框架预应力锚杆边坡支护结构抗震简化设计方法
摘要
为了能够准确地进行框架预应力锚杆边坡支护结构动力分析及抗震设计,通过对该类结构进行震害分析,推导出地震作用下动土压力计算公式,建立了框架预应力锚杆支护结构的动力计算模型,并采用力法进行了求解。基于建立的动力分析模型和震害模式,给出了其抗震设计方法。考虑了地震响应沿坡高放大效应,根据极限平衡理论和破坏模式建立了框架预应力锚杆边坡支护结构的动力稳定性验算模型。将提出的方法应用于工程实例,并用有限元法进行了对比分析。结果表明:提出的分析模型具有较高的精度,是一种简单、实用的分析与设计方法;地震作用下最危险截面发生在边坡中偏上部位;梁柱截面尺寸是延性设计和发生斜压破坏的主要控制因素。
To be able to accurately carry out dynamic analysis and seismic design of the frame supporting structure with prestressed anchors,seismic damage modes of frame supporting structure with prestressed anchors were analyzed.The calculation formula of anchoring slope dynamic earth pressure was deduced under earthquake.Dynamic calculation model of frame supporting structure with prestressed anchors was established and the solutions were derived by force method.Seismic design methods were established based on proposed calculation model.Considering the amplification effect of seismic response along the slope depth on the stability of slope,a calculation method for dynamic stability of slope frame supporting structure with prestressed anchors was set up according to the damage modes and the limit equilibrium theory.Finally the proposed method was applied in an actual engineering project.The finite element software was used to analyze the seismic performance of this case in order to verify the proposed method.The results indicate that the proposed method has higher accuracy,and is simple and practical.Under earthquake the most dangerous section occurs at the upper part of slopes,and the section size of the beam and the column is the main control factor of ductility design and baroclinic destruction.
To be able to accurately carry out dynamic analysis and seismic design of the frame supporting structure with prestressed anchors,seismic damage modes of frame supporting structure with prestressed anchors were analyzed.The calculation formula of anchoring slope dynamic earth pressure was deduced under earthquake.Dynamic calculation model of frame supporting structure with prestressed anchors was established and the solutions were derived by force method.Seismic design methods were established based on proposed calculation model.Considering the amplification effect of seismic response along the slope depth on the stability of slope,a calculation method for dynamic stability of slope frame supporting structure with prestressed anchors was set up according to the damage modes and the limit equilibrium theory.Finally the proposed method was applied in an actual engineering project.The finite element software was used to analyze the seismic performance of this case in order to verify the proposed method.The results indicate that the proposed method has higher accuracy,and is simple and practical.Under earthquake the most dangerous section occurs at the upper part of slopes,and the section size of the beam and the column is the main control factor of ductility design and baroclinic destruction.
引文
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[12]叶海林,黄润秋,郑颖人,等.岩质边坡锚杆支护参数地震敏感性分析[J].岩土工程学报,2010,32(9):1374-1379.YE Hai-lin,HUANG Run-qiu,ZHENG Ying-ren,et al.Sensitivity Analysis of Parameters for Bolts in Rock Slopes Under Earthquakes[J].Chinese Journal of Geotechnical Engineering,2010,32(9):1374-1379.
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[16]汪益敏,BATHURST R J.振动条件下EPS缓冲对挡土墙受力与变形影响的水平条分法模型研究[J].土木工程学报,2008,41(10):73-80.WANG Yi-min,BATHURST R J.Horizontal Slice Method for Force and Displacement Analysis of EPS Geofoam Seismic Buffers for Rigid Retaining Walls[J].China Civil Engineering Journal,2008,41(10):73-80.
[17]朱彦鹏,罗晓辉,周勇.支挡结构设计[M].北京:高等教育出版社,2008.ZHU Yan-peng,LUO Xiao-hui,ZHOU Yong.Retai-ning Wall Design[M].Beijing:Higher Education Press,2008.
