爆炸荷载作用下两相饱和土中结构响应试验研究
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摘要
通过试验研究含气量低于99.99%两相饱和土及其中的结构响应问题。试验在φ2.5m×5m的圆柱形模拟爆炸装置中进行,爆炸采用TNT集团装药,炸药埋设在饱和土中进行接触爆炸,采用统一比例埋深。在饱和土中设置正方体大跨度结构,该结构产生整体破坏。同时研究完全不动钢壁极限结构,与大跨度结构进行对比,系统研究饱和土中不同结构形式的反射系数。结果表明,在两相饱和土中压力超过2MPa时,饱和土发生动态液化,应力波变化为冲击波,其中压力与饱和土的具体颗粒性质关系不大。通过极限状态的两种结构响应研究认为,饱和土中不同跨度结构的反射系数为0.5～2.0,其具体取值将根据结构形式决定。
The two-phase saturated soil with air content less than 99.99% and structural response are investigated by experiments,and explosion experiments are conducted by cylindrical simulating explosion device with sizes of φ 2.5m×5 m.Mass charges of TNT are adopted and buried in the saturated soil to carry out contact explosion with unified proportional buried depth.Square large-span structures are set in the saturated soil,and overall damage appears for these structures.At the same time,limit structures of complete immobility wall are investigated.By the comparison with large-span structures,reflection factors of different types of structures are systematically researched.Experimental investigation indicates that,if the pressure in the two-phase saturated soil is more than 2 MPa,the dynamic liquefaction appears in the saturated soil,and stress waves are changed into shock waves.The pressure has little relation with specific particle properties of saturated soil.By means of research on two kinds of structural responses at limit state,the result shows that the reflection factor of the structures with different spans in saturated soil is 0.5-2.0,and its value is decided by structural forms.
The two-phase saturated soil with air content less than 99.99% and structural response are investigated by experiments,and explosion experiments are conducted by cylindrical simulating explosion device with sizes of φ 2.5m×5 m.Mass charges of TNT are adopted and buried in the saturated soil to carry out contact explosion with unified proportional buried depth.Square large-span structures are set in the saturated soil,and overall damage appears for these structures.At the same time,limit structures of complete immobility wall are investigated.By the comparison with large-span structures,reflection factors of different types of structures are systematically researched.Experimental investigation indicates that,if the pressure in the two-phase saturated soil is more than 2 MPa,the dynamic liquefaction appears in the saturated soil,and stress waves are changed into shock waves.The pressure has little relation with specific particle properties of saturated soil.By means of research on two kinds of structural responses at limit state,the result shows that the reflection factor of the structures with different spans in saturated soil is 0.5-2.0,and its value is decided by structural forms.
引文
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[6]姜领发,王建华,周香莲.半空间饱和土中圆形衬砌对弹性压缩波的散射[J].岩土力学,2008,29(2):315-320.(JIANG Lingfa,WANG Jianhua,ZHOU Xianglian.Scattering around a circular lining in saturated poroelastic half-space under dilatational waves[J].Rock and Soil Mechanics,2008,29(2):315-320.(in Chinese))
[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 Yuetang,LIANG Hui,FAN Bin.Numerical simulation of explosion wave propagation in the saturated soil[J].Explosion and Shock Waves,2007,27(4):352-357.(in Chinese))
[8]ZHOU X M,XIA T D,XU P,et al.Seismic reflection and transmission coefficients at an air-water interface of saturated porous soil[J].Acta Seismologica Sinica,2006,27(4):397-405.
[9]叶陈江,史焱永,蔡袁强.S波由饱和土入射于弹性土时在界面上的反射与透射[J].振动与冲击,2005,24(2):41-45.(YE Chenjiang,SHI Yanyong,CAI Yuanqiang.Reflection and refraction at the interface when S waves propagate from saturated soil to elastic soil[].Journal of Vibration and Shock,2005,24(2):41-45.(in Chinese))
[10]李晓欣,李亮,杜修力.饱和土动力问题求解的隐-隐格式交替解法[J].地下空间与工程学报,2008,4(5):806-809.(JIANG Xiaoxin,LI Liang,DU Xiuli.An implicit-implicit staggered algorithm for dynamic problems of saturated soil[J].Chinese Journal of Underground Space and Engineering,2008,4(5):806-809.(in Chinese))
[11]徐平,夏唐代.弹性波在准饱和土和弹性土界面的反射与透射[J].力学与实践,2006,28(6):58-63.(XU Ping,XIA Tangdai.Reflection and transmission of elastic wave at the interface of nearly saturated soil and elastic soil[J].Mechanics in Engineering,2006,28(6):58-63.(in Chinese))
[12]金良跃,王喜时,李春贵,等.高饱和度非饱和土一维固结解析解及其应用[J].浙江水利科技,2008,(5):39-43.(JIN Liangyue,WANG Xishi,LI Chungui,et al.One-dimensional consolidation analytic solution of unsaturated soil with high saturation degree and its application[J].Zhejiang Hydrotechnics,2008,(5):39-43.(in Chinese))
