四川攀枝花机场12#滑坡动力响应数值模拟分析
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摘要
本文以攀枝花机场12#滑坡Ⅱ-Ⅱ’断面治理工程为研究对象,以有限差分软件FLAC3D为研究工具,通过对坡体以及支挡结构的动力响应分析,得到如下结论:(1)坡体各测点峰值加速度出现时间稍微落后于输入地震波的峰值时间,表明由于边坡材料的阻尼作用,边坡动力响应存在滞后现象;(2)加速度放大系数总体随高程增加而增加,具有明显的高程放大效应。且突变点的存在表明支挡结构对于边坡的加速度放大效应具有一定的抑制作用;(3)外凸边坡处加速度响应较其他位置更为强烈,体现了明显的临空面放大效应;(4)地震对于抗滑桩桩身弯矩以及锚索预应力的影响不大,表明锚索抗滑桩加固边坡具有一定的抗震作用。
Taking Panzhihua Airport 12 # landslide II-II section treatment project as the research object,the dynamic response to the slope body and supporting structure was analyzed based on the finite difference software FLAC3 D. The conclusions are as follows:(1) The peak acceleration time at each measuring point lags slightly behind the peak time of input seismic wave. It shows that the slope dynamic response is delayed due to the damping effect of the slope material.(2) The acceleration magnification coefficient increases with the elevation,and has obvious elevation amplification effect. The existence of the abrupt point shows that the retaining structure has a certain inhibitory effect on the acceleration amplification effect of the slope.(3) The acceleration response at the extruding position of the slope is more intense than that of other positions,which reflects the obvious effect on the enlargement of the surface.(4) The earthquake has little influence on thebending moment of the anti slide pile and the prestress of the anchorage cable,which shows that the anchorage pile to reinforce the slope has a certain earthquake-proofing capacity.
Taking Panzhihua Airport 12 # landslide II-II section treatment project as the research object,the dynamic response to the slope body and supporting structure was analyzed based on the finite difference software FLAC3 D. The conclusions are as follows:(1) The peak acceleration time at each measuring point lags slightly behind the peak time of input seismic wave. It shows that the slope dynamic response is delayed due to the damping effect of the slope material.(2) The acceleration magnification coefficient increases with the elevation,and has obvious elevation amplification effect. The existence of the abrupt point shows that the retaining structure has a certain inhibitory effect on the acceleration amplification effect of the slope.(3) The acceleration response at the extruding position of the slope is more intense than that of other positions,which reflects the obvious effect on the enlargement of the surface.(4) The earthquake has little influence on thebending moment of the anti slide pile and the prestress of the anchorage cable,which shows that the anchorage pile to reinforce the slope has a certain earthquake-proofing capacity.
引文
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[10]曹集士.攀枝花机场滑坡滑带土试验及滑坡滑动机理研究[D].西南交通大学,2013.CAO Jishi.Study on soil test and sliding mechanism of landslide in Panzhihua Airport[D].Southwest Jiaotong University,2013.
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[12]潘迪.攀枝花机场三叠系泥岩工程特性理及软化机理研究[D].成都:成都理工大学,2017.PAN Di.Research on the characteristics and softening mechanism of Triassic mudstone in Panzhihua Airport[D].Chengdu:Chengdu University of Technology,2017.
[2]言志信,曹小红,张刘平,等.地震作用下黄土边坡动力响应数值分析[J].岩土力学,2011,32(S2):610-614.YAN Zhixin,CAO Xiaohong,ZHANG Liuping,et al.Numerical analysis of loess slope dynamic response under earthquake[J].Rock and Soil Mechanics,2011,32(S2):610-614.
[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].西南交通大学,2011.XU Guangxing.Analysis of dynamic response and permanent displacement of slope engineering under earthquake[D].Southwest Jiao Tong University,2011.
[4]李鹏,何江达,谢红强,等.地震作用下岩质边坡动力响应分析[J].水力发电,2014,40(2):41-44+64.LI Peng,HE Jiangda,XIE Hongqiang,et al.Analysis of hydro dynamic response of rock slope under earthquake[J].Water Power,2014,40(2):41-44+64.
[5]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.
[6]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.
[7]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):771ZHANG Jiangwei,GAO Xiaoli,LI Xiaojun,et al.Study on the dynamic response of the soil slopeseismic dynamic response[J].Earthquake Disaster Defense Technology,2016,11(4):771-780.
[8]李天斌,刘吉,任洋,等.预加固高填方边坡的滑动机制:攀枝花机场12#滑坡[J].工程地质学报,2012,20(5):723-731.LI Tianbin,LIU Ji,REN Yang,et al.The sliding mechanism of prereinforcing high fill slope:the landslide of Panzhihua Airport 12#[J].Engineering Geology Journal,2012,20(5):723-731.
[9]唐军.高填方边坡在强降雨条件下稳定性分析[D].成都理工大学,2014.TANG Jun.Stability analysis of high fill slope under heavy rainfall[D].Chengdu University of Technology,2014.
[10]曹集士.攀枝花机场滑坡滑带土试验及滑坡滑动机理研究[D].西南交通大学,2013.CAO Jishi.Study on soil test and sliding mechanism of landslide in Panzhihua Airport[D].Southwest Jiaotong University,2013.
[11]孙紫轩.高填方机场边坡稳定性影响因素分析[D].成都:成都理工大学,2015.SUN Zixuan.Analysis on the influence factors of the slope stability of the high-filling airport[D].Chengdu:Chengdu University of Technology,2015.
[12]潘迪.攀枝花机场三叠系泥岩工程特性理及软化机理研究[D].成都:成都理工大学,2017.PAN Di.Research on the characteristics and softening mechanism of Triassic mudstone in Panzhihua Airport[D].Chengdu:Chengdu University of Technology,2017.