Dynamic Response Characteristics of Tunnel Portal Slope Reinforced by Frame Beam and Anchor Cable Pile Sheet Wall

被引：0
|
作者：
Feng H. [1 ,2 ]
Jiang G. [1 ,2 ]
He Z. [1 ,2 ]
Guo Y. [1 ,2 ]
He X. [1 ,2 ]
Liu X. [1 ,2 ]
Hu J. [3 ]
机构：
[1] School of Civil Engineering, Southwest Jiaotong University, Sichuan, Chengdu
[2] Key Laboratory of High-Speed Railway Engineering, Ministry of Education, Southwest Jiaotong University, Sichuan, Chengdu
[3] China Railway First Survey and Design Institute Group Co., Ltd., Shaanxi, Xi’an
来源：
Zhongguo Tiedao Kexue/China Railway Science | 2024年 / 45卷 / 02期
关键词：
Anchor cable pile sheet wall; Dynamic response; Earthquake; Frame beam; Rainfall; Shaking table test; Tunnel portal slope;
D O I：
10.3969/j.issn.1001-4632.2024.02.13
中图分类号：
学科分类号：
摘要：
In order to solve the problem that the mountain tunnel portal is prone to be deformed and damaged under rainfall, earthquake and other factors, based on a place taking the tunnel portal slope project supported by frame beam and anchor cable pile sheet wall as the prototype, a shaking table model test with a geometric ratio of 1:50 is carried out to analyze the dynamic response characteristics and instability deformation law of the slope under earthquakes after rainfall. The results show that there is no local damage on the slope surface after rainfall, the damage process of the slope under earthquake can be summarized as tensile damage at the slope crest-shear collapse at the slope foot-the instability and sliding of the overall slope, and the slope exhibits the mode of tension-shear failure. The Peak Ground Acceleration (PGA) amplification factors of the slope present a laminar distribution, and the “elevation effect” and “skin effect” are significant, which amplify with the increase of frequency and amplitude of input sine wave. The peak strain distribution of slope soil is consistent with the slope sliding failure surface. The axial force of pile anchor cable is positively relative to the frequency and amplitude of input sine wave, therefore, its axial force increases significantly under strong earthquakes. The peak earth pressures behind the pile are approximately triangular in distribution, and the pile earth pressure is the highest inside the embedded section of the pile body. The bending moment of the pile body exhibits “b” type distribution, and the peak bending moment is the highest inside the embedded section, so attention should be paid to verify its bending strength in the seismic design. The amplitudes of FFT spectrum of earth pressure behind pile and acceleration of pile body are mainly concentrated in the low-frequency band, and the dynamic response of structure is mainly affected by the low-frequency band of seismic waves. © 2024 Chinese Academy of Railway Sciences. All rights reserved.
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页码：134 / 145
页数：11
相关论文
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