【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。更多还原

【Abstract】 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.更多还原