中国铁道科学2024，Vol.45Issue(2)：134-145,12.DOI:10.3969/j.issn.1001-4632.2024.02.13
框架梁与锚索桩板墙加固隧道洞口边坡的动力响应特性
Dynamic Response Characteristics of Tunnel Portal Slope Reinforced by Frame Beam and Anchor Cable Pile Sheet Wall
摘要
Abstract
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.关键词
隧道洞口边坡/框架梁/锚索桩板墙/降雨/地震/动力响应/振动台试验Key words
Tunnel portal slope/Frame beam/Anchor cable pile sheet wall/Rainfall/Earthquake/Dynamic response/Shaking table test分类
交通工程引用本文复制引用
冯海洲,蒋关鲁,何梓雷,郭玉丰,何晓龙,刘先峰,胡金山..框架梁与锚索桩板墙加固隧道洞口边坡的动力响应特性[J].中国铁道科学,2024,45(2):134-145,12.基金项目
科技部海外合作重大基金资助项目(2022YFE0104600) （2022YFE0104600）
国家自然科学基金资助项目(52378463) （52378463）
