摘要
设计实现了液化土–结构相互作用的振动台试验,试验包括地震波输入大型振动台试验和正弦波输入小型振动台试验。试验中建筑物模型和地基土均匀布置,输入单方向水平加速度时程,得到了建筑物对称基底动应力、孔压及建筑物对称顶点的不均匀震陷。研究结果表明:(1)模型对称基底的竖向动应力易呈反对称形式分布;(2)模型基底竖向动压应力对孔压增长有较大贡献;(3)输入波形不对称的地震波能够导致模型对称基底孔压分布不均衡及建筑物不均匀震陷;(4)输入正弦波,模型对称基底动应力及孔压差别不明显,模型将发生均匀震陷。
The shaking table test of soil-structure interaction (SSI) is introduced. It includes the earthquake-wave-input large table tests and sine-wave-input small table tests. The structure and the subsoil are uniformly distributed; and one direction horizontal seismic waves are input. The dynamic stresses and pore pressures at symmetrical places under the structure and the differential settlement at symmetrical vertexes of the structure are achieved. Results show that: (1) the vertical dynamic stress histories are easily taken with the antisymmetrical distribution in the two sides of the symmetrical foundation; (2) the vertical dynamic pressing stresses in the two sides of the symmetrical foundation are very important for increase of pore-pressure; (3) the asymmetry of the seismic waves bring unbalanced distribution and differential settlement; and (4) when inputting sine-wave, the contrasts of dynamic stresses and pore pressures at symmetrical places under the structure are not obvious; and the uniform settlement will happen.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第11期1978-1985,共8页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(59978049)
地震学联合基金资助项目(104137)
关键词
土力学
可液化地基
不均匀震陷
机制研究
振动台试验
Earthquake resistance
Foundations
Pore pressure
Settlement of structures
Soil liquefaction
Soil mechanics