[18]GB50010—2002,混凝土结构设计规范[S].GB50010—2002,Code for Design of Concrete Struc-tures[S].
[19]GB50011—2010,建筑抗震设计规范[S].GB50011—2010,Code for Seismic Design of Build-ings[S].
[20]朱彦鹏,田稳苓,马成松.混凝土结构设计[M].上海:同济大学出版社,2004.ZHU Yan-peng,TIAN Wen-ling,MA Cheng-song.Concrete Structure Design[M].Shanghai:Tongji Uni-versity Press,2004.
[21]朱慈勉.结构力学[M].北京:高等教育出版社,2004.ZHU Ci-mian.Structural Mechanics[M].Beijing:Higher Education Press,2004.
[22]贺可强,王胜利,阳吉宝.运用遗传算法求解土钉支护结构的整体稳定性系数[J].岩土力学,2003,24(3):355-358.HE Ke-qiang,WANG Sheng-li,YANG Ji-bao.The Research of Genetic Algorithms Applied to Solving Coefficient of Integral Stability of Soil-nail Braced Structure[J].Rock and Soil Mechanics,2003,24(3):355-358.
[2]彭建兵,马润勇,范文,等.汶川大震的科学思考[J].地球科学与环境学报,2009,31(1):1-29.PENG Jian-bing,MA Run-yong,FAN Wen,et al.Sci-ence Contemplation for Wenchuan Earthquake of12 May,2008[J].Journal of Earth Sciences and Environ-ment,2009,31(1):1-29.
[3]苏生瑞,张永双,李松,等.汶川地震引发高速远程滑坡运动机理数值模拟研究——以谢家店子滑坡为例[J].地球科学与环境学报,2010,32(3):277-287.SU Sheng-rui,ZHANG Yong-shuang,LI Song,et al.Numerical Analysis on Motion Mechanism of Highspeed and Long Runout Landslide by Wenchuan Earthquake:Taking Xiejiadianzi Landslide as an Example[J].Journal of Earth Sciences and Environment,2010,32(3):277-287.
[4]王晓荣,蒋育华.预应力锚索在高边坡病害治理工程中的应用[J].岩石力学与工程学报,2003,22(增2):2731-2733.WANG Xiao-rong,JIANG Yu-hua.Application of Prestressed Anchor Cable to Control Engineering of High Slope Disaster[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(S2):2731-2733.
[5]张永防,王秉勇.用锚杆框架护坡加固南昆线膨胀土边坡的研究[J].铁道工程学报,2000(3):92-95.ZHANG Yong-fang,WANG Bing-yong.Study on Strengthening Expansive Soil Side Slope Nan-Kun Railway by Using Revetment with Anchor Bolt Frame[J].Journal of Railway Engineering Society,2000(3):92-95.
[6]杨杰.高速公路路堑边坡加固预应力锚索施工技术与质量控制[J].岩石力学与工程学报,2003,22(增2):2759-2764.YANG Jie.Construction Technique and Quality Control of Prestressed Cables for Stabilizing Cutting Slopes of Expressway[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(S2):27592764.
[7]李忠,朱彦鹏.框架预应力锚杆边坡支护结构稳定性计算方法及其应用[J].岩石力学与工程学报,2005,24(21):3922-3926.LI Zhong,ZHU Yan-peng.Stability Calculation Methods for Grillage Supporting Structure with Pres-tressed Anchor and Its Application[J].Chinese Jour-nal of Rock Mechanics and Engineering,2005,24(21):3922-3926.
[8]汪班桥,门玉明.土层锚杆模型试验研究[J].地球科学与环境学报,2009,31(2):195-199.WANG Ban-qiao,MEN Yu-ming.Analysis by Model Test on Anchors in Clay[J].Journal of Earth Sciences and Environment,2009,31(2):195-199.
