含小净距隧道岩石边坡地震动力特性的大型振动台试验研究

江学良; 牛家永; 连鹏远; 文畅平; 王飞飞

doi:10.6052/j.issn.1000-4750.2015.11.0936

含小净距隧道岩石边坡地震动力特性的大型振动台试验研究

江学良^1,2,
牛家永^1,2,,
连鹏远^1,2,
文畅平^1,2,
王飞飞^1,2

1.
中南林业科技大学土木工程与力学学院, 湖南, 长沙 410004;
2.
中南林业科技大学岩土工程研究所, 湖南, 长沙 410004

基金项目: 国家自然科学基金项目（51204125，51404309）

详细信息

作者简介:
江学良(1977-),男,湖南人,教授,博士,主要从事地下结构抗震减震与岩土力学等方面的研究(E-mail:15675101471@163.com);连鹏远(1990-),男,河南人,硕士生,从事岩土动力学方面研究(E-mail:anranzhishang@126.com);文畅平(1965-),男,湖南人,教授,博士,从事岩土动力学方面的教学与研究(E-mail:wenchangping@163.com);王飞飞(1991-),男,安徽人,硕士生,从事岩土动力学方面研究(E-mail:ffw1991@126.com).

通讯作者:
牛家永(1992-),男,宁夏人,硕士生,从事岩土动力学方面研究(E-mail:niujiaying666@sina.com).

中图分类号: P315.9;U456
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出版历程
- 收稿日期: 2015-11-24
- 修回日期: 2016-05-15
- 刊出日期: 2017-05-24

LARGE-SCALE SHAKING TABLE TEST STUDY ON SEISMIC RESPONSE CHARACTERISTICS OF ROCK SLOPE WITH SMALL SPACING TUNNEL

1.
School of Civil Engineering and Mechanics, Central South University of Forestry and Technology, Changsha, Hunan 410004, China;
2.
Institute of Geotechnical Engineering, Central South University of Forestry and Technology, Changsha, Hunan 410004, China

More Information

Corresponding author:
NIU Jia-yong: 10.6052/j.issn.1000-4750.2015.11.0936

摘要

摘要: 为研究含小净距隧道岩石边坡在地震作用下的动力特性，设计了一个比尺1∶10的含小净距隧道岩石边坡的大型振动台试验模型，试验以汶川波（WC）作为振动台激振波，采用水平（x）向、竖直（z）向和水平竖直（xz）向三种激振方式，研究地震作用下边坡的加速度响应特性和动位移响应特性。试验结果表明：1）边坡加速度放大系数沿坡面向上呈现出先减小后增大的非线性变化特征，边坡会改变输入地震波的频谱成分，对高频段地震波存在滤波作用。2） x、z单向激振下边坡加速度放大系数随着加载加速度峰值的增大而增大，xz双向激振下则随着加载加速度峰值的增大而减小。3）以3/5坡高为界，此高度以下，边坡对竖向地震波的放大作用大于对水平向地震波的放大作用，在此高度以上则刚好相反。4）边坡水平方向位移主要受水平向地震波的影响，且随着激振加速度峰值的增大而增大。5）以4/5坡高为界，此高度以下动位移峰值增大趋势缓慢，此高度以上，动位移响应峰值急剧增大，且在坡顶处产生最大的水平位移。6）边坡的动位移响应与地震波的激振方向和测点位置有关。试验研究结果对含小净距隧道边坡抗震设计及其地震动力反应特性的研究有一定的指导意义。
- 地震工程 /
- 含小净距隧道岩石边坡 /
- 大型振动台模型试验 /
- 加速度响应 /
- 动位移响应
Abstract: In order to study the dynamic characteristics of rock slope with small spacing tunnel under seismic action, a large-scale shaking table slope model test was designed. The geometric scale was 1:10. In the model test, the Wenchuan (WC) seismic wave was used as the excitation wave to study the characteristics of acceleration response and displacement response of the rock slope model. The excitation directions included the horizontal direction (x), the vertical direction (z) and the horizontal and vertical direction (xz). The results show: 1) Upward along with the slope surface, the acceleration amplification coefficients show nonlinear variation which increases at first and then decreases. Slope changes the input seismic wave spectrum components and has filtered effect at high frequency; 2) In the x- or z-direction excitation, while the acceleration amplification coefficients increase with the increase of the peak loads. In the xz-direction excitation, the coefficients decrease with the increase of the peak loads; 3) 3/5 of slope height is the critical height. The vertical acceleration is amplified more obviously than horizontal acceleration while below the height; but above the height, the horizontal acceleration is amplified more obviously. 4) The horizontal displacement of the slope is mainly affected by the horizontal direction of the seismic wave, and the horizontal displacement increases with the increase of the peak loads. 5) 4/5 of slope height is the critical height, the dynamic displacement peak increases slowly while below the height, but the dynamic displacement peak increases rapidly when above the height and the maximum horizontal displacement is on the top of slope. 6) The dynamic displacement response is related to the excitation direction and location of transducers. These results improve the knowledge of the rock slope with small spacing tunnel under seismic action.
- earthquake engineering /
- rock slope with small spacing tunnel /
- large shaking table model test /
- acceleration response /
- dynamic displacement response

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