高饱和度饱和土中爆炸波与结构的相互作用
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摘要
利用改进的φ2.5mm×5m的模拟爆炸装置进行了一系列爆炸波与结构相互作用的实验,得出了爆炸波作用下结构上的表面压力、动量、应变的实测波形。实验结果表明,由于结构刚度较小,在相同爆心距离条件下结构的荷载与自由场的压力值相差不大;荷载在顶板的分布较为均匀,结构在爆炸载荷作用下发生整体变形,可以用中心荷载代替整体荷载;结构对爆炸波的反射,无论是弹性波还是冲击波,反射规律基本一致。随着饱和度的增大,结构上的反射系数和爆炸冲击波波速也随之增大。
Using φ2.5 mm×5 m pothole,the experimental study of the interaction between blast wave and structure in highly saturated soils is accomplished systematically.According to recorded waveforms of stress,strain and momentum,the experimental results are interpreted.The experimental results indicate that blast loads on structure are not much more than value of pressure in free field;loads on roof of structure are more uniform than expected value;the overall deformation of structure is generated under blast loads,central loads are used to take place the entire loads;whether or not there is the shock wave,the law of reflection is the same;blast wave velocity and the reflection coefficient of structure increase with saturation degree.
Using φ2.5 mm×5 m pothole,the experimental study of the interaction between blast wave and structure in highly saturated soils is accomplished systematically.According to recorded waveforms of stress,strain and momentum,the experimental results are interpreted.The experimental results indicate that blast loads on structure are not much more than value of pressure in free field;loads on roof of structure are more uniform than expected value;the overall deformation of structure is generated under blast loads,central loads are used to take place the entire loads;whether or not there is the shock wave,the law of reflection is the same;blast wave velocity and the reflection coefficient of structure increase with saturation degree.
引文
[1]LIANG JIAN-WEN,YOU HONG-BING.Dynamic stiffness matrix of a poroelastic mutli-layered site and its Green’s functions[J].Earthquake Engineering and Engineering Vibration,2004,3(2):273-282.
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[14]陆建飞,聂卫东.饱和土中单桩在瑞利波作用下的动力响应[J].岩土工程学报,2008,30(2):225-232.LU Jian-fei,NIE Wei-dong.Dynamic response of single pile embedded in half-space saturated soil subjected to rayleigh waves[J].Chinese Journal of Geotechnical Engineering,2008,30(2):225-232.
[15]夏唐代,薛威,颜可珍.准饱和土中的瑞利波弥散特性[J].江南大学学报(自然科学版),2007,6(1):76-80.XIA Tang-dai,XUE Wei,YAN Ke-zhen.Dispersion of rayleigh wave in a nearly saturated soil[J].Journal of Southern Yangtze University(Natural Science Edition),2007,6(1):76-80.
[16]李立云,杜修力.动载作用下饱和土壤液化的研究述评[J].世界地震工程,2006,22(2):39-49.LI Li-yun,DU Xiu-li.Review on the liquefaction research of saturated soils under dynamic load[J].World Earthquake Engineering,2006,22(2):39-49.
[17]蔡袁强,李保忠.饱和度变化对弹性波在非饱和砂岩表面反射和透射的影响[J].岩石力学与工程学报,2006,25(3):520-521.CAI Yuan-qiang,LI Bao-zhong.Effect of water saturation on reflection and transmission of elastic waves at interface of partially saturated sandstone[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(3):520-521.
[18]徐平,夏唐代.饱和度对准饱和土体中瑞利波传播特性的影响[J].振动与冲击,2008,27(4):10-13.XU Ping,XIA Tang-dai.Influence of saturation degreeon propagation characteristics of Rayleighwaves in nearly saturated soils[J].Journal of Vibration and Shock,2008,27(4):10-13.
[2]LIANG JIANWEN,YOU HONGBING.Green's functions for uniformly distributed loads acting on an inclined line in a poroelastic layered site[J].Earthquake Engineering and Engineering Vibration,2005,4(2):233-241.
[3]BIOT M A.Theory of propagation of elastic waves in a fluid saturated porous solid[J].Journal of Acoust,1956,28(2):168-191.
[4]DONTSOV V E,NAKORYAKOV V E.Enhancement of shock waves in a porous medium saturated with a liquid containing soluble-gas bubbles[J].International Journal of Multiphase Flow,2001,27(11):2023-2041.
[5]WANG Zhong-qi,HAO Hong,LU Yong.A three-phase soil model for simulating stress wave propagation due to blast loading[J].International Journal for Numerical and Analytical Methods in Geomechanics,2004,28(1):33-56.
