Dynamic Response Law of Loess Slope with Different Shapes

Yan, Zhang; Zhang, Sen; Zhang, Xuedong; Jiang, Ping

doi:10.1155/2019/4853102

Cited by 6 publications

(2 citation statements)

References 10 publications

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“…The slope response owing to ground motion main involved in velocity, acceleration, displacement, dynamic stress, strain, and so on. Numerical simulations [7,24,[31][32][33][34][35] and physical model tests [15,32,[34][35][36][37] have been the primary methods to study the dynamic response of loess slopes. Shaking table tests are helpful for accurately and dynamically reflecting slope response under seismic loading.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response Characteristics of Steep Loess Slope with a Tunnel under the Earthquake Actions

Yue,

Liang,

Fan

et al. 2023

Preprint

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With more and more transportation tunnels have been and will be constructed in loess areas in Northwest China with high earthquake potential, the overall stability of portal section under earthquakes actions and the related aseismic countermeasures attracted the attentions from both the scholars and engineers, especially the tunnels in the upper slope connecting the high bridges crossing rivers or valleys. In order to study the dynamic response characteristics and damage evolution of steep loess slope with a tunnel under the earthquake actions, a large-scale shaking table tests were performed on steep loess slope with a tunnel. Wenchuan-tangyu (WT) wave and El Centro (El) wave records were applied on the model to investigate the displacement response and acceleration response of loess slope with a tunnel under the horizontal (X) and the combined action of horizontal and vertical (X-Z) seismic loads, respectively. In particular, three-dimensional non-contact optical measurement techniques were used to obtain the slope surface displacements. The results showed that the main deformation pattern of the slope was horizontal movement and settlement when the seismic wave input was in the X and X-Z directions, respectively. However, the X direction seismic wave had a greater impact on the deformation of the slope, and the tunnel portal slope was destroyed under the action of a large horizontal seismic acceleration finally. Slope failure ahead of a tunnel could be divided into four stages, i.e. elastic deformation stage, plastic deformation accumulation stage, local failure stage, and overall failure stage. The peak ground displacement of X direction (PGDX) and peak ground displacement of Z direction (PGDZ) of the slope surface increased with the increasing of the input peak ground acceleration (PGA) when the input wave was same waveform and same direction. The existence of the tunnel had a great influence on the PGA and the PGA amplification factor (PGAAF) of the soil mass surrounding it. This was because the seismic waves encounter a tunnel surface with clear differences in the physical properties of the medium during their propagation in the slope, thereby forming a strong reflection and refraction effect, and the amplitude changed significantly. Numerical simulation results were basically consistent with the experimental results.

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Section: Introductionmentioning

confidence: 99%

Dynamic Response Characteristics of Steep Loess Slope with a Tunnel under the Earthquake Actions

Yue,

Liang,

Fan

et al. 2023

Preprint

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“…In recent years, with the continuous improvement of the scale of transportation infrastructure, a large number of high and steep slope projects have appeared in the loess area [1,2]. In order to ensure the safety of the slope, the high and steep slopes are often graded in practical projects to form a stepped multistage slope, and support measures are used for reinforcement.…”

Section: Introductionmentioning

confidence: 99%

Analysis on Deformation Failure and Structural Mechanical Characteristics of Multistage Loess Slope Supported by Frame Structure with Anchors

Yang

Yan-peng

et al. 2022

Advances in Civil Engineering

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Frame anchor supporting structure is widely accepted in the loess area, especially in the multistage slopes along the road. However, the development between theory and practice is not synchronous, and there exist experience and uncertainty in the design process to a great extent. In response to this problem, the multistage loess slope supported by frame structure with anchors is taken as the research object, and the model test is carried out with the help of the large-scale geotechnical centrifuge under the condition of using prototype materials as much as possible. Then, according to the test data and phenomena, the structural stress and slope deformation concerned in the project are analyzed. The main differences in stress and deformation between the multistage loess slope supported by frame structure with anchors and other types of slopes are pointed out, and some targeted suggestions are given. The research results show that the frame anchor supporting structure and soil can always maintain coordinated deformation during centrifugal loading, and the failure process has certain toughness characteristics. The stress characteristics of the anchor rod and the sliding deformation range of the slope in the multistage loess slope supported by frame structure with anchors are different from the slope with structural surface and single-stage slope. The length of the anchoring section cannot be completely determined based on the potential sliding surface in the design. It is reasonable to strictly control the end position of the anchoring section from the perspective of changing the position of the potential sliding surface. The results obtained can enrich and improve the stability theory of multistage loess slope and provide guidance for engineering practice.

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Dynamic response and mechanical deformation properties of the soil cutting slope under train cyclic loads

Xie

et al. 2020

Arab J Geosci

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Dynamic Response Law of Loess Slope with Different Shapes

Cited by 6 publications

References 10 publications

Dynamic Response Characteristics of Steep Loess Slope with a Tunnel under the Earthquake Actions

Dynamic Response Characteristics of Steep Loess Slope with a Tunnel under the Earthquake Actions

Analysis on Deformation Failure and Structural Mechanical Characteristics of Multistage Loess Slope Supported by Frame Structure with Anchors

Dynamic response and mechanical deformation properties of the soil cutting slope under train cyclic loads

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