圆形洞室预应力锚索的地震动力响应
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摘要
针对锚索在本身预应力及动荷载作用下轴向力可能产生损失、降低抵抗洞室变形能力的问题,采用有限差分数值分析方法,通过构造简单洞室模型,分别对简化的地震动载荷进行纵向压缩、横向剪切数值模拟.结果表明:由于洞室尺寸相对于无限空间较小,动载荷作用时洞室几何形状引起的挠动有限,因此锚索内动应力引起的变化较小;锚索安装角对该作用力的大小有很大影响;波动频率越高,该作用力越大;波动的类型影响不大.
With regard to the potential decrease of the axial force of anchor cables and the resulting reduction of deformation resisting capacity of tunnels under their inherent stress and dynamic load,the finite different method was adopted.Based on a round tunnel model,the simplified dynamic seismic load of the tunnel supported by prestressed anchor cables was simulated under pressure waves and shear waves separately.The results show that because the tunnel dimension is far smaller than the infinite space,the seismic load leads to limited torsion of the tunnel,so the stress of the cables has small variation.The angle of the cables has great influences on the stress.The higher the earthquake frequency is,the larger the force is.The propagation type has few influences.
With regard to the potential decrease of the axial force of anchor cables and the resulting reduction of deformation resisting capacity of tunnels under their inherent stress and dynamic load,the finite different method was adopted.Based on a round tunnel model,the simplified dynamic seismic load of the tunnel supported by prestressed anchor cables was simulated under pressure waves and shear waves separately.The results show that because the tunnel dimension is far smaller than the infinite space,the seismic load leads to limited torsion of the tunnel,so the stress of the cables has small variation.The angle of the cables has great influences on the stress.The higher the earthquake frequency is,the larger the force is.The propagation type has few influences.
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’sassumption[J].Rock and Soil Mechanics,2009,30(4):915-920.(in Chinese))
[3]张永兴,饶枭宇,唐树名,等.压花锚锚固性能的试验研究与数值分析[J].岩石力学与工程学报,2008,27(3):607-614.(ZHANG Yong-xing,RAO Xiao-yu,TANGShu-ming,et al.Experimental study and numerical analysis of anchorage pregormance of bulb anchor cable[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(3):607-614.(in Chinese))
[4]曾华明,李祺,岳向红.张拉荷载下砂浆锚固岩石锚杆的力学分析[J].岩石力学与工程学报,2006,25(增刊2):3982-3986.(ZENG Hua-ming,LI Qi,YUE Xiang-hong.Analysis of mechanical behavior of fully grouted rock bolt under tensile load[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(Sup2):3982-3986.(in Chinese)).
[5]洪海春,徐卫亚.地震作用下岩体锚固性能研究综述与展望[J].金属矿山,2006(3):5-10.(HONG Hai-chun,XU Wei-ya.Reviewand prospect of anchorage properties of reinforced rockmass under earthquake[J].Metal Mine,2006(3):5-10.(in Chinese)).
[6]杨苏杭,梁斌,顾金才等.锚固洞室抗爆模型试验锚索预应力变化特性研究[J].岩石力学与工程学报,2006,25(增刊2):3749-3756.(YANGSu-hang,LIANG Bin,GUJin-cai,et al.Research on characteristics of prestress change of anchorage cable in anti-explosion model test of anchored cavern[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(Sup2):3749-3756.(in Chinese)).
[7]TANNANTD D,BRUMMER R K.Rock bolt behavior under dynamic loadingfieldtest sand modeling[J].International Journal of Rock Mechanics and Mining Sciences&Geomechanics Abstracts,1995,32(6):537-550.
[8]ORTLEPP WD,STACEY TR.Performance of tunnel support under large deformation static and dynamic loading[J].Tunneling and Underground Space Technology,1998,13(1):15-21.
[9]王光勇,徐平,李桂林.爆炸荷载作用下锚杆动载响应和加固机理数值分析[J].工程爆破,2008,14(4):5-8.(WANG Guang-yong,XUPing,LI Gui-lin.Numerical analysis on dynamic response and reinforcement mechanics of rock bolts under explosive loads[J].Engineering Blasting,2008,14(4):5-8.(in Chinese))
[10]闫毅志,张燎军,杨具瑞,等.预应力锚索锚固效果的三维数值模拟研究[J].中国农村水利水电,2008(11):62-65.(YAN Yi-zhi,ZHANGLiao-jun,YANGJu-rui,et al.Research on3Dnumerical simulation of pre-stressed cable of anchoring effect[J].China Rural Water and Hydropower,2008(11):62-65.(in Chinese))
[11]薛亚东,张世平,康天合.回采巷道锚杆动载响应的数值分析[J].岩石力学与工程学报,2003,22(11):1903-1906.(XUE Ya-dong,ZHANGShi-ping,KANGTian-he.Numerical analysis on dynamic response of rock bolts in mining roadway[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(11):1903-1906.(in Chinese))
[12]戴林岐.影响岩体预应力锚固效果的主要因素[M].北京:地震出版社,1992:10-18.
[13]陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2008:157-160.
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