[9]董建华.黄土地区深基坑柔性支护结构弹塑性有限元分析[D].兰州:兰州理工大学,2006.DONG Jian-hua.Elastic-plastic FEM Analysis on Flexible Retaining and Protection Structures of Deep Excavation in Loess Region[D].Lanzhou:Lanzhou University of Technology,2006.
[10]邵勇,覃仁辉.预应力锚索框架梁边坡支护数值模拟[J].地球科学与环境学报,2010,32(3):307-310.SHAO Yong,QIN Ren-hui.Numerical Simulation of Slope Supporting for Prestressed Anchor with Frame Beam[J].Journal of Earth Sciences and Environment,2010,32(3):307-310.
[11]石玉成,秋仁东,孙军杰,等.地震作用下预应力锚索加固危岩体的动力响应分析[J].岩土力学,2011,32(4):1157-1162.SHI Yu-cheng,QIU Ren-dong,SUN Jun-jie,et al.A-nalysis of Dynamic Response of Dangerous Rock Mass Reinforced by Prestressed Anchor Cables Under Seis-mic Loads[J].Rock and Soil Mechanics,2011,32(4):1157-1162.
[12]叶海林,黄润秋,郑颖人,等.岩质边坡锚杆支护参数地震敏感性分析[J].岩土工程学报,2010,32(9):1374-1379.YE Hai-lin,HUANG Run-qiu,ZHENG Ying-ren,et al.Sensitivity Analysis of Parameters for Bolts in Rock Slopes Under Earthquakes[J].Chinese Journal of Geotechnical Engineering,2010,32(9):1374-1379.
[13]CAI Z,BATHURST R J.Seismic Response Analysis of Geosynthetic Reinforced Soil Segmental Retaining Walls by Finite Element Method[J].Computers and Geotechnics,1995,17(4):523-546.
[14]GB50330—2002,建筑边坡工程技术规范[S].GB50330—2002,Technical Code for Building Slope Engineering[S].
[15]DL5073—2000,水工建筑物抗震设计规范[S].DL5073—2000,Specifications for Seismic Design of Hydraulic Structures[S].
[16]汪益敏,BATHURST R J.振动条件下EPS缓冲对挡土墙受力与变形影响的水平条分法模型研究[J].土木工程学报,2008,41(10):73-80.WANG Yi-min,BATHURST R J.Horizontal Slice Method for Force and Displacement Analysis of EPS Geofoam Seismic Buffers for Rigid Retaining Walls[J].China Civil Engineering Journal,2008,41(10):73-80.
[17]朱彦鹏,罗晓辉,周勇.支挡结构设计[M].北京:高等教育出版社,2008.ZHU Yan-peng,LUO Xiao-hui,ZHOU Yong.Retai-ning Wall Design[M].Beijing:Higher Education Press,2008.
[18]GB50010—2002,混凝土结构设计规范[S].GB50010—2002,Code for Design of Concrete Struc-tures[S].
[19]GB50011—2010,建筑抗震设计规范[S].GB50011—2010,Code for Seismic Design of Build-ings[S].
[20]朱彦鹏,田稳苓,马成松.混凝土结构设计[M].上海:同济大学出版社,2004.ZHU Yan-peng,TIAN Wen-ling,MA Cheng-song.Concrete Structure Design[M].Shanghai:Tongji Uni-versity Press,2004.
[21]朱慈勉.结构力学[M].北京:高等教育出版社,2004.ZHU Ci-mian.Structural Mechanics[M].Beijing:Higher Education Press,2004.
[22]贺可强,王胜利,阳吉宝.运用遗传算法求解土钉支护结构的整体稳定性系数[J].岩土力学,2003,24(3):355-358.HE Ke-qiang,WANG Sheng-li,YANG Ji-bao.The Research of Genetic Algorithms Applied to Solving Coefficient of Integral Stability of Soil-nail Braced Structure[J].Rock and Soil Mechanics,2003,24(3):355-358.
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