滑坡对不同特性地震波的动力响应规律
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摘要
地震边坡是边坡工程和地震工程的重要对象之一,而边坡在地震作用下的动力响应规律则是研究的核心内容。本文以玉树机场路滑坡群0#滑坡第七条块为研究对象,以大型有限元分析软件FLAC3D为研究工具,通过对正弦波、玉树水平波、玉树竖向波不同加速峰值作用下滑坡动力响应规律的研究,得到如下结论:(1)加速度放大系数在滑床内基本呈线性增大,但在滑面处有明显间断。(2)在正弦波、玉树水平波不同加速度峰值条件下滑带对加速度的影响规律一致。当加速度峰值较小时,滑带对加速度的影响较弱,随着加速度峰值的增大,滑带的滤波作用越来越显著。(3)相较于输入水平地震动,竖向地震动在坡体内引起的水平地震峰值加速度放大系数规律不太明显,仍需要进一步研究。
The research of seismic slope is an important part of the research of slope engineering and seismic engineering,and the dynamic response law of the slope under earthquake is the core of the research. This paper takes the seventh lanslide of 0# landslide group at the Yushu Airport Road as the research object,using the finite element analysis software FLAC3 Das a research tool. Based on the sine wave,the dynamic response laws of landslides are carried out through analysis on the Yushu waves under different peak acceleration action. The results are as follows:(1) acceleration amplification coefficient linearly increases in sliding bed,but it has obvious discontinuity at the slip surface.(2) the law of influence on acceleration is consistent in the sine wave and the peak condition of the Yushu horizontal wave. When the peak acceleration is small,the influence of the sliding zone on the acceleration is weak. With the increase of the peak acceleration,the filtering effect of the slip zone is becoming more and more significant.(3) compared with the input horizontalseismic motion,the law of the amplification coefficient of horizontal seismic peak acceleration caused by vertical ground motion in the slope is not obvious.
The research of seismic slope is an important part of the research of slope engineering and seismic engineering,and the dynamic response law of the slope under earthquake is the core of the research. This paper takes the seventh lanslide of 0# landslide group at the Yushu Airport Road as the research object,using the finite element analysis software FLAC3 Das a research tool. Based on the sine wave,the dynamic response laws of landslides are carried out through analysis on the Yushu waves under different peak acceleration action. The results are as follows:(1) acceleration amplification coefficient linearly increases in sliding bed,but it has obvious discontinuity at the slip surface.(2) the law of influence on acceleration is consistent in the sine wave and the peak condition of the Yushu horizontal wave. When the peak acceleration is small,the influence of the sliding zone on the acceleration is weak. With the increase of the peak acceleration,the filtering effect of the slip zone is becoming more and more significant.(3) compared with the input horizontalseismic motion,the law of the amplification coefficient of horizontal seismic peak acceleration caused by vertical ground motion in the slope is not obvious.
引文
[1]李波.地震作用下边坡稳定性分析及其动力响应研究[D].哈尔滨:黑龙江大学,2014.LI Bo. Stability analysis and dynamic response of slope under earthquake[D]. Ha’erbin:Heilongjiang University,2014.
[2]张文,刘勇,王运生,等.地震作用下边坡及不利地质体的动力特征[J].山地学报,2016,34(6):732-740.ZHANG Wen,LIU Yong,WANG Yunsheng,et al.The dynamic characteristics of the slope and unfavorable geological bodies under the earthquake action[J]. Mountain Journal,2016,34(6):732-740.
[3]徐光兴.地震作用下边坡工程动力响应与永久位移分析[D].成都:西南交通大学,2011.XU Guangxing. Analysis of dynamic response and permanent displacement of slope engineering under earthquake[D]. Chengdu:Southwest Jiao Tong University,2011.
[4] CELEBI M. Topographic and geological amplificationdetermined form strong motion and aftershock records of 3 march 1985 chile earthquake[J]. Bulletin of the SELsmological Society of Amercian,1987,77(4):1141-1147.
