Shaking Table Test on Dynamic Response of Bedding Rock Slopes With Weak Structural Plane Under Earthquake

Yang, Changwei; Zhang, Liang; Liu, Yang; Tian, Denghang; Guo, Xueyan

doi:10.3389/fphy.2020.556714

Cited by 10 publications

(3 citation statements)

References 29 publications

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“…Te most direct research approach to studying the seismic behavior of structures is the shaking table test. In recent years, this method has been used wildly in embankment engineering [8][9][10][11]. However, there still have some shortcomings to this method, such as the huge cost and time-consuming, reduced scale model testing.…”

Section: Introductionmentioning

confidence: 99%

Seismic Behavior of Qinghai-Tibetan Railway Embankment in Permafrost Regions: A Case Study

Chen

Wang

2023

Shock and Vibration

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The temperature is a critical factor that determines the unfrozen water content and ice content in the frozen soil. In view of mechanical properties of the frozen soil depend on the volume of components of the four-phase systems, thus the temperature has a significant impact on the mechanical behaviors and deformation properties. The thermal state of the embankment in permafrost regions has a significant seasonal difference, then the seismic performance of the embankment alters with the season. In addition, the seismic performance is highly influenced by the properties of the earthquake motion, especially the seismic intensity. Combining these factors, a numerical simulation was conducted in this study. In this study, taking a typical section of Qinghai-Tibet Railway as an example, a numerical case study on the seismic behavior of embankment was carried out using the dynamic explicit FEM code ABAQUS/Explicit. The El Centro excitation with different intensities was performed in numerical analysis and two distinct thermal states of the embankment in extreme cold and warm days were considered as well. The seismic behaviors of the embankment, including the acceleration responses, the strain response, and the displacement response, were studied effectively. This paper proposes approaches and methods to study the seismic failure mechanism of the infrastructures, and the results can serve as a scientific basis for resisting earthquakes and preventing disasters in cold regions.

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Section: Introductionmentioning

confidence: 99%

Seismic Behavior of Qinghai-Tibetan Railway Embankment in Permafrost Regions: A Case Study

Chen

Wang

2023

Shock and Vibration

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“…Te weak structural surfaces signifcantly afect the stabilization of rock slopes [11]. Fractures and cracks expand during rainfall and earthquakes, and directly trigger the occurrence of landslides [12]. Te tunnel structure and surrounding rock are vulnerable to damage in fracture zones under strong ground motion [13].…”

Section: Introductionmentioning

confidence: 99%

Long-Term Effect Analysis of a High Slope with Tunnel Structure Based on Three-Dimensional Mesh Reconstruction

Shi

Yuan

Che

et al. 2023

Advances in Civil Engineering

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The instability of high rock slopes with tunnel structures increases under the effects of earthquakes and rainfall. Limited studies have been conducted on the long-term effect analysis of high rock slopes with tunnels. Field electrical measurements on rock slopes have been conducted to study the response of high rock slopes with large cross-section tunnels during rainfall and seismic loading. The material threshold was determined using the resistivity probability density statistical method, and a three-dimensional geological visualization model was obtained. A three-dimensional mesh reconstruction method consisting of material segmentation, cluster filtering, mesh generation, and material attribute mapping modules was proposed. The three-dimensional model of high-cutting rock slope was reconstructed, and the three-dimensional finite element model of the rock slope with tunnel was obtained. The response analysis of the slope was performed during rainfall and seismic loading by employing the El-Centro wave. The results demonstrated that plastic strain was generated in the fracture zone of the upper part of the tunnel during rainfall, and the strain value was 8.135 × 10−4. In the subsequent stages, it had a tendency to expand into the tunnel under continuous rainfall. The maximum principal strain was 3.324 × 10−2 under the effect of a strong earthquake. A large strain was generated in the fracture zone at the upper part of the tunnel. It had a tendency to expand under long-term load, which significantly affected the safety of the tunnel.

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“…With the shaking table test, the motion state and the failure process of the test model under the action of an earthquake are recorded through the arrangement of sensors. Since it refects the dynamic response characteristics of the rocks under actual earthquake load in an accurate manner, it is widely used in the research study of the dynamic response patterns of rock masses [4][5][6][7][8][9][10]. Currently, the vibration test for the structure of rocks is limited to simplifying the rocky slope, so it is unable to measure the limit of tectonic stress.…”

Section: Introductionmentioning

confidence: 99%

Study on Seismic Dynamic Response of Deep-Buried Tunnel Based on Tectonic Stress

Guo

2022

Advances in Materials Science and Engineering

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The southeast region of Tibet in China is prone to earthquakes at high seismic levels. Since the construction of tunnels in this region faces a seismic hazard, it is necessary to explore the seismic responses of related construction areas there. In this study, a high-precision finite model of a mountain in a construction area was established based on a deep-buried tunnel in Southeast Tibet. Core specimens were obtained through on-site drilling, with the initial tectonic stress in the tunnel area measured by using the hydraulic fracturing method. Dynamic mechanical parameters of the rocks were acquired through in-situ testing. Moreover, indoor tests were conducted to obtain the physical and mechanical properties of the rocks. The tectonic stress, identified through multiple linear regression inversions, was used as the initial condition for dynamic calculation. The dynamic responses of the tunnel-engineering area under seismic action were calculated, followed by an analysis of the dynamic response characteristics. In addition to dramatic fluctuations in mountain topography, complex dynamic response characteristics of the mountain structure in earthquake environments were also revealed. Although the displacement time-history curve of each observation point displayed a consistent fluctuating pattern, the dynamic displacement extremes in different areas of the mountain varied significantly when the time arrived for their appearance. A maximum dynamic displacement of 0.53 m was observed at the observation point with the highest elevation (5,265.8 m). The acceleration amplification effect inside the mountain body was obvious, with the acceleration increasing as the elevation rose. The time for the occurrence of PGA (acceleration extreme) of each observation point in different directions differed substantially. The extreme value of dynamic stress along the tunnel axis conformed to the distribution pattern of the initial tectonic stress. Compared to the initial tectonic stress, the dynamic stress increased significantly at all observation points along the tunnel axis, with the dynamic stress increasing at a larger rate in the areas at a greater buried depth. Horizontal dynamic stress Sx at the maximum buried depth and Sy increased to 13.86 MPa and 10.32 MPa, respectively, and vertical dynamic stress Sz increased to 4.30 MPa. Variations in horizontal stress became more apparent as the elevation rose, in contrast to weakened variations in vertical stress as the elevation dropped. This study aims to explore the dynamic responses of mountains and the variation law of tectonic stress in deep-buried tunnels in earthquake environments in Tibet through qualitative analysis. The results revealed drastic changes in acceleration, dynamic displacement, and ground stress in the tunnel-engineering area. It is hoped that the contents of the study will contribute to the prevention and control of seismic geological hazards in the tunnel-engineering region and render technical support for the design and construction of similar projects in this region.

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Shaking Table Test on Dynamic Response of Bedding Rock Slopes With Weak Structural Plane Under Earthquake

Cited by 10 publications

References 29 publications

Seismic Behavior of Qinghai-Tibetan Railway Embankment in Permafrost Regions: A Case Study

Seismic Behavior of Qinghai-Tibetan Railway Embankment in Permafrost Regions: A Case Study

Long-Term Effect Analysis of a High Slope with Tunnel Structure Based on Three-Dimensional Mesh Reconstruction

Study on Seismic Dynamic Response of Deep-Buried Tunnel Based on Tectonic Stress

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