[13]李伟华.饱和土中浅圆弧状埋置基础对平面P波散射解答[J].华南地震,2008,28(1):11-20.(LI Weihua.Scattering and diffraction of plane P waves by shallow circular-arc foundations imbedded in saturated soil[J].South China Journal of Seismology,2008,28(1):11-20.(in Chinese))
[14]郑荣跃,刘干斌,梧松.半空间饱和土内置点载荷作用下的热弹性波动[J].力学学报,2008,40(3):413-420.(ZHENG Rongyue,LIU Ganbin,WU Song.Coupling thermo-hydro-mechanical dynamic response of saturated soil subjected to internal excitation[J].Chinese Journal of Theoretical and Applied Mechanics,2008,40(3):413-420.(in Chinese))
[15]龙红兵,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.(LONG Hongbing,LIANG Jianwen,ZHAO Fengxin.Dynamic responses of a multilayered site with saturated soils[J].Rock and Soil Mechanics,2008,29(3):679-684.(in Chinese))
[2]赵跃堂,郑大亮,王明洋,等.饱和土介质中爆炸波传播的时间特征试验研究[J].防灾减灾工程学报,2004,24(2):162-167.(ZHAO Yuetang,ZHENG Daliang,WANG Mingyang,et al.Experimental investigation on time characteristics of explosive wave propagation[J].Journal of Disaster Prevention and Mitigation Engineering,2004,24(2):162-167.(in Chinese))
[3]李伟华.饱和度对波在土层交界面的反射、透射系数的影响[J].西北地震学报,2002,24(4):303-309.(LI Weihua.Influence of water saturation on seismic reflection and transmission coefficients at a mainly water-saturated porous soil interface[J].Northwestern Seismological Journal,2002,24(4):303-309.(in Chinese))
[4]王明洋,杨林德,钱七虎.爆炸波在饱和土中与障碍物相互作用的解析解法[J].同济大学学报,1997,25(2):200-205.(WANG Mingyang,YANG Lingde,QIAN Qihu.Analytical method of explosive loading interaction with obstacle in saturated soil[J].Journal of Tongji University,1997,25(2):200-205.(in Chinese))
[5]黎丹,王兵团.应力的反射系数和透射系数[J].北方交通大学学报,2003,27(3):27-31.(LI Dan,WANG Bingtuan.Reflection coefficients and transmission coefficients of the stress[J].Journal of Northern Jiaotong University,2003,27(3):27-31.(in Chinese))
[6]姜领发,王建华,周香莲.半空间饱和土中圆形衬砌对弹性压缩波的散射[J].岩土力学,2008,29(2):315-320.(JIANG Lingfa,WANG Jianhua,ZHOU Xianglian.Scattering around a circular lining in saturated poroelastic half-space under dilatational waves[J].Rock and Soil Mechanics,2008,29(2):315-320.(in Chinese))
[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 Yuetang,LIANG Hui,FAN Bin.Numerical simulation of explosion wave propagation in the saturated soil[J].Explosion and Shock Waves,2007,27(4):352-357.(in Chinese))
[8]ZHOU X M,XIA T D,XU P,et al.Seismic reflection and transmission coefficients at an air-water interface of saturated porous soil[J].Acta Seismologica Sinica,2006,27(4):397-405.
[9]叶陈江,史焱永,蔡袁强.S波由饱和土入射于弹性土时在界面上的反射与透射[J].振动与冲击,2005,24(2):41-45.(YE Chenjiang,SHI Yanyong,CAI Yuanqiang.Reflection and refraction at the interface when S waves propagate from saturated soil to elastic soil[].Journal of Vibration and Shock,2005,24(2):41-45.(in Chinese))
[10]李晓欣,李亮,杜修力.饱和土动力问题求解的隐-隐格式交替解法[J].地下空间与工程学报,2008,4(5):806-809.(JIANG Xiaoxin,LI Liang,DU Xiuli.An implicit-implicit staggered algorithm for dynamic problems of saturated soil[J].Chinese Journal of Underground Space and Engineering,2008,4(5):806-809.(in Chinese))
[11]徐平,夏唐代.弹性波在准饱和土和弹性土界面的反射与透射[J].力学与实践,2006,28(6):58-63.(XU Ping,XIA Tangdai.Reflection and transmission of elastic wave at the interface of nearly saturated soil and elastic soil[J].Mechanics in Engineering,2006,28(6):58-63.(in Chinese))
[12]金良跃,王喜时,李春贵,等.高饱和度非饱和土一维固结解析解及其应用[J].浙江水利科技,2008,(5):39-43.(JIN Liangyue,WANG Xishi,LI Chungui,et al.One-dimensional consolidation analytic solution of unsaturated soil with high saturation degree and its application[J].Zhejiang Hydrotechnics,2008,(5):39-43.(in Chinese))
[13]李伟华.饱和土中浅圆弧状埋置基础对平面P波散射解答[J].华南地震,2008,28(1):11-20.(LI Weihua.Scattering and diffraction of plane P waves by shallow circular-arc foundations imbedded in saturated soil[J].South China Journal of Seismology,2008,28(1):11-20.(in Chinese))
[14]郑荣跃,刘干斌,梧松.半空间饱和土内置点载荷作用下的热弹性波动[J].力学学报,2008,40(3):413-420.(ZHENG Rongyue,LIU Ganbin,WU Song.Coupling thermo-hydro-mechanical dynamic response of saturated soil subjected to internal excitation[J].Chinese Journal of Theoretical and Applied Mechanics,2008,40(3):413-420.(in Chinese))
[15]龙红兵,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.(LONG Hongbing,LIANG Jianwen,ZHAO Fengxin.Dynamic responses of a multilayered site with saturated soils[J].Rock and Soil Mechanics,2008,29(3):679-684.(in Chinese))
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