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
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摘要
利用动力有限差分软件FLAC,结合强度折减动力分析法,提出抗滑桩抗震设计新方法,将滑坡安全稳定系数作为岩土体参数折减系数对岩土体参数进行折减,采用FLAC动力分析,考虑了桩与岩土体地震荷载下动力相互作用,将地震作用过程中桩内力峰值除以混凝土强度增大系数与地震作用完毕之后桩的内力值进行比较,二者中大值作为桩的抗震设计内力值,同时还要求桩顶边坡动力安全系数大于设计容许值,确保滑坡不会发生越顶破坏。通过一个滑坡算例,对抗滑桩支护抗震设计进行分析,结果表明:动力强度折减分析法进行抗滑桩抗震设计,能考虑桩土动力相互作用,并得到实际桩前推力分布形式,为抗滑桩支护边坡的抗震设计提供了一个新的思路。
Using dynamic finite difference software-FLAC, combining with strength reduction dynamic analysis method, a new method for anti-sliding pile aseismic design is proposed. Taking the security and stability factor of the landslide as a discount factor of rock mass parameters, then the rock mass parameters is discounted. Using FLAC dynamic analysis, soil-pile dynamic interaction is considered; the peak internal forces of piles engendered during the earthquake is divided by the coefficient of concrete strength increasing under earthquake, which compared with the internal forces of piles after the earthquake, the larger is considered to be the value of internal forces for aseismic design. While after the piles have been supported, the dynamic safety factor of the landslide should greater than the acceptable value to ensure the landslide would not damage over topping. An example of landslide with pile supported is given. The results show that the strength reduction dynamic analysis method is able to consider soil-pile dynamic interaction, and get the real distributed form of thrust force, so as to provide a new idea for aseismic design of anti-slide piles.
Using dynamic finite difference software-FLAC, combining with strength reduction dynamic analysis method, a new method for anti-sliding pile aseismic design is proposed. Taking the security and stability factor of the landslide as a discount factor of rock mass parameters, then the rock mass parameters is discounted. Using FLAC dynamic analysis, soil-pile dynamic interaction is considered; the peak internal forces of piles engendered during the earthquake is divided by the coefficient of concrete strength increasing under earthquake, which compared with the internal forces of piles after the earthquake, the larger is considered to be the value of internal forces for aseismic design. While after the piles have been supported, the dynamic safety factor of the landslide should greater than the acceptable value to ensure the landslide would not damage over topping. An example of landslide with pile supported is given. The results show that the strength reduction dynamic analysis method is able to consider soil-pile dynamic interaction, and get the real distributed form of thrust force, so as to provide a new idea for aseismic design of anti-slide piles.
引文
[1]黄润秋,李为乐.“5.12”汶川大地震触发地质灾害的发育分布规律研究[J].岩石力学与工程学报,2008,27(12):2585-2591.HUANG Run-qiu,LI Wei-le.Research on development and distribution rules of geohazards induced by wenchuan earthquake on May12,2008[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(12):2585-2591.
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[11]郑颖人,赵尚毅.用有限元强度折减法求边(滑)坡支挡结构的内力[J].岩石力学与工程学报,2004,23(20):3552-3558.ZHENG Ying-ren,ZHAO Shang-yi.Calculation of inner force of support structure for landslide/slope by using strength reduction FEM[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(20):3552-3558.
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[13]赵尚毅,郑颖人,张玉芳.极限分析有限元法讲座—Ⅱ:有限元强度折减法中边坡失稳的判据探讨[J].岩土力学,2005,26(2):332-336.ZHAO Shang-yi,ZHENG Ying-ren,ZHANG Yu-fang.Study on slope failure criterion in strength reduction finite element method[J].Rock and Soil Mechanics,2005,26(2):332-336.
[14]Itasca Consulting Group,Inc..FLAC(Fast Lagrangian Analysis3D)User's Manual,Version3.0[R].USA:Itasca Consulting Group,Inc.,2003.
[15]李海波,肖克强,刘亚群.地震荷载作用下顺层岩质边坡安全系数分析[J].岩石力学与工程学报,2007,26(12):2385-2394.LI Hai-bo,XIAO Ke-qiang,LIU Ya-qun.Factor of safety analysis of bedding rock slope under seismic load[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(12):2385-2394.
[16]戴妙林,李同春.基于降强法数值计算的复杂岩质边坡动力稳定性安全评价[J].岩石力学与工程学报,2007,26(增刊1):2749-2754.DAI Miao-lin,LI Tong-chun.Analysis of dynamic stability safety evaluation for complex rock slopes by strength reduction numerical method[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(Supp.1):2749-2754.
[17]郑颖人,叶海林,黄润秋.地震边坡破坏机制及其破裂面的分析探讨[J].岩石力学与工程学报,2009,28(8):1714-1723.ZHENG Ying-ren,YE Hai-lin,HUANG Run-qiu.Discussion and analysis on falure mechanism and fracture surface of slope under earthquake effect[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(8):1714-1723.
[18]中国水利水电科学研究院.DL5073-2000水工建筑物抗震设计规范[S].北京:中国电力出版社,2001.
