地震作用下预应力锚索加固危岩体的动力响应分析
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摘要
针对预应力锚索加固危岩体的特点,以某危岩体加固工程的3个典型工程剖面为实例,通过对不同动荷载作用下预应力锚索加固的危岩位移场、应力场分布特征的数值模拟计算,揭示了预应力锚索加固危岩体在地震作用下的动态响应和变化规律。分析结果表明,随着地震动峰值加速度(PGA)、反应谱特征周期(Tg)的增大,被加固危岩体的位移和应力值明显增大,应力集中区的范围扩大,围岩损伤的可能性增加,稳定性降低。其成果为危岩体抗震加固与减灾提供理论基础和实践依据。
Aiming at the characteristics of dangerous rock mass reinforced by prestressed anchor cables,displacement field and stress field distributions are simulated under different seismic loads;and based on three typical sections of a reinforced dangerous rock mass project,dynamic response and variations are revealed.The analysis results show that the displacements and stresses of the reinforced dangerous rock mass increase obviously with the increase of seismic dynamic peak acceleration(PGA) and characteristic period of response spectrum(Tg).Range of stress concentration expands;probability of surrounding rock damage increases and stability decreases.The results can provide theoretical basis and practical reference for aseismic reinforcement and disaster mitigation of dangerous rock mass.
Aiming at the characteristics of dangerous rock mass reinforced by prestressed anchor cables,displacement field and stress field distributions are simulated under different seismic loads;and based on three typical sections of a reinforced dangerous rock mass project,dynamic response and variations are revealed.The analysis results show that the displacements and stresses of the reinforced dangerous rock mass increase obviously with the increase of seismic dynamic peak acceleration(PGA) and characteristic period of response spectrum(Tg).Range of stress concentration expands;probability of surrounding rock damage increases and stability decreases.The results can provide theoretical basis and practical reference for aseismic reinforcement and disaster mitigation of dangerous rock mass.
引文
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[2]宗全兵,徐卫亚.基于局部变形理论的非均质地层中预应力锚固受力分析[J].岩土力学,2009,30(4):915-920.ZONG Quan-bing,XU Wei-ya.Analytical approach for prestressed anchor embedded in non-homogeneous stratum based on Winkler’s assumption[J].Rock and Soil Mechanics,2009,30(4):915-920.
[3]战玉宝,毕宣可,尤春安.预应力锚索锚固段应力分布影响因素分析[J].土木工程学报,2007,40(6):49-53.ZHAN Yu-bao,BI Xuan-ke,YOU Chun-an.Analysis of factors influencing the stress distribution in prestressed cables[J].China Civil Engineering Journal,2007,40(6):49-53.
[4]赵晓彦,蒋楚生,熊自英.单锚类土质边坡锚固预应力传递规律的研究[J].岩土力学,2010,31(2):559-564.ZHAO Xiao-yan,JIANG Chu-sheng,XIONG Zi-ying.Study of transferring mode of prestressed force in singly anchored soil-like slopes[J].Rock and Soil Mechanics,2010,31(2):559-564.
[5]李海波,蒋会军,赵坚,等.动荷载作用下岩体工程安全的几个问题[J].岩石力学与工程学报,2003,22(11):1887-1891.LI Hai-bo,JIANG Hui-jun,ZHAO Jian,et al.Some problems about safety analysis of rock engineering under dynamic load[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(11):1887-1891.
[6]SHARMA S,JUDD W R.Underground opening damage from earthquake[J].Engineering Geology,1991,30:263-276.
[7]王芝银,杨志法,王思敬.岩石力学位移反演分析回顾及进展[J].力学进展,1998,28(4):488-498.WANG Zhi-yin,YANG Zhi-fa,WANG Si-jing.A review on inverse analysis of displacements in rock mechanics[J].Advances in Mechanics,1998,28(4):488-498.
[8]朱彦鹏,董建华.土钉支护边坡动力模型的建立及地震响应分析[J].岩土力学,2010,31(4):1013-1022.ZHU Yan-peng,DONG Jian-hua.Dynamic calculation model and seismic response for slope protected by soil nailing under earthquake[J].Rock and Soil Mechanics,2010,31(4):1013-1022.
[9]陈卫忠,朱维申,王宝林,等.节理岩体中洞室围岩大变形数值模拟及模型试验研究[J].岩石力学与工程学报,1998,17(3):223-229.CHEN Wei-zhong,ZHU Wei-shen,WANG Bao-lin,et al.Numerical simulation and testing study of large deformation for cavern’s surrounding jointed rockmass[J].Chinese Journal of Rock Mechanics and Engineering,1998,17(3):223-229.
[10]Itasca Consulting Group Inc.Universal distinct element code(version 3.1)user’s manual[M].Minneapolis,USA:Itasca Consulting Group Inc.,1999.
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