel appears at the junction of the fault fracture zone, hanging wall, and footwall [20,21]. In addition, some scholars have studied the stress-field distribution pattern of the surrounding rock in tunnels crossing active faults [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Influence of advanced engineering measures on displacement and stress field of surrounding rock in tunnels crossing active strike-slip faults

Zhou,

Xiao,

et al. 2023

Front. Struct. Civ. Eng.

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Based on significant improvements in engineering materials, three advanced engineering measures have been proposed—super anchor cables, high-strength concrete anti-fault caverns, and grouting modification using high-strength concrete-to resist fault dislocation in the surrounding rock near tunnels crossing active strike-slip faults. Moreover, single- or multiple-joint advanced engineering measures form the local rock mass-anti-fault (LRAF) method. A numerical method was used to investigate the influence of LRAF methods on the stress and displacement fields of the surrounding rock, and the anti-fault effect was evaluated. Finally, the mechanism of action of the anchor cable was verified using a three-dimensional numerical model. The numerical results indicated that the anchor cable and grouting modification reduced the displacement gradient of the local surrounding rock near the tunnels crossing fault. Furthermore, anchor cable and grouting modifications changed the stress field of the rock mass in the modified area. The tensile stress field of the rock mass in the modified anchor cable area was converted into a compressive stress field. The stress field in the modified grouting area changed from shear stress in the fault slip direction to tensile stress in the axial tunnel direction. The anti-fault cavern resisted the dislocation displacement and reduced the maximum dislocation magnitude, displacement gradient, and shear stress. Among the three advanced engineering measures, the anchor cable was the core of the three advanced engineering measures. An anchor cable, combined with other LRAF measures, can form an artificial safety island at the cross-fault position of the rock mass to protect the tunnel. The research results provide a new supporting idea for the surrounding rock of tunnels crossing active strike-slip faults.

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Three-dimensional modeling of fault geological structure using generalized triangular prism element reconstruction

Liu

et al. 2023

Bull Eng Geol Environ

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Numerical investigation of secondary-fault rupture propagation through sandy deposits

Cited by 9 publications

References 49 publications

Numerical investigation on the behaviors of railway embankment under normal faulting

Numerical investigation on the behaviors of railway embankment under normal faulting

Influence of advanced engineering measures on displacement and stress field of surrounding rock in tunnels crossing active strike-slip faults

Three-dimensional modeling of fault geological structure using generalized triangular prism element reconstruction

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