[19]胡聿贤.地震工程学[M].北京:地震出版社,1988.
[2]AUSILIO E,CONTE E,DENTE G.Seismic stability of reinforced slopes[J].Soil Dynamics and Earthquake Engineering,2000,19(3):159-172.
[3]中华人民共和国国土资源部.DZ/T0219-2006滑坡防治工程设计与施工技术规范[S].北京:中国标准出版社,2006.
[4]THOMAS W HOUSTONA,CARL J COSTANTINOB,UAZI HOSSAINC.Foundation design considerations for a pile supported critical facility[J].Soil Dynamics and Earthquake Engineering,2002,(22):1169-174.
[5]IZURU TAKEWAKI,AKIKO KISHIDA.Efficient analysis of pile-group effect on seismic stiffness nd strength design of buildings[J].Soil Dynamics and Earthquake Engineering,2005,(25):355-367.
[6]刘立平,李英民,韩军.桩-土-结构相互作用对结构弹塑性变形特性的影响[J].地震工程与工程振动,2007,27(5):66-71.LIU Li-ping,LI Ying-min,HAN Jun.Study on influence of pile-soil-structure dynamic interactionon structural elastoplastic deformation[J].Journal of Earthquake Engineering and Engineering Vibration,2007,27(5):66-71.
[7]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):1320-1323.YU Yu-zhen,DENG Li-jun.Centrifuge modeling of seismic behavior of slopes reinforced by stabilizingpile[J].Chinese Journal of Geotechnical Engineering,2007,29(9):1320-1323.
[8]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 Yu-zhen,LI Rong-jian,CHAI Lin,et al.Dynamic centrifuge test of slope reinforced with copper model piles[J].Hydrogeology and Engineering Geology,2008,(5):41-46.
[9]李荣建,于玉贞,吕禾.饱和砂土地基上抗滑桩加固边坡的动力离心模型试验研究[J].岩土力学,2009,30(4):897-902.LI Rong-jian,YU Yu-zhen,LüHe.Dynamic centrifuge modeling of piles-reinforced slope on saturated sandy foundation[J].Rock and Soil Mechanics,2009,30(4):897-902.
[10]汪鹏程,朱大勇,许强.强震作用下加固边坡的动力响应及不同加固方式的比较研究[J].合肥工业大学学报,2009,32(10):1501-1504.WANG Peng-cheng,ZHU Da-yong,XU Qiang.Dynamic response of slope subjected to intense earthquakes and effect comparison between various support modes[J].Journal of Hefei University of Technology,2009,32(10):1501-1504.
[11]郑颖人,赵尚毅.用有限元强度折减法求边(滑)坡支挡结构的内力[J].岩石力学与工程学报,2004,23(20):3552-3558.ZHENG Ying-ren,ZHAO Shang-yi.Calculation of inner force of support structure for landslide/slope by using strength reduction FEM[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(20):3552-3558.
[12]郑颖人,赵尚毅,张鲁渝.用有限元强度折减法进行边坡稳定分析[J].中国工程科学,2002,4(10):57-62.ZHENG Ying-ren,ZHAO Shang-yi,ZHANG Lu-yu.Slope stability analysis by strength reduction FEM[J].Engineering Science,2002,4(10):57-62.
[13]赵尚毅,郑颖人,张玉芳.极限分析有限元法讲座—Ⅱ:有限元强度折减法中边坡失稳的判据探讨[J].岩土力学,2005,26(2):332-336.ZHAO Shang-yi,ZHENG Ying-ren,ZHANG Yu-fang.Study on slope failure criterion in strength reduction finite element method[J].Rock and Soil Mechanics,2005,26(2):332-336.
[14]Itasca Consulting Group,Inc..FLAC(Fast Lagrangian Analysis3D)User's Manual,Version3.0[R].USA:Itasca Consulting Group,Inc.,2003.
[15]李海波,肖克强,刘亚群.地震荷载作用下顺层岩质边坡安全系数分析[J].岩石力学与工程学报,2007,26(12):2385-2394.LI Hai-bo,XIAO Ke-qiang,LIU Ya-qun.Factor of safety analysis of bedding rock slope under seismic load[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(12):2385-2394.
[16]戴妙林,李同春.基于降强法数值计算的复杂岩质边坡动力稳定性安全评价[J].岩石力学与工程学报,2007,26(增刊1):2749-2754.DAI Miao-lin,LI Tong-chun.Analysis of dynamic stability safety evaluation for complex rock slopes by strength reduction numerical method[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(Supp.1):2749-2754.
[17]郑颖人,叶海林,黄润秋.地震边坡破坏机制及其破裂面的分析探讨[J].岩石力学与工程学报,2009,28(8):1714-1723.ZHENG Ying-ren,YE Hai-lin,HUANG Run-qiu.Discussion and analysis on falure mechanism and fracture surface of slope under earthquake effect[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(8):1714-1723.
[18]中国水利水电科学研究院.DL5073-2000水工建筑物抗震设计规范[S].北京:中国电力出版社,2001.
[19]胡聿贤.地震工程学[M].北京:地震出版社,1988.
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