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Dynamic Response of Anchoring Layered Rock Slopes Subjected to Seismic Loads


Affiliations
1 College of Civil Engineering, Hunan City University, Yiyang 413000, China; School of Civil Engineering and Architecture, Hubei University of Arts and Science, Xiangyang 441053, China., China
2 College of Resource Environment and Tourism, Hubei University of Arts and Science, Xiangyang 440153, China; Wufeng Tujia Autonomous County Forestry Bureau, Yichang 443099, China., China
3 College of Resource Environment and Tourism, Hubei University of Arts and Science, Xiangyang 440153, China; CAS Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices, Hubei University of Arts and Science, Xiangyang 440153, China., China
 

The seismic dynamic responses of rock slopes are a hot topic for geotechnical engineering studies. Based on the interaction between rock slope and anchor bolts, a dynamic numerical model of a layered rock slope was developed using the finite difference software FLAC3D. The dynamic response patterns of anchored and natural slopes under seismic loads were analysed to obtain the supporting effect of anchor bolts during seismic activity. The results indicate that under seismic loads, tensile cracks at the intersection of the top and joint surface develop into a drawing open surface of the back edge, and a shear slip occurs at the base of the slope, both of which result in the formation of tensile-shear slip failure. Permanent slope displacement accumulates only when seismic acceleration exceeds the critical acceleration. The slope deformation has been constrained, and the performance of the slope during the seismic activity has been strengthened by anchor bolt supports, which significantly increase the ductility of the rock slope under seismic loads. Moreover, during an earthquake, the axial forces of anchor bolts in the middle slope rise more than at any other position. After the earthquake, anchor bolts in the middle have been shown to exhibit maximum axial force. As a complex problem, stability analysis of seismic slopes is important. The analysis of seismic slope failure and the mechanism of slope anchoring are particularly complicated. The present study will help to improve future research on the seismic design and dynamic analysis of slopes supported by anchor bolts.

Keywords

Anchor Bolts, Anti-seismic Effect, Dynamic Res-Ponse, Layered Rock Slope, Seismic Loads.
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  • Dynamic Response of Anchoring Layered Rock Slopes Subjected to Seismic Loads

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Authors

Wei Zhou
College of Civil Engineering, Hunan City University, Yiyang 413000, China; School of Civil Engineering and Architecture, Hubei University of Arts and Science, Xiangyang 441053, China., China
Zhengman Ding
College of Resource Environment and Tourism, Hubei University of Arts and Science, Xiangyang 440153, China; Wufeng Tujia Autonomous County Forestry Bureau, Yichang 443099, China., China
Tingting Ma
College of Resource Environment and Tourism, Hubei University of Arts and Science, Xiangyang 440153, China; CAS Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices, Hubei University of Arts and Science, Xiangyang 440153, China., China

Abstract


The seismic dynamic responses of rock slopes are a hot topic for geotechnical engineering studies. Based on the interaction between rock slope and anchor bolts, a dynamic numerical model of a layered rock slope was developed using the finite difference software FLAC3D. The dynamic response patterns of anchored and natural slopes under seismic loads were analysed to obtain the supporting effect of anchor bolts during seismic activity. The results indicate that under seismic loads, tensile cracks at the intersection of the top and joint surface develop into a drawing open surface of the back edge, and a shear slip occurs at the base of the slope, both of which result in the formation of tensile-shear slip failure. Permanent slope displacement accumulates only when seismic acceleration exceeds the critical acceleration. The slope deformation has been constrained, and the performance of the slope during the seismic activity has been strengthened by anchor bolt supports, which significantly increase the ductility of the rock slope under seismic loads. Moreover, during an earthquake, the axial forces of anchor bolts in the middle slope rise more than at any other position. After the earthquake, anchor bolts in the middle have been shown to exhibit maximum axial force. As a complex problem, stability analysis of seismic slopes is important. The analysis of seismic slope failure and the mechanism of slope anchoring are particularly complicated. The present study will help to improve future research on the seismic design and dynamic analysis of slopes supported by anchor bolts.

Keywords


Anchor Bolts, Anti-seismic Effect, Dynamic Res-Ponse, Layered Rock Slope, Seismic Loads.

References





DOI: https://doi.org/10.18520/cs%2Fv124%2Fi9%2F1088-1094