基于FLAC3D路桥不稳定边坡治理工程的动力响应研究
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摘要
抗滑桩广泛应用于边坡支护工程,但路桥不稳定边坡抗滑桩对其进行加固时,其在地震作用下的动力响应问题仍未定论。以道真至瓮安高速公路河槽大桥不稳定边坡治理工程为依托,以SIMQKE_GR软件拟合地震设计反应谱,利用FLAC3D有限差分软件建立数值模型,对比地震作用下抗滑桩等支挡结构设立与否对路桥不稳定边坡的动力响应变化规律的影响。结果表明:(1)加速度放大系数无论是沿坡内还是抗滑桩,其值沿竖向均存在一定的震荡变化,但在抗滑桩支护情况下,其震荡幅度明显变小,加速度放大系数变化更平稳。(2)速度放大系数随着高度的增加逐渐减小,未加抗滑桩时速度放大系数在顶层附近出现大幅度波动,添加了抗滑桩的情况下其震荡幅度明显趋缓,变化更稳定。(3)坡体在施加抗滑桩后,治理效果明显,残余位移最大值由无抗滑桩的16.9 cm变为有抗滑桩的1 cm,但最大值均位于边坡表层碎石土和粉质黏土附近。
Anti-slide piles are widely used in slope support engineering. However, when anti-slide piles are used to reinforce unstable slope of highway bridges, the dynamic response of it under earthquake action is still uncertain. Based on the unstable slope treatment project of channel bridge of Daozhen-Weng'an expressway, the seismic design response spectrum is fitted by SIMQKE_GR software, and the numerical model is established by FLAC3 D finite difference software. The influence of anti-slide piles and other retaining structures on the dynamic response of unstable slope under earthquake is studied. The results show that:(1) The magnification coefficient of acceleration varies along the slope and anti-slide pile, but the magnitude of vibration decreases obviously and the magnification coefficient of acceleration varies more smoothly under the condition of anti-slide pile support;(2) The velocity amplification coefficient decreases gradually with the increase of height. Without anti-slide piles, the velocity amplification coefficient fluctuates greatly near the top floor. When anti-slide piles are used, the vibration amplitude slows down and the change is more stable.(3) After the application of anti-slide piles, the treatment effect is obvious. The maximum residual displacement of the slope changes from 16.9 cm without anti-slide piles to 1 cm with anti-slide piles, but the maximum value is located near the gravel soil and silty clay on the surface of the slope.
Anti-slide piles are widely used in slope support engineering. However, when anti-slide piles are used to reinforce unstable slope of highway bridges, the dynamic response of it under earthquake action is still uncertain. Based on the unstable slope treatment project of channel bridge of Daozhen-Weng'an expressway, the seismic design response spectrum is fitted by SIMQKE_GR software, and the numerical model is established by FLAC3 D finite difference software. The influence of anti-slide piles and other retaining structures on the dynamic response of unstable slope under earthquake is studied. The results show that:(1) The magnification coefficient of acceleration varies along the slope and anti-slide pile, but the magnitude of vibration decreases obviously and the magnification coefficient of acceleration varies more smoothly under the condition of anti-slide pile support;(2) The velocity amplification coefficient decreases gradually with the increase of height. Without anti-slide piles, the velocity amplification coefficient fluctuates greatly near the top floor. When anti-slide piles are used, the vibration amplitude slows down and the change is more stable.(3) After the application of anti-slide piles, the treatment effect is obvious. The maximum residual displacement of the slope changes from 16.9 cm without anti-slide piles to 1 cm with anti-slide piles, but the maximum value is located near the gravel soil and silty clay on the surface of the slope.
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 action [D].Harbin:Heilongjiang University,2014.(in Chinese)
[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.Dynamic characteristics of slope and unfavorable geological body under earthquake action [J].Journal of Mountain Area,2016,34 (6):732-740.(in Chinese)
[3] 祈生文,伍法权,严福章,等.岩质边坡动力反应[M].北京:科学出版社,2007.QI Shengwen,WU Faquan,YAN Fuzhang,et al.The Dynamic Slope of Rock Slope [M].Beijing:Science Press,2007.
