高烈度地震区高边坡支挡结构振动台试验研究
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摘要
利用振动台试验可以模拟地层受剪切波作用的现场动力条件的特点,针对位于8度高烈度地震区的玉蒙铁路的路堑高边坡工点,通过大型振动试验,对单排桩和双排桩支挡结构在不同地震加速度条件下的桩身受力、土体加速度、桩顶位移情况进行测试,对比分析单排桩和双排桩抗滑支挡结构在高边坡中的支护效果。试验结果显示,单排桩和双排桩的桩后总土压力、动土压力分布相似,均为反S形,且单排桩的总土压力、动力土压力要比双排桩相同位置的总土压力和动土压力大1.5~2.0倍;相同地震加速度下,双排桩结构的土体加速度要比单排桩结构的土体加速度小,双排桩下桩的桩顶位移要比单排桩的桩顶位移小。说明对于高烈度地震区高边坡的加固,双排桩支挡结构的支护效果明显好于单排桩支挡结构。
Based on the worksite of Yuxi to Mengzi railway which is located on the strong seismic region of 8degree intensity, the shaking table test was carried out to simulate the dynamic field situation caused by shear wave. The force acting on the pile,the acceleration in the soil and the deformation at pile top of single pile and double row pile retaining structure under different earthquake accelerations are tested. And the comparisons of support effect for the single pile and the double row pile anti-slide structure are analyzed. It shows that distribution of the total earth pressures and the dynamic earth pressures acting on the back of the piles are the same. And the value of single pile is 1.5 to 2 times greater than that of double row pile structure for the same position. Under the same earthquake acceleration,the peaks of acceleration in the soil of single pile structure is greater than that of double row structure, and the settlement of pile top at the low pile of double pile structure is less than that of single pile structure. The support effect of double row pile retaining structure is better than single pile retaining structure on strong seismic region.
Based on the worksite of Yuxi to Mengzi railway which is located on the strong seismic region of 8degree intensity, the shaking table test was carried out to simulate the dynamic field situation caused by shear wave. The force acting on the pile,the acceleration in the soil and the deformation at pile top of single pile and double row pile retaining structure under different earthquake accelerations are tested. And the comparisons of support effect for the single pile and the double row pile anti-slide structure are analyzed. It shows that distribution of the total earth pressures and the dynamic earth pressures acting on the back of the piles are the same. And the value of single pile is 1.5 to 2 times greater than that of double row pile structure for the same position. Under the same earthquake acceleration,the peaks of acceleration in the soil of single pile structure is greater than that of double row structure, and the settlement of pile top at the low pile of double pile structure is less than that of single pile structure. The support effect of double row pile retaining structure is better than single pile retaining structure on strong seismic region.
引文
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[12]仵锋锋,曹平,万琳辉.相似理论及其在模拟试验中的应用[J].采矿技术,2007,(4):64–75.(WU Fengfeng,CAO Ping,WAN Linhui.The theory of similarity and the application in the simulation test[J].Mining Technology,2007,(4):64–75.(in Chinese))
[13]中华人民共和国行业标准编写组.TB10025—2006铁路路基支挡结构设计规范[S].北京:中国铁道出版社,2006.(The Professional Standards Compilation Group of Peoples Republic of China.TB10025—2006 Code for Design on Retaining Structures of Railway Subgrade[S].Beijing:China Railway Publishing House,2006.(in Chinese))