[6]PRAPAHARAN S,CHAMEAU J L,HOLTZ R D.Effect of strain rate on undrained strength derived from pressure meter tests[J].Geotechnique,1989,39(4):615-624.
[7]赵跃堂,梁晖,范斌.饱和土中爆炸波传播问题的数值模拟[J].爆炸与冲击,2007,27(4):352-357.ZHAO Yue-tang,LIANG Hui,FAN Bin.Numerical simulation of explosion wave propagation in the saturated soil[J].Explosion and Shock Waves,2007,27(4):352-357.
[8]王明洋,赵跃堂,钱七虎.饱和砂土动力特性及数值方法研究[J].岩土工程程学报,2002,24(6):723-729.WANG Ming-yang,ZHAO Yue-tang,QIAN Qi-hu.Study of dynamic behaviour and numerical method for saturated sand[J].Chinese Journal of Geotechnical Engineering,2002,24(6):732-729.
[9]国胜兵,高培正,潘越峰,等.爆炸波在准饱和砂土中的传播规律[J].岩土力学,2004,25(12):1897-1902.GUO Sheng-bing,GAO Pei-zheng,PAN Yue-feng,et al.Explosive wave propagation in quasi-saturated sandy soil[J].Rock and Soil Mechanics,2004,25(12):1897-1902.
[10]孙美凤.爆炸荷载作用下饱和土中地下建筑结构的动力响应[J].华北水利水电学院学报,2004,25(2):18-21.SUN Mei-feng.The structure dynamical response in saturated soil to blasting loads[J].Journal of North China Institute of Water Conservancy and Hydroelectic Power,2004,25(2):18-21.
[11]杨海杰,钱七虎,赵跃堂,等.三相饱和土爆炸液化机理模型研究[J].解放军理工大学学报,2001,2(1):70-73.YANG Hai-jie,QIAN Qi-hu,ZHAO Yue-tang,et al.Study on blast induced liquefaction model for3phase saturated soil[J].Journal of PLA University of Science and Technology,2001,2(1):70-73.
[12]刘建新,宋华,赵跃堂,等.准饱和砂土中平面压缩波传播[J].防灾减灾工程学报,2004,24(1):86-92.LIU Jian-xin,SONG Hua,ZHAO Yue-tang,et al.Propagation of plane compress wave in quasic saturated sandy soil[J].Journal of Disaster Prevention and Mitigation Engineering,2004,24(1):86-92.
[13]尤红兵,梁建文,赵凤新.含饱和土的层状场地的动力响应[J].岩土力学,2008,29(3):679-684.YOU Hong-bing,LIANG Jian-wen,ZHAO Feng-xin.Dynamic responses of a multilayered site with saturated soils[J].Rock and Soil Mechanics,2008,29(3):679-684.
[14]陆建飞,聂卫东.饱和土中单桩在瑞利波作用下的动力响应[J].岩土工程学报,2008,30(2):225-232.LU Jian-fei,NIE Wei-dong.Dynamic response of single pile embedded in half-space saturated soil subjected to rayleigh waves[J].Chinese Journal of Geotechnical Engineering,2008,30(2):225-232.
[15]夏唐代,薛威,颜可珍.准饱和土中的瑞利波弥散特性[J].江南大学学报(自然科学版),2007,6(1):76-80.XIA Tang-dai,XUE Wei,YAN Ke-zhen.Dispersion of rayleigh wave in a nearly saturated soil[J].Journal of Southern Yangtze University(Natural Science Edition),2007,6(1):76-80.
[16]李立云,杜修力.动载作用下饱和土壤液化的研究述评[J].世界地震工程,2006,22(2):39-49.LI Li-yun,DU Xiu-li.Review on the liquefaction research of saturated soils under dynamic load[J].World Earthquake Engineering,2006,22(2):39-49.
[17]蔡袁强,李保忠.饱和度变化对弹性波在非饱和砂岩表面反射和透射的影响[J].岩石力学与工程学报,2006,25(3):520-521.CAI Yuan-qiang,LI Bao-zhong.Effect of water saturation on reflection and transmission of elastic waves at interface of partially saturated sandstone[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(3):520-521.
[18]徐平,夏唐代.饱和度对准饱和土体中瑞利波传播特性的影响[J].振动与冲击,2008,27(4):10-13.XU Ping,XIA Tang-dai.Influence of saturation degreeon propagation characteristics of Rayleighwaves in nearly saturated soils[J].Journal of Vibration and Shock,2008,27(4):10-13.
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