[4] 叶海林,郑颖人,黄润秋,等.锚杆支护岩质边坡地震动力响应分析[J].后勤工程学院学报,2010,26(4):1-7.YE Hailin,ZHENG Yingren,HUANG Runqiu,et al.Seismic response analysis of rock slope supported by rock bolts [J].Journal of Logistics Engineering College,2010,26 (4):1-7.(in Chinese)
[5] 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.Dynamic response and permanent displacement analysis of slope engineering under earthquake action [D].chengdu:Southwest Jiao Tong University,2011.(in Chinese)
[6] 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.Dynamic stability analysis of three-dimensional slope under seismic loading [J].Chinese Journal of Rock Mechanics and Engineering,2017,36 (5):1174-1184.(in Chinese)
[7] 陈臻林,杨小奇.地震波作用下含反倾软弱夹层岩质斜坡动力响应规律研究[J].应用数学和力学,2105,36(增刊),155-165.CHEN Zhenlin,YANG Xiaoqi.Study on dynamic response of rock slope with anti dip soft intercalation under seismic wave [J].Application Mathematics and Mechanics,2105,36 (Suppl),155-165.(in Chinese)
[8] 廖海龙.黔中典型堆积体边坡稳定性分析与抗滑桩加固措施敏感性研究[D].成都:西南交通大学,2012.LIAO Hailong.Stability analysis of typical accumulation slope in Central Guizhou and sensitivity of anti slide pile reinforcement measures [D].Chengdu:Southwest Jiao Tong University,2012.(in Chinese)
[9] 孙鹏.欠稳定边坡上抗滑桩桩前土体稳定与抗力发挥程度的研究[D].成都:西南交通大学,2016.SUN Peng.Study on soil stability and resistance exertion before anti slide pile on less stable slope [D].Chengdu:Southwest Jiao Tong University,2016.(in Chinese)
[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.Dynamic characteristics of slope and unfavorable geological body under earthquake action [J].Journal of Mountain Area,2016,34 (6):732-740.(in Chinese)
[3] 祈生文,伍法权,严福章,等.岩质边坡动力反应[M].北京:科学出版社,2007.QI Shengwen,WU Faquan,YAN Fuzhang,et al.The Dynamic Slope of Rock Slope [M].Beijing:Science Press,2007.
[4] 叶海林,郑颖人,黄润秋,等.锚杆支护岩质边坡地震动力响应分析[J].后勤工程学院学报,2010,26(4):1-7.YE Hailin,ZHENG Yingren,HUANG Runqiu,et al.Seismic response analysis of rock slope supported by rock bolts [J].Journal of Logistics Engineering College,2010,26 (4):1-7.(in Chinese)
[5] 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.Dynamic response and permanent displacement analysis of slope engineering under earthquake action [D].chengdu:Southwest Jiao Tong University,2011.(in Chinese)
[6] 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.Dynamic stability analysis of three-dimensional slope under seismic loading [J].Chinese Journal of Rock Mechanics and Engineering,2017,36 (5):1174-1184.(in Chinese)
[7] 陈臻林,杨小奇.地震波作用下含反倾软弱夹层岩质斜坡动力响应规律研究[J].应用数学和力学,2105,36(增刊),155-165.CHEN Zhenlin,YANG Xiaoqi.Study on dynamic response of rock slope with anti dip soft intercalation under seismic wave [J].Application Mathematics and Mechanics,2105,36 (Suppl),155-165.(in Chinese)
[8] 廖海龙.黔中典型堆积体边坡稳定性分析与抗滑桩加固措施敏感性研究[D].成都:西南交通大学,2012.LIAO Hailong.Stability analysis of typical accumulation slope in Central Guizhou and sensitivity of anti slide pile reinforcement measures [D].Chengdu:Southwest Jiao Tong University,2012.(in Chinese)
[9] 孙鹏.欠稳定边坡上抗滑桩桩前土体稳定与抗力发挥程度的研究[D].成都:西南交通大学,2016.SUN Peng.Study on soil stability and resistance exertion before anti slide pile on less stable slope [D].Chengdu:Southwest Jiao Tong University,2016.(in Chinese)