[2]于玉贞,邓丽军.抗滑桩加固边坡地震响应离心模型试验[J].岩土工程学报,2007,29(9):1 320–1 323.(YU Yuzhen,DENG Lijun.Centrifuge modeling of seismic behavior of slopes reinforced by stabilizing pile[J].Chinese Journal of Geotechnical Engineering,2007,29(9):1 320–1 323.(in Chinese))
[3]于玉贞,李荣建,李广信,等.抗滑桩静力与动力破坏离心模型试验对比分析[J].岩土工程学报,2008,30(7):1 090–1 093.(YU Yuzhen,LI Rongjian,LI Guangxin,et al.Centrifuge modeling of static and dynamic failure of stabilizing piles in slope[J].Chinese Journal of Geotechnical Engineering,2008,30(7):1 090–1 093.(in Chinese))
[4]于玉贞,李荣建,柴霖,等.铜质模型桩加固边坡的动力离心模型试验研究[J].水文地质工程地质,2008,(5):41–46.(YU Yuzhen,LI Rongjian,CHAI Lin,et al.Dynamic centrifuge test of slope reinforced with copper model piles[J].Hydrogeology and Engineering Geological,2008,(5):41–46.(in Chinese))
[5]叶海林,郑颖人,李安洪,等.地震作用下边坡抗滑桩振动台试验研究[J].岩土工程学报,2012,34(2):251–257.(YE Hailin,ZHENG Yingren,LI Anhong,et al.Shaking table tests on stabilizing piles of slopes under earthquakes[J].Chinese Journal of Geotechnical Engineering,2012,34(2):251–257.(in Chinese))
[6]叶海林,郑颖人,黄润秋,等.强度折减动力分析法在滑坡抗滑桩抗震设计中的应用研究[J].岩土力学,2010,31(增1):317–323.(YE Hailin,ZHENG Yingren,HUANG Runqiu,et al.Study of application of strength reduction dynamic analysis method to aseismic design of anti-slide piles for landslide[J].Rock and Soil Mechanics,2010,31(Supp.1):317–323.(in Chinese))
[7]许江波,郑颖人,叶海林,等.埋入式抗滑桩支护地震边坡研究[J].地下空间与工程学报,2011,7(4):781–788.(XU Jiangbo,ZHENG Yingren,YE Hailin,et al.Research of embedded anti-slide pile supporting slope during earthquake[J].Chinese Journal of Underground Space and Engineering,2011,7(4):781–788.(in Chinese))
[8]年庭凯,栾茂田,杨庆.考虑地震效应的阻滑桩加固土坡简化分析方法[J].大连理工大学学报,2007,47(5):718–722.(NIAN Tingkai,LUAN Maotian,YANG Qing.Simplified analytical procedure of stabilizing piles against sliding considering earthquake effect[J].Journal of Dalian University of Technology,2007,47(5):718–722.(in Chinese))
[9]杨波,郑颖人,赵尚义,等.双排抗滑桩在三种典型滑坡的计算与受力规律分析[J].岩土力学,2010,31(增1):237–244.(YANG Bo,ZHENG Yingren,ZHAO Shangyi,et al.Two-row anti-slide piles in three kinds of typical landslide computations and stress rule analysis[J].Rock and Soil Mechanics,2010,31(Supp.1):237–244.(in Chinese))
[10]范秋雁,许胜才,崔峰.一类双排桩支护结构内力计算[J].岩石力学与工程学报,2012,31(增1):3 152–3 158.(FANG Qiuyan,XU Shengcai,CUI Feng.Calculation for a type of retaining structure with double-row piles[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(Supp.1):3 152–3 158.(in Chinese))
[11]申永江,孙红月,尚岳全,等.滑坡推力在悬臂式双排抗滑桩上的分配[J].岩石力学与工程学报,2012,31(增1):2 668–2 673.(SHEN Yongjiang,SUN Hongyue,SHANG Yuequan,et al.Distribution of landslide thrust on cantilever double-row anti-sliding piles[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(Supp.1):2 668–2 673.(in Chinese))
[12]仵锋锋,曹平,万琳辉.相似理论及其在模拟试验中的应用[J].采矿技术,2007,(4):64–75.(WU Fengfeng,CAO Ping,WAN Linhui.The theory of similarity and the application in the simulation test[J].Mining Technology,2007,(4):64–75.(in Chinese))
[13]中华人民共和国行业标准编写组.TB10025—2006铁路路基支挡结构设计规范[S].北京:中国铁道出版社,2006.(The Professional Standards Compilation Group of Peoples Republic of China.TB10025—2006 Code for Design on Retaining Structures of Railway Subgrade[S].Beijing:China Railway Publishing House,2006.(in Chinese))
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