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摘要：
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为探究随机波作用下沉入式大圆筒结构的失稳破坏机理 ,文章进行了不同波浪条件下的随机波水槽实验并测取了结构表面的动土压力时程 ,通过在时域和频域的综合分析并结合结构的实际失稳状态 ,文章对沉入式大圆筒结构的失稳破坏机理进行了探索和阐释。研究表明 ,必须充分重视随机波作用下地基土动力特性的演变 ,结构的振动响应导致地基土强度软化以及不可逆塑性变形的发展 ,以致在波浪的持续作用下使结构发生倾斜并最终倾倒 ,是随机波作用下沉入式大圆筒结构失稳破坏的主要原因
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In order to investigate the mechanism of instability and failure of the deeply embedded large cylindrical structure under random waves, wave flume experiments with different wave conditions were carried out and the corresponding dynamic earth pressures on the structure were measured. By analyzing the experimental data both in the time and frequency domains and surveying the real state of structural instability, the mechanism of instability and failure of this type of structure is explored and interpreted in the paper. The present study demonstrates that dynamic change of material properties of foundation soil under random waves needs to be paid much attention in the mechanism analysis. The development of soften of mechanical strengths and inreversible plastic deformations of soil, which are induced by structural vibrations, can force the structure inclined, and this might lead the structure gradually to overturn due to long and continuous actions of random waves.
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基金项目：
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国家自然科学基金资助项目 (5 990 90 0 5 )
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作者简介：
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参考文献：
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