[5]刘红兵,朱晞.地震中地形放大效应的观测和研究进展[J].世界地震工程,1999,15(3):20-25.LIU Hongbing,ZHU Xi. Observation of topographic magnification in earthquake and research progress[J]. World Earthquake Engineering,1999,15(3):20-25.
[6]张江伟,高晓莉,李小军,等.土质边坡地震动力响应规律研究[J].震灾防御技术,2016,11(4):771-780.ZHANG Jiangwei,GAO Xiaoli,LI Xiaojun,et al.Study on the dynamic response of the soil slope seismic dynamic response[J]. Earthquake Disaster Defense Technology,2016,11(4):771-780.
[7]邹烨,郭明伟,王水林,等.地震荷载下三维边坡动力稳定性分析[J].岩石力学与工程学报,2017,36(5):1174-1184.ZOU Ye, GUO Mingwei, WANG Shuilin, et al.Analysis of 3D slope dynamic stability under seismic load[J]. Chinese Journal of Rock Mechanics and Engineering,2017,36(5):1174-1184.
[8] HUTCHINSON J N. General report:Morphological and geotechnical parameters of landslide in relation to geology and hydrogeology[C]//Bonnard C.Proceedings of the 5th International Symposium on landslides,1998:3-35.
[9]陈臻林,杨小奇.地震波作用下含反倾软弱夹层岩质边坡动力响应规律研究[J].应用数学和力学,2105,36(S):155-165.CHEN Zhenlin, YANG Xiaoqi. Study on dynamic response of rock slope with anti dip soft intercalation under seismic wave[J]. Applied Mathematics and Mechanics,2105,36(S):155-165.
[2]张文,刘勇,王运生,等.地震作用下边坡及不利地质体的动力特征[J].山地学报,2016,34(6):732-740.ZHANG Wen,LIU Yong,WANG Yunsheng,et al.The dynamic characteristics of the slope and unfavorable geological bodies under the earthquake action[J]. Mountain Journal,2016,34(6):732-740.
[3]徐光兴.地震作用下边坡工程动力响应与永久位移分析[D].成都:西南交通大学,2011.XU Guangxing. Analysis of dynamic response and permanent displacement of slope engineering under earthquake[D]. Chengdu:Southwest Jiao Tong University,2011.
[4] CELEBI M. Topographic and geological amplificationdetermined form strong motion and aftershock records of 3 march 1985 chile earthquake[J]. Bulletin of the SELsmological Society of Amercian,1987,77(4):1141-1147.
[5]刘红兵,朱晞.地震中地形放大效应的观测和研究进展[J].世界地震工程,1999,15(3):20-25.LIU Hongbing,ZHU Xi. Observation of topographic magnification in earthquake and research progress[J]. World Earthquake Engineering,1999,15(3):20-25.
[6]张江伟,高晓莉,李小军,等.土质边坡地震动力响应规律研究[J].震灾防御技术,2016,11(4):771-780.ZHANG Jiangwei,GAO Xiaoli,LI Xiaojun,et al.Study on the dynamic response of the soil slope seismic dynamic response[J]. Earthquake Disaster Defense Technology,2016,11(4):771-780.
[7]邹烨,郭明伟,王水林,等.地震荷载下三维边坡动力稳定性分析[J].岩石力学与工程学报,2017,36(5):1174-1184.ZOU Ye, GUO Mingwei, WANG Shuilin, et al.Analysis of 3D slope dynamic stability under seismic load[J]. Chinese Journal of Rock Mechanics and Engineering,2017,36(5):1174-1184.
[8] HUTCHINSON J N. General report:Morphological and geotechnical parameters of landslide in relation to geology and hydrogeology[C]//Bonnard C.Proceedings of the 5th International Symposium on landslides,1998:3-35.
[9]陈臻林,杨小奇.地震波作用下含反倾软弱夹层岩质边坡动力响应规律研究[J].应用数学和力学,2105,36(S):155-165.CHEN Zhenlin, YANG Xiaoqi. Study on dynamic response of rock slope with anti dip soft intercalation under seismic wave[J]. Applied Mathematics and Mechanics,2105,36(S):155-165.